INSTRUCTION MANUAL
1500W SERIES DC POWER PUPPLYPU SERIES
PU6-200
6V/200A
PU8-180
PU12.5-120 12.5V/120A PU20-76
PU30-50
30V/50A
PU40-38
PU60-25
60V/25A
PU80-19
PU100-15 100V/15A PU150-10
PU300-5
300V/5A
PU600-2.6

B71-0130-10

8V/180A
20V/76A
40V/38A
80V/19A
150V/10A
600V/2.6A

■ About Brands and Trademarks
The company and product names described in this manual are the brands and trademarks owned by the respective
companies or organizations in each country and region.

■ About the Instruction Manual
Permission from the copyright holder is needed to reprint the contents of this manual, in whole or in part. Be awarethat the product specifications and the contents of this manual are subject to change for the purpose of improvement.

CONTENTS
SAFETY INSTRUCTIONS..............................................................................................................Ⅰ～Ⅲ

1. GENERAL INFORMATION _____________________________________________ 1
1-1. Features and options ..................................................................................................................1
1-2. Analog voltage programming and monitoring .............................................................................1
1-3. Control via the serial communication port ...................................................................................1
1-4. Output connections .....................................................................................................................2
1-5. Cooling and mechanical construction .........................................................................................2
1-6. Models covered by this manual ..................................................................................................2

2. PRIOR TO USE ______________________________________________________ 3
2-1. Initial inspection ..........................................................................................................................3
2-2. Accessories ................................................................................................................................3
2-3. Installation ..................................................................................................................................3
2-4. Preparation for use .....................................................................................................................3
2-5. Rack mounting ............................................................................................................................4
2-5-1. To install the Power Supply in a rack: ..................................................................................4
2-6. Location, mounting and cooling ..................................................................................................4
2-7. AC source requirements .............................................................................................................4
2-8. AC input power connection .........................................................................................................4
2-8-1. AC Input Connector .............................................................................................................4
2-8-2. AC Input Cord ......................................................................................................................4
2-8-3. AC Input Wire Connection, 1500W models ..........................................................................5
2-8-4. Time to Heat Beforehand .....................................................................................................5
2-9. Turn-on checkout procedure .......................................................................................................6
2-9-1. Prior to Operation.................................................................................................................6
2-9-2. Constant Voltage Check ......................................................................................................6
2-9-3. Constant Current Check ......................................................................................................6
2-9-4. OVP Check ..........................................................................................................................7
2-9-5. UVL Check ...........................................................................................................................7
2-9-6. Foldback Check ...................................................................................................................7
2-9-7. Address Setting....................................................................................................................7
2-9-8. Baud Rate Setting ................................................................................................................7
2-10. Connecting the load ..................................................................................................................8
2-10-1. Load Wiring ........................................................................................................................8
2-10-2. Current Carrying Capacity .................................................................................................8
2-10-3. Wire termination .................................................................................................................9
2-10-4. Noise and Impedance Effects ............................................................................................9
2-10-5. Inductive loads ...................................................................................................................9
2-10-6. Making the load connections............................................................................................10
2-10-7. Connecting single loads, local sensing (default) ..............................................................12

2-10-8. Connecting single loads, remote sensing ........................................................................12
2-10-9. Connecting multiple loads, radial distribution method ......................................................13
2-10-10. Multiple load connection with distribution terminals .......................................................13
2-10-11. Grounding outputs .........................................................................................................13
2-11. Local and remote sensing .......................................................................................................14
2-11-1. Local sensing ...................................................................................................................14
2-11-2. Remote sensing ...............................................................................................................15
2-11-3. J2 sense connector technical information ........................................................................15

3. PANELS ___________________________________________________________ 16
3-1. Front panel ...............................................................................................................................16
3-1-1. Operation Panel .................................................................................................................16
3-2. Rear panel ................................................................................................................................18
3-3. SW1 setup switch .....................................................................................................................193-3-1. SW1 position functions ......................................................................................................193-3-2. Resetting the SW1 switch ..................................................................................................19
3-4. J1 programming and monitoring connector ..............................................................................20
3-4-1. Making J1 connections ......................................................................................................20

4. LOCAL OPERATION _________________________________________________ 22
4-1. Standard operation ...................................................................................................................22
4-1-1. Constant Voltage Mode .....................................................................................................22
4-1-2. Constant Current Operation ...............................................................................................22
4-1-3. Automatic Crossover..........................................................................................................224-2. Over voltage protection (OVP) ..................................................................................................23
4-2-1. Setting the OVP level .........................................................................................................23
4-2-2. Activated OVP protection indications .................................................................................23
4-2-3. Resetting the OVP circuit ...................................................................................................23
4-3. Under voltage limit (UVL) ..........................................................................................................23
4-3-1. Setting the UVL level .........................................................................................................23
4-4. Foldback protection ..................................................................................................................24
4-4-1. Setting the Foldback protection..........................................................................................24
4-4-2. Resetting activated Foldback protection ............................................................................24
4-5. Output ON/OFF control.............................................................................................................24
4-6. Output shut-off (SO) control via rear panel J1 connector..........................................................25
4-7. Enable/disable control via rear panel J1 connector ..................................................................25
4-8. CV/CC signal ............................................................................................................................26
4-9. PS_OK signal ...........................................................................................................................26
4-10. Safe start and auto-restart modes ..........................................................................................26
4-10-1. Automatic start mode .......................................................................................................26
4-10-2. Safe start mode................................................................................................................26
4-11. Over temperature protection (OTP) ........................................................................................26
4-12. Last setting memory ...............................................................................................................27
4-13. Series operation......................................................................................................................27
4-13-1. Series connection for increased output voltage ...............................................................27

4-13-2. Series connection for positive and negative output voltage .............................................28
4-14. Parallel operation ....................................................................................................................29
4-14-1. Parallel operation (1) ........................................................................................................29
5-14-2. Parallel operation (2) ........................................................................................................30
4-15. Daisy-chain connection...........................................................................................................31
4-16. Front panel locking .................................................................................................................32
4-16-1. Unlocked front panel ........................................................................................................32
4-16-2. Locked front panel ...........................................................................................................32

5. REMOTE ANALOG PROGRAMMING ___________________________________ 33
5-1. LOCAL /REMOTE analog control .............................................................................................33
5-2. LOCAL/REMOTE analog indication ..........................................................................................33
5-3. Remote voltage programming of output voltage and current limit .............................................34
5-4. Resistive programming of output voltage and current limit .......................................................35
5-5. Remote monitoring of output voltage and current .....................................................................36

6. RS232 & RS485 REMOTE CONTROL ___________________________________ 37
6-1. Configuration ............................................................................................................................37
6-1-1. Default setting ....................................................................................................................37
6-1-2. Address setting ..................................................................................................................37
6-1-3. RS232 or RS485 selection .................................................................................................37
6-1-4. Baud rate setting ................................................................................................................37
6-1-5. Setting the unit into Remote or Local mode .......................................................................37
6-1-6. RS232/485 port in Local mode...........................................................................................38
6-1-7. Front panel in Remote mode..............................................................................................38
6-2. RS232/485 connector ...............................................................................................................38
6-3. Connecting power supplies to RS232 or RS485 bus ................................................................38
6-3-1. Single power supply ...........................................................................................................38
6-3-2. Multi power supply connection to RS232 or RS485 bus ....................................................40
6-4. Communication interface protocol ............................................................................................41
6-4-1. Data format ........................................................................................................................41
6-4-2. Addressing .........................................................................................................................41
6-4-3. End of Message .................................................................................................................41
6-4-4. Checksum ..........................................................................................................................41
6-4-5. Acknowledge......................................................................................................................41
6-4-6. Backspace .........................................................................................................................41
6-5. Error messages ........................................................................................................................42
6-6. Command set sescription .........................................................................................................42
6-6-1. Command set categories ...................................................................................................42
6-6-2. Initialization control commands ..........................................................................................43
6-6-3. ID control commands .........................................................................................................43
6-6-4. Output control commands ..................................................................................................43
6-6-5. Global output commands ...................................................................................................44
6-6-6. Status control commands ..................................................................................................45
6-7. Status, error and SRQ registers ...............................................................................................46

6-7-1. Conditional registers ..........................................................................................................47
6-7-2. Service Request: Enable and Event Registers ..................................................................48
6-8. Serial communication test set-up ..............................................................................................49

7. ISOLATED ANALOG PROGRAMMING OPTION___________________________ 50
7-1. Specivivations ...........................................................................................................................50
7-1-1. 0V to 5V/0V to 10V option ..................................................................................................50
7-1-2. 4mA to 20mA option ..........................................................................................................50
7-2. Isolated programming and monitoring ......................................................................................51
7-3. Setup and operating instructions ..............................................................................................52
7-3-1. Setting up the power supply for 0V to 5V/0V to 10V Isolated Programming and Monitoring ..52
7-3-2. Setting up the power supply for 4mA to 20mA Isolated Programming and Monitoring ......52

8. MAINTENANCE _____________________________________________________ 53
8-1. Units under warranty.................................................................................................................53
8-2. Periodic maintenance ...............................................................................................................53
8-3. Adjustments and calibration ......................................................................................................53
8-4. Parts replacement and repairs ..................................................................................................53
8-5. Fuse rating ................................................................................................................................53

APPENDIX A TROUBLESHOOTING ______________________________________ 54
APPENDIX B PU 1500W POWER SUPPLIES OUTLINE DRAWINGS ____________ 55
APPENDIX C SPECIFICATIONS _________________________________________ 56
APPENDIX D ACCESSORIES ___________________________________________ 60

USING THE PRODUCT SAFELY■ Preface
To use the product safely, read instruction manual to the end.
Before using this product, understand how to correctly use it.
If you read the manuals but you do not understand how to use it, ask us or your local dealer.
After you read the manuals, save it so that you can read it anytime as required.

■ Pictorial indication
The manuals and product show the warning and caution items required to safely use the product.
The following pictorial indication and warning character indication are provided.

<Pictorial indication>
Some part of this product or the manuals may show this pictorial indication.
In this case, if the product is incorrectly used in that part, a serious danger may be brought
about on the user's body or the product.
To use the part with this pictorial indication, be sure to refer to the manuals.

If you use the product, ignoring this indication, you may get killed or seriously injured.
This indication shows that the warning item to avoid the danger is provided.

If you incorrectly use the product, ignoring this indication, you may get slightly injured or
the product may be damaged.
This indication shows that the caution item to avoid the danger is provided.

Please be informed that we are not responsible for any damages to the user or to the third person, arising from
malfunctions or other failures due to wrong use of the product or incorrect operation, except such responsibility fordamages as required by law.

IUSING THE PRODUCT SAFELY■ Do not remove the product's covers and panels
Never remove the product's covers and panels for any purpose.
Otherwise, the user's electric shock or fire may be incurred.

■ Warning on using the productWarning items given below are to avoid danger to user's body and life and avoid the damage or deterioration of the
product. Use the product, observing the following warning and caution items.

■ Warning items on power supply● Power supply voltage
The rated power supply voltages of the product are 100, 120, 220 and 240VAC. The rated power supply voltage foreach product should be confirmed by reading the label attached on the back of the product or by the “rated” column
shown in the instruction manual. The specification of power cord attached to the products is rated to 125VAC for
all products which are designed to be used in the areas where commercial power supply voltage is not higher
than 125VAC. Accordingly, you must change the power cord if you want to use the product at the power supply
voltage higher than 125VAC. If you use the product without changing power cord to 250VAC rated one, electric
shock or fire may be caused. When you used the product equipped with power supply voltage switching system,
please refer to the corresponding chapter in the instruction manuals of each product.

● Power cord
(IMPORTANT) The attached power cord set can be used for this device only.
If the attached power cord is damaged, stop using the product and call us or your local dealer.
If the power cord is used without the damage being removed, an electric shock or fire may be caused.

● Protective fuse
If an input protective fuse is blown, the product does not operate. For a product with external fuse holder, the fuse
may be replaced. As for how to replace the fuse, refer to the corresponding chapter in the instruction manual.
If no fuse replacement procedures are indicated, the user is not permitted to replace it. In such case, keep thecase closed and consult us or your local dealer. If the fuse is incorrectly replaced, a fire may occur.

■ Warning item on Grounding
If the product has the GND terminal on the front or rear panel surface, be sure to ground the product to safely use it.

■ Warnings on Installation environment● Operating temperature and humidity
Use the product within the operating temperature indicated in the “rating” temperature column.
If the product is used with the vents of the product blocked or in high ambient temperatures, a fire may occur.
Use the product within the operating humidity indicated in the “rating” humidity column.
Watch out for condensation by a sharp humidity change such as transfer to a room with a different humidity.
Also, do not operate the product with wet hands. Otherwise, an electric shock or fire may occur.

● Use in gas
Use in and around a place where an inflammable or explosive gas or steam is generated or stored may result in an
explosion and fire. Do not operate the product in such an environment.
Also, use in and around a place where a corrosive gas is generated or spreading causes a serious damage to the
product. Do not operate the product in such an environment.

● Installation place
Do not insert metal and inflammable materials into the product from its vent and spill water on it.
Otherwise, electric shock or fire may occur.

IIUSING THE PRODUCT SAFELY■ Do not let foreign matter in
Do not insert metal and inflammable materials into the product from its vent and spill water on it.
Otherwise, electric shock or fire may occur.

■ Warning item on abnormality while in use
If smoke or fire is generated from the product while in use, stop using the product, turn off the switch, and remove thepower cord plug from the outlet. After confirming that no other devices catch fire, ask us or your local dealer.

■ Input / Output terminals
Maximum input to terminal is specified to prevent the product from being damaged.
Do not supply input, exceeding the specifications that are indicated in the "Rating" column in the instruction manual of
the product. Also, do not supply power to the output terminals from the outside.
Otherwise, a product failure is caused.

■ Calibration
Although the performance and specifications of the product are checked under strict quality control during shipmentfrom the factory, they may be deviated more or less by deterioration of parts due to their aging or others.
It is recommended to periodically calibrate the product so that it is used with its performance and specifications stable.
For consultation about the product calibration, ask us or your local dealer.

■ Daily Maintenance
When you clean off the dirt of the product covers, panels, and knobs, avoid solvents such as thinner and benzene.
Otherwise, the paint may peel off or resin surface may be affected. To wipe off the covers, panels, and knobs, use asoft cloth with neutral detergent in it.
During cleaning, be careful that water, detergents, or other foreign matters do not get into the product.
If a liquid or metal gets into the product, an electric shock and fire are caused.
During cleaning, remove the power cord plug from the outlet.
Use the product correctly and safely, observing the above warning and caution items.
Because the instruction manual indicates caution items even in individual items, observe those caution items to correctly
use the product.
If you have questions or comments about the manuals, ask us or E-Mail us.

III1. GENERAL INFORMATIONThis user’s manual contains the operating instructions, installation instructions and specifications of the PU 1500W
power supply series. The instructions refer to the standard power supplies, including the built-in RS232/485 serial
communication. For information related to operation with the optional GP-IB programming.
◆ Refer to Instruction Manual for “Power Supply GP-IB programming Interface”.
PU power supplies are wide output range, high performance switching power supplies. The PU series is power factor
corrected and operates from worldwide AC voltage range continuously. Output voltage and current are continuously
displayed and LED indicators show the complete operating status of the power supply. The Front panel controls
allow the user to set the output parameters, the protection levels (Over-Voltage protection, Under-Voltage limit andFoldback) and preview the settings. The rear panel includes the necessary connectors to control and monitor the
power supply operation by remote analog signals or by the built-in serial communication (RS232/485).
GP-IB programming and Isolated-Analog programming/monitoring are optional.

1-1. Features and options- Constant Voltage / Constant Current with automatic crossover.
- Active Power Factor correction.
- Universal Input Voltage 85Vac to 265Vac, continuous operation.
- Embedded Microprocessor Controller.
- Built in RS232/485 Interface.
- Voltage & Current high resolution adjustment by digital encoders.
- High accuracy programming/readback-16 bit.
- Software Calibration (no internal trimmers / potentiometers).
- Last Setting Memory.
- Independent Remote ON/OFF (opt-isolated) and Remote Enable/Disable.
- Parallel operation (Master/Slave) with Active current sharing.
- Remote sensing to compensate for voltage drop of power leads.
- Cooling fan speed control for low noise and extended fan life.
- Zero stacking- no ventilation holes at the top and bottom surface of the power supply.
- Optional GP-IB interface (SCPI compatible).
- Optional Isolated Analog programming/monitoring (0V to 5V or 0V to 10V, user selectable and 4mA to 20mA).
- The PU power supplies series can be configured into a programmable power system of up to 31 units using thebuilt-in RS232/RS485 communication port in the power supply and the RS485 linking cable provided with eachpower supply.
- In a GP-IB system, each power supply can be controlled using the optional GP-IB controller (factory installed).
- The PU power supplies of the same output voltage and current rating can be paralleled in master-slave configuration
with automatic current sharing to increase power available.

1-2. Analog voltage programming and monitoring
Analog inputs and outputs are provided at the rear panel for analog control of the power supply. The output voltage
and the current limit can be programmed by analog voltage or by resistor, and can be monitored by analog voltage.
The power supply output can be remotely set to On or Off and analog signals monitor the proper operation of thepower supply and the mode of operation (CV/CC).

1-3. Control via the serial communication port
The following parameters can be programmed via the serial communication port:- Output voltage setting.
- Output current setting.
- Output voltage measurement.
- Output current measurement- Output on/off control.
- Foldback protection setting.
- Over-voltage protection setting and readback.
- Under-Voltage limit setting and readback.
- Power-supply start up mode (last setting or safe mode)1

1-4. Output connections
Output connections are made to rear panel bus-bars for models up to 60V and to a 4-terminal wire clamp connector formodels above 60V rated output voltage. Either the positive or negative terminal may be grounded or the output may
be floated. Models up to 60VDC Rated Output shall not float outputs more than ±60VDC above/below chassis
ground. Models >60VDC Rated Output shall not float outputs more than ±600VDC above/below chassis ground.
Contact factory for assistance with higher float voltage applications.
Local or remote sense may be used. In remote sense, the voltage drop on the load wires should be minimized.
◆ Refer to the "APPENDIX C SPECIFICATIONS" for the maximum voltage drop value.

1-5. Cooling and mechanical construction
The PU series is cooled by internal fans. At the installation, care must be taken to allow free air flow into the power
supply via the front panel and out of the power supply via the rear panel. The PU power supplies have a compact andlightweight package which allows easy installation and space saving in the application equipment.

Observe all torque guidelines within this manual. Over torque may damage unit oraccessories. Such damage is not covered under manufacturers warranty.

1-6. Models covered by this manual
Table1-1: Models covered by the manual
Model

Voltage range (V)Current range (A)ModelVoltage range (V)Current range (A)PU6-200

0 to 60 to 200

PU60-25

0 to 60

0 to 25

PU8-180

0 to 80 to 180

PU80-19

0 to 80

0 to 19

PU12.5-120

0 to 12.5

0 to 120

PU100-15

0 to 100

0 to 15

PU20-76

0 to 20

0 to 76

PU150-10

0 to 150

0 to 10

PU30-50

0 to 30

0 to 50

PU300-5

0 to 300

0 to 5

PU40-38

0 to 40

0 to 38

PU600-2.6

0 to 600

0 to 2.6

2

2. PRIOR TO USE
2-1. Initial inspection
Prior to shipment this power supply was inspected and found free of mechanical or electrical defects.
Upon unpacking of the power supply, inspect for any damage which may have occurred in transit.
The inspection should confirm that there is no exterior damage to the power supply such as broken knobs orconnectors and that the front panel and meters face are not scratched or cracked. Keep all packing material until theinspection has been completed. If damage is detected, file a claim with carrier immediately and notify our sales orservice facility nearest you.

2-2. Accessories
Make sure the accessories are attached correctly.
branches. Accessories vary by model.
◆ Refer to the "APPENDIX D ACCESSORIES".

If there are any problems, please contact one of our sales

2-3. Installation
This section contains instructions for initial inspection, preparation for use and repackaging for shipment.
◆ Connection to PC, setting the communication port and linking PU power supplies are described in"6. RS232 & RS485 REMOTE CONTROL".
PU power supplies generate magnetic fields, which might affect the operation of other instruments.
if your equipment is susceptible to magnetic fields, do not position it a adjacent to the power supply.

2-4. Preparation for use
In order to be operational the power supply must be connected to an appropriate AC source. The AC source voltage
should be within the power supply specification.
◆ Do not apply power before reading, "2-7. AC source requirements" and "2-8. AC input power connection".
Table 2-1 below, describes the basic setup procedure. Follow the instructions in Table 2-1 in the sequence given to
prepare the power supply for use.

Step no.
1

Item
Inspection

2

Installation

3

AC source

4

Test

5

Load connection

6

Default setting

Table 2-1: Basic setup procedure
Description
Initial physical inspection of the power supply
Installing the power supply,
Ensuring adequate ventilation.
AC source requirements
Connecting the power supply to the AC source.
Turn-on checkout procedure.
Wire size selection. Local /Remote sensing.
Single or multiple loads.
The power supply setting at shipment.

3

Reference
2-1. Initial inspection
2-5. Rack mounting
2-6. Location, mounting and cooling
2-7. AC source requirements
2-8. AC input power connection
2-9. Turn-on checkout procedure
2-10-6. Making the load connections
6-1-1. Default setting

2-5. Rack mounting
The PU power supply series is designed to fit in a standard 19” equipment rack.

2-5-1. To install the Power Supply in a rack:
1. Use the front panel rack-mount brackets to install the power supply in the rack.
2. Use a support bar to provide adequate support for the rear of the power supply.
Do not obstruct the air exhaust at the rear panel of the unit.
Please install the support angle when you store it in the rack because it is a heavy load.

2-6. Location, mounting and coolingThis power supply is fan cooled. The air intake is at the front panel and the exhaust is at the rear panel.
Upon installation allow cooling air to reach the front panel ventilation inlets. Allow minimum 15cm of unrestricted air
space at the front and the rear of the unit.
The power supply should be used in an area that the ambient temperature does not exceed +50 C.

2-7. AC source requirements
The PU series can be operated from a nominal 100V to 240V, single phase, 47Hz to 63Hz.
◆ The input voltage range and current required for each model is specified in “APPENDIX C SPECIFICATIONS”.
◆ Ensure that under heavy load, the AC voltage supplied to the power supply does not fall below the specifications
described in “APPENDIX C SPECIFICATIONS”.

2-8. AC input power connection
Connection of this power supply to an AC power source should be made by anelectrician or other qualified personnel.
There is a potential shock hazard if the power supply chassis (with cover in place) is
not connected to an electrical safety ground via the safety ground in the AC input
connector.
Some components inside the power supply are at AC voltage even when the On/Off
switch is in the “Off” position. To avoid electric shock hazard, disconnect the line
cord and load and wait two minutes before removing cover.

2-8-1. AC Input Connector
The AC input connector is a 3-Terminal wire clamp located on the rear panel. Use suitable wires and tightening
torque as follows:
1. Wire diameter: 12AWG or 10AWG.
2. Tightening torque: 0.5Nm to 0.6Nm ( 5.1kgf・cm to 6.1kgf・cm)

2-8-2. AC Input Cord
The AC input cord is the disconnect device of the power supply. The plug must be
readily identifiable and accessible to the user. The AC input cord must be no longer
than 3m.

4

2-8-3. AC Input Wire Connection, 1500W models
1. Strip the outside insulation of the AC cable approx. 10cm. Trim the wires so that the ground wire is 10mmlonger
than the other wires. Strip14mmat the end of each of the wires.
2. Unscrew the base of the strain relief from the helix-shaped body. Insert the base through the outside opening in
the AC input cover and screw the locknut securely (1.2Nm to 1.6 Nm / 12.7kgf.cm to 16.1kgf・cm) into the base, fromthe inside.
3. Slide the helix-shaped body onto the AC cable. Insert the stripped wires through the strain relief base until theouter cable jacket is flush with the edge of the base. Tighten (1.8Nm to 2.0 Nm / 18.4kgf to 0.7 kgf・cm) the body tothe base while holding the cable in place. Now the cable is securely fastened inside the strain relief.
Refer to Fig.2-1.

Fig. 2-1: Stripped wires installed in strain relief
4. Route the AC wires to the input connector terminals as required. To connect the wires, loosen the terminal screw,
insert the stripped wire into the terminal and tighten the screw securely ( 0.5Nm to 0.6Nm / 5.1kgf.cm to 6.1kgf・cm ).
5. Route the wires inside the cover to prevent pinching. Fasten the cover to the unit using the M3x8 Flat Head screws
are provided.
◆ Refer to Fig.2-2 for details.

Fig. 2-2 AC input cover and strain relief, 1500W models

2-8-4. Time to Heat Beforehand
In order to obtain the performance of regulation of this machine, please carry out aging 30 minutes or more.

52-9. Turn-on checkout procedure
The following procedure ensures that the power supply is operational and may be used as a basic incoming inspection
check. Refer to Fig.3-2 and Fig.3-3 for the location of the controls indicated in the procedure.

2-9-1. Prior to Operation
1. Ensure that the power supply is configured to the default setting:- AC On/Off switch at Off position.
- Dip switch: All positions at Down (”Off”) position.
- Sense connector: Configured to Local Sense as shown in Fig.2-3:
Plug P/N: MC 1.5/5-ST-3.81 (Phoenix)

1
2
3
4
5

Remote (+) sense
Local (+) sense
Not connected
Local (-) sense
Local (-) sense

+S
+LS
-LS
-S

Fig.2-3: Sense connector default connection- For units equipped with GP-IB option, ensure that the GP-IB_En switch is in Up (default) position, if checkout is tobe done in GP-IB mode.
2. Connect the unit to an AC source.
3. Connect a DVM with appropriate cables for the rated voltage to the output terminals.
4. Turn the front panel AC power switch to On.

2-9-2. Constant Voltage Check
1. Turn on the output by pressing OUTPUT pushbutton so the OUTPUT LED illuminates.
2. Observe the power supply VOLT display and rotate the Voltage encoder. Ensure that the output voltage varies
while the VOLT encoder is rotated. The minimum control range is from zero to the maximum rated output for the
power supply model. Compare the DVM reading with the front panel VOLT display to verify the accuracy of the
VOLT display. Ensure that the front panel CV LED is on.
3. Turn off the front panel AC power switch.

2-9-3. Constant Current Check
1. Ensure that the front panel AC power switch is at Off position and the DVM connected to the output terminals shows
zero voltage.
2. Connect a DC shunt across the output terminals. Ensure that the shunt and the wires' current ratings are higher
than the power supply rating. Connect a DVM to the shunt.
3. Turn the front panel AC power switch to on position.
4. Turn on the output by pressing OUTPUT pushbutton so the OUTPUT LED illuminates.
5. Observe the power supply CURRENT display and rotate the CURRENT encoder. Ensure that the output current
varies while the CURRENT encoder is rotated. The minimum control range is from zero to the maximum rated
output for the power supply model.
6. Compare the DVM reading with the front panel CURRENT display to verify the accuracy of the CURRENT display.
Ensure that the front panel CC LED is on.
7. Turn off the front panel AC power switch.
8. Remove the shunt from the power supply output terminals.

62-9-4. OVP Check◆ Refer to "4-2. Over voltage protection (OVP)".
1. Turn the front panel AC power switch to On position and turn on the output by pressing OUTPUT pushbutton.
2. Using the VOLT encoder, adjust the output voltage to approx.10% of the unit voltage rating.
3. Momentarily press the OVP/UVL button so that the CURRENT display shows “OUP”. The VOLTAGE display
will show the last setting of the OVP level.
4. Rotate the VOLT encoder CCW to adjust the OVP setting to 50% of the unit voltage rating.
5. Wait a few seconds until the VOLT display returns to show the output voltage.
6. Adjust the output voltage toward it’s maximum and check that the output voltage cannot be increased more thanthe OVP setting.
7. Adjust OVP limit to the maximum by repeating step 3 and rotating the VOLT encoder CW.

2-9-5. UVL Check◆ Refer to "4-3. Under voltage limit (UVL)".
1. Press the OVP/UVL button TWICE so that the CURRENT display shows "UUL". The VOLTAGE display willshow the last setting of the UVL level.
2. Rotate the VOLT encoder to adjust the UVL level to approx.10% of the unit voltage rating.
3. Wait a few seconds until the VOLT display returns to show the output voltage.
4. Adjust the output voltage toward it’s minimum and check that the output voltage cannot be decreased below theUVL setting.
5. Adjust the UVL limit to the minimum by repeating step1 and rotating the VOLT encoder CCW.

2-9-6. Foldback Check
Shorting the output may expose the user to hazardous voltages.
safety procedures.

Observe proper◆ Refer to "4-4. Foldback protection".
1. Ensure that the output voltage is set to approx. 10% of the unit rating.
2. Adjust the CURRENT encoder to set the current limit to approx. 10% of the unit rating.
3. Momentarily press the FOLD button. Ensure that the FOLD LED illuminates. The output voltage remains
unchanged.
4. Short the output terminals momentarily (approx. 0.5 sec.). Ensure that the output voltage falls to zero, theVOLT display shows “Fb” and the ALARM LED blinks.
5. Press the FOLD button again to cancel the protection. The output voltage remains zero.
6. Press OUTPUT button. Ensure that the output voltage returns to it’s last setting.
7. Turn the output off by pressing OUTPUT button. Ensure that the VOLT display shows “OFF”.

2-9-7. Address Setting
1. Press and hold the RMT/LCL button for approx. 3sec. The VOLT display will show the communication port address.
2. Using the VOLT adjust encoder, check that the address can be set within the range of 0 to 30.

2-9-8. Baud Rate Setting
1. Press and hold the RMT/LCL button for approx. 3sec. The CURRENT display will show the communication port
Baud Rate.
2. Using The CURRENT adjust encoder, check that the Baud Rate can be set to 1200, 2400, 4800, 9600 and 19200.

7

2-10. Connecting the load
Turn off the AC input power before making or changing any rear panel connection.
Ensure that all connections are securely tightened before applying power. There is apotential shock hazard when using a power supply with a rated output greater than 40V.

2-10-1. Load Wiring
The following considerations should be made to select wiring for connecting the load to the power supply:- Current carrying capacity of the wire.
◆ Refer to "2-10-2. Current Carrying Capacity".
- Insulation rating of the wire should be at least equivalent to the maximum output voltage of the power supply.
- Maximum wire length and voltage drop.
◆ Refer to "2-10-2. Current Carrying Capacity".
- Noise and impedance effects of the load wiring.
◆ Refer to "2-10-4. Noise and Impedance Effects".

2-10-2. Current Carrying Capacity
Two factors must be considered when selecting the wire size:
1. Wires should be heavy enough not to overheat while carrying the power supply load current at the rated load, orthe current that would flow in the event the load wires were shorted, whichever is greater.
2. Wire size should be selected to enable voltage drop per lead to be less than 1.0V at the rated current. Althoughunits will compensate for up to 5V in each load wire, it is recommended to minimize the voltage drop (1V typicalmaximum) to prevent excessive output power consumption from the power supply and poor dynamic response toload changes.
◆ Please refer to Tables 2-2 and 2-3 for maximum wire length to limit voltage drop in American and European
dimensions respectively.

Wire size AWG
14
12
10
8
6
4
2
0

Cross sect. Area
(mm2)
2.5
4
6
10
16
25
35

Table 2-2: Maximum wire length for 1V drop on lead (in AWG)
Maximum length in meters to limit
Resistivity
voltage drop to 1V or less
Ω/km
5A
10A
20A
50A
8.287
24.4
12.2
6.1
2.4
5.213
36.6
18.3
9.1
3.7
3.2789
61.0
30.5
15.2
6.1
2.0620
97.6
48.8
24.4
9.8
1.2969
152.4
76.2
38.1
15.2
0.8156
243.8
121.9
61.0
24.4
0.5131
365.8
182.9
91.4
41.1
0.3225
609.6
304.8
152.4
61.0

150A
0.8
1.2
2.0
3.3
5.1
8.1
13.7
20.3

Table 2-3: Maximum wire length for 1V drop on lead (in mm2)
Maximum length in meters to limit
Resistivity
voltage drop to 1V or less
Ω/km
5A
10A
20A
50A

150A

8.21
5.09
3.39
1.95
1.24
0.795
0.565

24.0
39.2
59.0
102.6
160.0
250.0
354.0

12.0
18.6
29.4
51.2
80.0
125.0
177.0

6.0
9.8
14.8
25.6
40.0
62.0
88.0

2.4
4.0
5.8
10.2
16.0
25.2
35.4

For currents not shown in Table 2-2 and 2-3, use the formula:
Maximum length=1000/ (current x resistively)
Where current is expressed in Amperes and resistively in ohms/km or ohms/1000ft.

8

0.8
1.4
2.0
3.4
5.4
8.4
11.8

2-10-3. Wire termination
The wires should be properly terminated with terminals securely attached.
connection at the power supply.

DO not use unterminated wires for load

When local sensing, a short from +LS or +S to -V or -S or -LS, will cause damage tothe power supply. Reversing the sense wires might cause damage to the power
supply in local and remote sensing. (Do not connect -S to +V or +S to -V.)

2-10-4. Noise and Impedance Effects
To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted pairs to theshortest possible length. Shielding of sense leads may be necessary in high noise environments. Where shielding
is used, connect the shield to the chassis via a rear panel Ground screw. Even if noise is not a concern, the load andremote sense wires should be twisted-pairs to reduce coupling, which might impact the stability of power supply.
The sense leads should be separated from the power leads. Twisting the load wires reduces the parasitic inductanceof the cable which could produce high frequency voltage spikes at the load and the output of power supply, because ofcurrent variation in the load itself. The impedance introduced between the power supply output and the load could
make the ripple and noise at the load worse than the noise at the power supply rear panel output. Additional filteringwith bypass capacitors at the load terminals may be required to bypass the high frequency load current.

2-10-5. Inductive loads
Inductive loads can produce voltage spikes that may be harmful to the power supply. A diode should be connectedacross the output. The diode voltage and current rating should be greater than the power supply maximum output
voltage and current rating. Connect the cathode to the positive output and the anode to the negative output of thepower supply. Where positive load transients such as back EMF from a motor may occur, connect a surge
suppressor across the output to protect the power supply. The breakdown voltage rating of the suppressor must be
approximately 10% higher than the maximum output voltage of the power supply.

92-10-6. Making the load connections
Hazardous voltages exist at the outputs and the load connections when using a power
supply with a rated output greater than 40V. To protect personnel against accidental
contact with hazardous voltages, ensure that the load and its connections have noaccessible live parts. Ensure that the load wiring insulation rating is greater than orequal to the maximum output voltage of the power supply.

Ensure that the load wiring mounting hardware does not short the output terminals.
Heavy connecting cables must have some form of strain relief to prevent loosening theconnections or bending the bus-bars.

6V to 60V Models◆ Refer to Fig.2-4 for connection of the load wires to the power supply bus-bars and to Fig.2-5 for mounting thebus-bars shield to the chassis.

Fig. 2-4: Load wires connection, 6V to 60V models.

※ Protect cover is only 60V model.
Fig. 2-5: Bus-bars shield and protective cover mounting

1080V to 600V Models
Hazardous voltages exist at the outputs and the load connections. To protect
personnel against accidental contact with hazardous voltages, ensure that the load
and its connections have no accessible live parts.
Ensure that the load wiring insulation rating is greater than or equal to the maximum
output voltage of the power supply.
The 80V to 600V models have a four terminal wire clamp output connector. The two left terminals are the positive
outputs and the other two right terminals are the negative outputs. The connector requirements are as follows:- Wires: AWG18 to AWG10.
- Tightening torque: 0.5Nm to 0.6Nm ( 5.1kgf.cm to 6.1kgf・cm ).
Follow the below instructions for connection of the load wires to the power supply:
1. Strip approx.10mm at the end of each of the wires.
2. Loosen the mating connector terminal screws.
3. Insert the stripped wires into the terminal and tighten the terminal screw securely.
◆ Refer to Fig.2-6.

Fig.2-6: Load wires connection to the output terminal
4. Loosen the chassis screw marked “A” halfway as shown in Fig.2-7.
5. Assemble the protective shield to the chassis and tighten the two screws to fix the shield to the chassis
Screws tightening torque: 0.49Nm to 0.59Nm ( 5.0kgf.cm to 6.0kgf・cm )◆ Refer to Fig.2-7.

Fig.2-7: Mounting for Output protect cover11

2-10-7. Connecting single loads, local sensing (default)
Fig.2-9 shows recommended load and sensing connections for a single load. The local sense lines shown are default
connections at the rear panel J2 sense connector. Local sensing is suitable for applications where load regulation isless critical.

Fig.2-9: Single load connection, local sensing

2-10-8. Connecting single loads, remote sensing
Fig.2-10 shows recommended remote sensing connection for single loads.
Remote sensing is used when, in Constant Voltage mode, the load regulation is important at the load terminals.
Use twisted or shielded wires to minimize noise pick-up. If shielded wires are used, the shield should be connected to
the ground at one point, either at the power supply chassis or the load ground. The optimal point for the shield groundshould be determined by experimentation.

Fig.2-10: Remote sensing, single load

12

2-10-9. Connecting multiple loads, radial distribution method
Fig.2-11 shows multiple loads connected to one supply. Each load should be connected to the power supply’s output
terminals using separate pairs of wires. It is recommended that each pair of wires will be as short as possible andtwisted or shielded to minimize noise pick-up and radiation.
The sense wires should be connected to the power supply output terminals or to the load with the most critical load
regulation requirement.

Fig.2-11: Multiple loads connection, radial distribution, local sense

2-10-10. Multiple load connection with distribution terminals
If remotely located output distribution terminals are used, the power supply output terminals should be connected tothe distribution terminals by a pair of twisted and/or shielded wires. Each load should be separately connected to theremote distribution terminals (see Fig.2-12). If remote sensing is required, the sensing wires should be connected tothe distribution terminals or at the most critical load.

＋V
Power supply－V

Distribution terminal
＋V

＋
－
＋

- Remote sensing- Local sensing+ Local sensing+ Remote sensing

－
－V

＋
－

Load 1

Load 2

Load 3

Fig.2-12: Multiple loads connection with distribution terminal

2-10-11. Grounding outputs
Either the positive or negative output terminals can be grounded. To avoid noise problems caused by common-mode
current flowing from the load to ground, it is recommended to ground the output terminal as close as possible to thepower supply chassis ground. Always use two wires to connect the load to the power supply regardless of how thesystem is grounded.

Models up to 60VDC Rated Output shall not float outputs more than ±60VDC
above/below chassis ground. Models > 60VDC Rated Output shall not float outputs
more than ±600VDC above/below chassis ground.

OUTPUT TERMINAL GROUNDING
There is a potential shock hazard at the RS232/485 and the GP-IB ports when using
power supplies with rated or combined voltage greater than 400V with the Positive
Output of the power supplies is grounded. Do not connect the Positive Output toground when using the RS232/485 or GP-IB under the above conditions.

13

2-11. Local and remote sensing
The rear panel J2 sense connector is used to configure the power supply for local or remote sensing of the output
voltage.
◆ Refer to Fig.2-13 for sense connector location.

Fig.2-13: Sense connector location
There is a potential shock hazard at the sense connector when using a power supply
with a rated output voltage greater than 40V. Local sense and remote sense wires
should have a minimum insulation rating equivalent or greater than the maximum
output voltage of the power supply. Ensure that the connections at the load end areshielded to prevent accidental contact with hazardous voltages.

2-11-1. Local sensing
The power supply is shipped with the rear panel J2 sense connector wired for local sensing of the output voltage.
See Table 2-4 for J2 terminals assignment. With local sensing , the output voltage regulation is made at the output
terminals. This method does not compensate for voltage drop on the load wires, therefore it is recommended only forlow load current applications or where the load regulation is less critical.

Table 2-4: For J2 terminals assignmen
Terminal

Marks

J2-1

+S

Remote positive sense.

Function

J2-2

+LS

Local positive sense. Connected internally to the positive output terminal.

J2-3

NC

Not connected.

J2-4

-LS

Local negative sense. Connected internally to the negative output terminal.

J2-5

-S

Remote negative sense.

14

2-11-2. Remote sensing
There is a potential shock hazard at the sense point when using power supply with a
rated output voltage greater than 40V. Ensure that the connections at the load end
are shielded to prevent accidental contact with hazardous voltages.

When using shielded sense wires, ground the shield in one place only.
The location can be the power supply chassis or one of the output terminals

Use remote sense where the load regulation at the load end is critical. In remote sense, the power supply willcompensate for voltage drop on the load wires.
◆ Refer to "APPENDIX C SPECIFICATIONS" for the maximum voltage drop on load wires.
The voltage drop is subtracted from the total voltage available at the output. Follow the instructions below to configure
the power supply for remote sensing:
1. Ensure that the AC On/Off is in the Off position.
2. Remove the local sense jumpers from J2.
3. Connect the negative sense lead to terminal J2-5 (-S) and the positive sense lead to terminal J2-1(+S) of theJ2 mating connector. Ensure that the J2 mating connector is plugged securely into the rear panel senseconnector, J2.
4. Turn On the power supply.
1. If the power supply is operating in remote sense and either the positive or negative
load wire is not connected, an internal protection circuit will activate and shut
down the power supply. To resume operation, turn the AC On/Off to the Off
position, connect the open load wire, and turn On the power supply.
2. If the power supply is operated without the remote sense lines or local sense
jumpers, it will continue to work, but the output voltage regulation will be degraded.
Also, the OVP circuit may activate and shut down the power supply.

2-11-3. J2 sense connector technical information- J2 connector type- Plug type
- Wire AWG- Stripping length- Tightening torque:MC1.5/5-G-3.81, Phoenix.
:MC1.5/5-ST-3.81, Phoenix.
: 28 up to 16.
: 7mm.
: 0.22Nm to 0.25Nm ( 2.2kgf.cm to 2.6kgf・cm )15

3. PANELS
3-1. Front panel(PU20-76 model)
Fig.3-1: Front panel

3-1-1. Operation Panel(PU20-76 model)
Fig.3-2: Operation panel
1. AC power switch- AC On/Off control.
2. VOLTAGE control- High resolution rotary encoder for adjusting the Output Voltage. Also adjusts the OVP/UVL levels and selects the Address.
◆ Refer to "4-1-1. Constant Voltage Mode", "4-2-1. Setting the OVP level", "4-3-1. Setting the UVL level","6-1-2. Address setting".
3. CV indicator- Green LED, lights for Constant-Voltage mode operation.
4. VOLTAGE display- 4 digits, 7-segment LED display, Normally displays the output voltage. When the V/I CHK button is pressed, thedisplay indicates the programmed setting of the output voltage. When the OVP/UVL button is pressed, the Voltage
display indicates the OVP/UVL setting.
5. CURRENT display- 4 digits, 7-segment LED display, Normally displays the output current. When the V/I CHK button is pressed, thedisplay indicates the programmed setting of output current.
6. CC indicator- Green LED, lights for Constant-Current mode operation.
7. CURRENT control- High resolution rotary encoder for adjusting the Output current. Also selects the Baud-Rate of the communication port.
◆ Refer to "4-1-2. Constant Current Operation", "6-1-4. Baud rate setting".
8. OUTPUT indicator- Green LED, lights when the DC output is enabled.
9. RMT/LCL indicator- Green LED, lights when the unit is in Remote mode.

16

10. FOLD indicator- Green LED, lights when Foldback protection is On.
11. V/I CHK indicator- Green LED, lights when V/I CHK button is pressed.
12. FINE indicator- Green LED, lights when the unit is in Fine mode.
13. ALARM indicator- Red LED, blinks in case of fault detection. OVP, OTP Foldback, Enable and AC fail detection will cause the ALARM
LED to blink.
14. OUTPUT button- Main function:
Output ON/OFF control.
Press OUTPUT to set the output On or OFF. Press to reset and turn On the output after OVP or FOLD alarm events
have occurred.
◆ Refer to "4-5. Output ON/OFF control".
- Auxiliary function:
Selects between “Safe-Start” and” Auto-Restart” modes. Press and hold OUTPUT button to toggle between“Safe-Start” and “Auto-Restart”. The VOLT display will cycle between “SAF” and “AUT”. Releasing the OUTPUT
button while one of the modes is displayed, selects that mode.
◆ Refer to "4-10. Safe start and auto-restart modes".
15. RMT/LCL button- Main function:
Go to local. Press RMT/LCL to put the unit into Local (RMT/LCL button is disabled at Local Lockout mode).
◆ Refer to "6-1-5. Setting the unit into Remote or Local mode".
- Auxiliary function:
Address and Baud Rate setting. Press and hold RMT/LCL for 3sec. To set the Address with the VOLTAGE encoder
and the Baud Rate with the CURRENT encoder.
◆ Refer to "6-1-2. Address setting", "6-1-4. Baud rate setting".
16. FOLD button- Foldback protection control.
- Press FOLD to set Foldback protection to On.
To release Foldback alarm event, press OUT to enable the output and re-arm the protection. Press FOLD again tocancel the Foldback protection.
◆ Refer to "4-4. Foldback protection".
17. OVP/UVL button- Over Voltage Protection and Under Voltage limit setting.
Press once to set OVP using VOLTAGE encoder (the current display shows “OUP”). Press again to set the UVL
using VOLTAGE encoder (the current display shows “UUL”).
◆ Refer to "4-2. Over voltage protection (OVP)", "4-3. Under voltage limit (UVL)".
18. V/I CHK button- Main function:
Press V/I CHK to display the output voltage and current limit setting. For 5 sec. The display will show the setting
and than it will return to show the actual output voltage and current.
◆ Refer to "4-16. Front panel locking".
- Auxiliary function:
Front Panel Lock. Press and hold V/I CHK button to toggle between “Locked from panel” and “Unlocked front panel”.
The display will cycle between “LFP” and “UFP”. Releasing the V/I CHK button while one of the modes is displayed, selectsthat mode.
◆ Refer to "4-16. Front panel locking".
19. FINE button- Voltage and Current Fine/Coarse adjustment control. Operates as a toggle switch. In Fine mode, the VOLTAGE
and CURRENT encoders operate with high resolution and in Coarse mode with lower resolution (approx. 6 turns).

17

3-2. Rear panel(PU20-76 Model)
Fig.3-3: Rear panel
20. AC input connector- Wire clamp connector◆ Refer to "2-8-1. AC Input Connector".

6V to 60V output model 80V to 600V output model＋V

21. DC output- Bus-bars for 6V to 60V models.
- Wire clamp connector for 80V to 600V models.
◆ Refer to "2-10-6. Making the load connections".

DC OUTPUT－V

22. Remote-In connector- RJ-45 type connector, use for connecting power supplies to RS232 or RS485 port of computer for remote control
purposes. When using several power supplies in a power system, the first unit Remote-In is connected to thecomputer and the remaining units are chained, Remote-In to Remote-Out.
◆ Refer to "6-2. RS232/485 connector", "6-3. Connecting power supplies to RS232 or RS485 bus".
23. Remote Out connector- RJ-45 type connector, used for chaining power supplies to form a serial communication bus.
◆ Refer to "6-2. RS232/485 connector", "6-3. Connecting power supplies to RS232 or RS485 bus".
24. Programming and Monitoring connector- Connector for remote analog interface. Includes output voltage and current limit programming and monitoring signals,
Shut-off control (electrical signal), Enable/Disable control (dry-contact), power supply ok (PS_OK) signal and operation
mode (CV/CC) signal.
◆ Refer to "3-4. J1 programming and monitoring connector".
25. SW1 Setup switch- Nine position DIP switch for selecting remote programming and monitoring modes for Output Voltage, Current Limit
and other control functions.
◆ Refer to "3-3. SW1 setup switch", "3-3-1. SW1 position functions", "3-3-2. Resetting the SW1 switch".
26. Remote sense connector- Connector for making remote sensing connections to the load for regulation of the load voltage and compensation ofload wire drop.
◆ Refer to "2-9-1. Prior to Operation", "2-11-1. Local sensing", "2-11-2. Remote sensing".
27. GP-IB switch- Two position DIP switch for selecting GP-IB mode or RS232/485 mode when GP-IB option is installed.
28. Blank Sub-plate- Blank sub-plate for standard units. Isolated Remote Analog programming connector for unit equipped with Isolated
Analog control option. GP-IB connector for units equipped with GP-IB programming option.
29. Ground screw- M4 x 8 screw for chassis ground connection.

18

3-3. SW1 setup switch
The SW1 Setup switch (see Fig.3-4) is a 9-position DIP switch that allows the user to choose the following:- Internal or remote programming for Output Voltage and Current Limit.
- Remote voltage or resistive programming of Output Voltage and Output Current limit.
- Select range of remote voltage and resistive programming.
- Select range of Output Voltage and Output Current monitoring.
- Select the Remote Shut-Off control logic.
- Select between RS232 or RS485 communication interface.
- Enable or disable the rear panel Enable/Disable control (dry contact).

Fig.3-4: SW1 setup DIP switch

3-3-1. SW1 position functions◆ Refer to Table 3-1 for description of SW1 position functions. The factory default setting is down for all positions.
Table 3-1: SW1 positions functions
Position

Function

Down(Factory default)

Up

SW1-1

Output Voltage remoteanalog programming

Output Voltage
programmed by Front Panel

Output Voltage programmedby remote analog voltage

SW1-2

Output Current limit
remote analog programming

Output Current limit
programmed by Front Panel

Output current limit
programmed by remoteanalog voltage

SW1-3

Programming range select(Remote voltage/resistive)

0V to 5V/(0kΩ to 5kΩ)

0V to 10V/(0kΩ to 10kΩ)

SW1-4

Output Voltage andCurrent Monitoring range

0V to 5V

0V to 10V

SW1-5

Shut Off logic selectOn: High (2V to 15V) or Open
Off: Low (0V to 0.6V) or Short

On: Low (0V to 0.6V) or Short
Off: High (2V to 15V) or Open

SW1-6

RS232/485 select

RS232 interface

RS485 interface

SW1-7

Output Voltage resistive
programming

Output Voltage
programmed by Front Panel

Output Voltage programmedby external resistor

SW1-8

Output Current limit
resistive programming

Output Current limit
programmed by Front Panel

Output Current limit
programmed by external
resistor

SW1-9

Enable/Disable control *2

Rear panel Enable/Disable
control is not active

Rear pane, Enable/Disable
control is active*1*1 Refer to "4-6. Output shut-off (SO) control via rear panel J1 connector".
*2 Refer to "4-7. Enable/disable control via rear panel J1 connector".

3-3-2. Resetting the SW1 switch
Before making any changes to the SW1 switch setting, disable the power supply output by pressing the front panel
OUTPUT button. Ensure that the output voltage falls to zero and OUTPUT LED is off, then use any small flat-bladed
screwdriver to change the SW1 switch setting.

19

3-4. J1 programming and monitoring connector
The J1 Programming and Monitoring connector is a DB25 subminiature connector located on the power supply rear
panel. Refer to Table 4-4 for description of the connector functions. The power supply default configuration is Local
operation which does not require connections to J1. For remote operation using J1 signals use the plug provided withpower supply or equivalent type. It is essential to use plastic body plug to conform with Safety Agency requirements.
If a shield is required for J1 wires, connect the shield to a power supply chassis ground screw

3-4-1. Making J1 connections- J1 connector- J1 plug (accessory)- Wire dimension range- Manual Pistol Grip tool
- Extraction tool

: AMP
: 5747461-3: AMP: 745211-7: AWG26 to 22: AMP: Handle type
: 58074-1: AMP: Head type
: 58063-2: AMP, 91232-1 or equivalent.

Before making any connection, turn the AC On/Off switch to the Off position and wait until the front Panel display
has turned Off.
Terminals 12, 22 and 23 of J1 are connected internally to the negative sense (-S)
potential of the power supply. Do not attempt to bias any of these terminals relative
to the negative sense. Use the isolated. Programming interface option to allow
control from a programming source at a different potential relative to the power
supply negative.
To prevent ground loop and to maintain the isolation of the power supply when
programming from J1, use an Ungrounded programming source.

There is a potential shock hazard at the output when using a power supply with rated
output greater than 40V. Use wires with minimum insulation rating equivalent to the
maximum output voltage of the power supply.

20

Fig.4-4: J1 connector terminals and functions

J1 contact

Signal name

J1-1

ENA_IN

J1-2
J1-3

IF_COM

J1-4 to 7

N/C

J1-8

LOCAL/
REMOTE

J1-9

VPGM

J1-10

IPGM

J1-11

VMON

J1-12

COM

J1-13

CV/CC

J1-14

ENA_OUT

J1-15

SO

J1-16

PS_OK

J1-17 to 20

N/C
LOC/REM
SIGNAL

J1-21
J-22

VPGM_RTN

J1-23

IPGN_RTN

J1-24

IMON

J1-25

P

Table 4-4: J1 connector terminals and functions
Function
Enable/Disable the power supply output by dry-contact (short/open)◆ Refer to "4-7. Enable/disable control via rear panel J1 connector".
Isolated Interface Common. Return for the SO control, PS_OK signal and for the
optional GP-IB interface.
◆ Refer to "4-6. Output shut-off (SO) control via rear panel J1 connector".
◆ Refer to "4-9. PS_OK signal".
No Connection
Input for selecting between Local or Remote analog programming of output
voltage and output current.
◆ Refer to "5-1. LOCAL /REMOTE analog control".
Input remote analog voltage/resistance programming of the Output Voltage.
◆ Refer to "5-3. Remote voltage programming of output voltage and current limit".
◆ Refer to "5-4. Resistive programming of output voltage and current limit".
Input for remote analog voltage/resistance programming of the Output Current.
◆ Refer to "5-3. Remote voltage programming of output voltage and current limit".
◆ Refer to "5-4. Resistive programming of output voltage and current limit".
Output for monitoring the power supply Output Voltage.
◆ Refer to "5-5. Remote monitoring of output voltage and current".
Control Common. Return for VMON, IMON, CV/CC, RMT/LCL. Connectedinternally to the negative sense potential (-S).
Output for Constant-Voltage/Constant-Current mode indication.
◆ Refer to "4-8. CV/CC signal".
Enable/Disable the power supply output by dry-contact (short/open) with ENA_IN.
◆ Refer to "4-7. Enable/disable control via rear panel J1 connector".
Input for Shut-Off control of the power supply output.
◆ Refer to "4-6. Output shut-off (SO) control via rear panel J1 connector".
Output for indication of the power supply status.
◆ Refer to "4-9. PS_OK signal".
No Connection
Output for indicating if the unit is in Local or Remote analog programming mode.
◆ Refer to "5-2. LOCAL/REMOTE analog indication".
Return for VPGM input. Connected internally to the “-S”.
◆ Refer to "5-3. Remote voltage programming of output voltage and current limit".
◆ Refer to "5-4. Resistive programming of output voltage and current limit".
Return for IPGM input. Connected internally to the “-S”.
◆ Refer to "5-3. Remote voltage programming of output voltage and current limit".
◆ Refer to "5-4. Resistive programming of output voltage and current limit".
Output for monitoring the power supply Output Current.
◆ Refer to "5-5. Remote monitoring of output voltage and current".
Output for current balance in parallel operation.
◆ Refer to "4-14. Parallel operation".

21

4. LOCAL OPERATIONThis Chapter describes the operating modes that are not involved in programming and monitoring the power supply via
its serial communication port (RS232/RS485) or by remote analog signals. Ensure that the RMT/LCL on the front
panel is off, indicating Local mode. If the RMT/LCL LED is on, press the front panel RMT/LCL button to change theoperating mode to local.
◆ For information regarding remote analog programming refer to "5. REMOTE ANALOG PROGRAMMING".
◆ For information regarding usage of the serial communication port refer to "6. RS232 & RS485 REMOTE CONTROL".

4-1. Standard operation
The power supply has two basic operating modes: Constant Voltage Mode and Constant Current Mode. The mode inwhich the power supply operates at any given time depends on the output voltage setting, output current limit setting
and the load resistance.

4-1-1. Constant Voltage Mode
1. In constant voltage mode, the power supply regulates the output voltage at the selected value, while the load current
varies as required by the load.
2. While the power supply operates in constant voltage mode, the CV LED on the front panel illuminates.
3. Adjustment of the output voltage can be made when the power supply output is enabled (Output On) or disabled(Output Off). When the output is enabled, simply rotate the VOLTAGE encoder knob to program the output voltage.
When the output is disabled, press the V/I CHK button and then rotate the VOLTAGE encoder knob.
The VOLTAGE meter will show the programmed output voltage for 5 seconds after the adjustment has been
completed. Then the VOLTAGE meter will display "OFF".
4. Adjustment resolution can be set to coarse or fine resolution.
Press FINE button to select between the lower and higher resolution. The FINE LED turns On when the resolution
is set to FINE.
If after completing the adjustment, the display shows a different value than the setting, the power supply
may be at constant current made limit. Check the load condition and the power supply constant current
made setting.
The maximum and minimum setting values of the output voltage are limited by the Over Voltage protection
and Under Voltage limit setting.
◆ Refer to "4-2. Over voltage protection (OVP)" and"5-4. Resistive programming of output voltage and current limit".

4-1-2. Constant Current Operation
1. In constant current mode, the power supply regulates the output current at the selected value, while the voltage
varies with the load requirement.
2. While the power supply is operating in constant current mode, the CC LED on the front panel illuminates.
3. Adjustment of the output current limit can be made when the power supply output is enabled (Output On) or disabled(Output Off).
- Disabled output (Off): Press V/I CHK button and then rotate the Current encoder knob. The CURRENT meter
will show the programmed constant current made for 5 seconds after the adjustment has been completed.
Then the VOLTAGE meter will display "OFF".
- Enabled output, power supply in Constant Voltage mode: Press the V/I CHK button and thenrotate the CURRENT encoder knob. The CURRENT meter will show the programmed constant current made for
5 seconds after the adjustment has been completed, and then will return to show the actual load current.
- Enabled output, power supply in Constant Current mode: Rotate the CURRENT encoder knob to adjust theconstant current made.
4. Adjustment resolution can be set to Coarse or Fine adjustment. Press the FINE button to select between theCoarse and Fine resolution. The FINE LED turns On when the resolution is set to FINE.

4-1-3. Automatic Crossover
If the power supply operates in Constant Voltage mode, while the load current is increased to greater than the constantcurrent made setting, the power supply will automatically switch to Constant Current mode. If the load is decreased
to less than the current limit setting, the power supply will automatically switch back to Constant Voltage mode.

22

4-2. Over voltage protection (OVP)The OVP circuit protects the load in the event of a remote or local programming error or a power supply failure.
The protection circuit monitors the voltage at the power supply sense points and thus providing the protection level at
the load. Upon detection of an Over Voltage condition, the power supply output will shut down.

4-2-1. Setting the OVP level
The OVP can be set when the power supply output is Enabled (On) or Disabled (Off). To set the OVP level, press the
OVP/UVL button, so that the CURRENT meter shows "OUP".
The VOLTAGE meter shows the OVP setting level. Rotate the VOLTAGE encoder knob to adjust the OVP level.
The display will show "OUP" and the setting value for 5 seconds after the adjustment has been completed and then will
return to it's previous state.
Table 5-1: Maximum OVP setting levels
Model (V)Max. OVP (V)Model (V)Max. OVP (V)

6

7.5

60

66.0

8

10.0

80

88.0

12.5

15.0

100

110.0

20

24.0

150

165.0

30

36.0

300

330.0

40

44.0

600

660.

To preview the OVP setting, press OVP/UVL pushbutton so that the CURRENT display
will show "OUP". At this time, the VOLTAGE display will show the OVP setting. After 5 seconds,
the display will return to it's previous state.

4-2-2. Activated OVP protection indications
When the OVP is activated the power supply output shuts down. The VOLTAGE display shows "OUP" and the
ALARM LED blinks.

4-2-3. Resetting the OVP circuit
To reset the OVP circuit after it activates:
1. Reduce the power supply Output Voltage setting below the OVP set level.
2. Ensure that the load and the sense wiring are connected properly.
3. There are four methods to reset the OVP circuit.
3.1 Press OUTPUT button.
3.2 Turn the power supply off using the AC On/Off switch, wait until the front panel display turns
Off, then turn the power supply on using the AC On/Off switch.
3.3 Turn the power supply output off and then On using the SO control. In this method the power supply
should be set to Auto-Restart mode.
◆ Refer to "4-6. Output shut-off (SO) control via rear panel J1 connector".
3.4 Send OUT 1 command via the RS232/485 communication port.

4-3. Under voltage limit (UVL)The UVL prevents adjustment of the output voltage below a certain limit.
allow the user to create a protection window for sensitive load circuitry.

The combination of UVL and OVP functions,

4-3-1. Setting the UVL level
Setting the UVL can be made when the power supply output is Enabled (On) or Disabled (Off). To set the UVL level,press the OVP/UVL button TWICE, so that the CURRENT meter shows “UUL”. The VOLTAGE meter shows the UVL
setting level. Rotate the VOLTAGE encoder knob to adjust the UVL level. The display will show “UUL” and thesetting value for 5 seconds after the adjustment has been completed and then will return to it’s previous state. UVL
setting values are limited at the maximum level to approximately 5% below the Output Voltage setting. Attempting toadjust the UVL above this limit will result in no response to the adjustment attempt. The minimum UVL setting is zero.

23

4-4. Foldback protection
Foldback protection will shut down the power supply output if the load current exceeds the current limit setting level.
This protection is useful when the load circuitry is sensitive to an over current condition.

4-4-1. Setting the Foldback protection
To arm the Foldback protection, the FOLD button should be pressed so that the FOLD LED illuminates. In thiscondition, transition from Constant Voltage to Constant Current mode will activate the Foldback protection. Activationof the Foldback protection disables the power supply output, causes the ALARM LED to blink and display " Fb " on the
VOLTAGE meter.

4-4-2. Resetting activated Foldback protection
There are four methods to reset an activated Foldback protection.
1. Press the OUTPUT button. The power supply output is enabled and the Output Voltage and current will returnto their last setting. In this method, the Foldback protection remains armed, therefore if the load current ishigher than the current limit setting, the Foldback protection will be activated again.
2. Press the FOLD button to cancel the Foldback protection. The power supply output will be disabled and the
VOLTAGE display will show “OFF”. Press the OUTPUT button to enable the power supply output.
3. Turn the power supply output Off and then On using the SO control . In this method the Foldback protection
remains armed, therefore if the load current is higher than the current limit setting the Foldback protection will be
activated.
◆ Refer to "4-6. Output shut-off (SO) control via rear panel J1 connector".
4. Turn the power supply Off using the AC On/Off switch, wait until the front panel display turns Off, then turn theunit back ON again. The power supply output is enabled and the Output Voltage and Current will return to theirlast setting. In this method, the Foldback protection remains armed, therefore if the load current is higher thanthe current limit setting, the Foldback protection will be activated again.

4-5. Output ON/OFF control
The Output On/Off enables or disables the power supply output. Use this function to make adjustments to either the
power supply or the load without shutting off the AC power. The Output On/Off can be activated from the front panel
using the OUTPUT button or from the rear panel J1 connector. The OUTPUT button can be pressed at any time toenable or disable the power supply output. When the output is disabled, the output voltage and current fall to zeroand the VOLTAGE display shows “OFF”.

24

4-6. Output shut-off (SO) control via rear panel J1 connector
Contacts 2, 3 and 15 of J1 (Fig.3-2, Item 24) serve as Output Shut-Off (SO) terminals. The SO terminals accept a
2.5V to 15V signal or Open-Short contact to shut off the power supply output. To rise the output again after shut-off,
apply the reverse-logic signal (Table 4-2) to the SO terminals. This function is useful for connecting power supplies ina “Daisy-chain”. The SO control can be used also to reset the OVP and Fold Protection.
◆ Refer to "4-2. Over voltage protection (OVP)" and "4-3. Under voltage limit (UVL)" for details.
When the unit is shut-off by J1 signal, the VOLTAGE display will show “SO” to indicate the unit state. J1 contact 15 is
the SO signal input and contacts 2 and 3, IF_COM, are the signal return (connected internally). Contacts 2, 3 and 15
are optically isolated from the power supply output. The SO control logic can be selected by the rear panel SW1
Setup switch.
◆ Refer to Table 4-2 for SW1 setting and SO control logic.
In Auto-Restart mode the output will re-rise automatically after reset the SO control,
but in safe start mode pushing OUTPUT button is needed to raise the output again
after reset
Table 4-2: SO logic selection
SO signal levelJ1-2(3), 15

Power supply output

Display

Down (default)

2V to 15V or Open
0V to 0.6V or ShortOn
OffVoltage/Current
“SO”

Up

2V to 15V or Open
0V to 0.6V or Short

Off
On

“SO”
Voltage/Current

SW1-5 settingThis function cannot be used with Output OFF.
interception (SO).

Please turn ON an output using the function of output

4-7. Enable/disable control via rear panel J1 connector
Contacts 1 and 14 of J1 (Fig.3-3, Item 24) serve as Output Enable/Disable terminals by switch or relay. This function isenabled or disabled by the SW1 Setup switch position 9.
◆ Refer to Table 4-3 for Enable/Disable function andSW1setting.

SW1-9 setting
Down (default)
Up

Table 4-3: Enable/Disable function and SW1 setting
Enable/Disable inputs
Power supply output
Display
Open or ShortOn
Voltage/Current
Open
Short

Off
On

“ENA”
Voltage/Current

ALARM LED
Off
Blinking
Off

To prevent possible damage to the unit, do not connect any of the Enable/Disable
inputs to the positive or negative output potential.

If the Enable/Disable inputs are opened in Safe Start mode, it is required to short the Enable /Disable inputs
and then press OUTPUT button or send OUT1 command to resume operation. But in auto-restart mode set
these inputs short, and then the output will rise up automatically after output-off by this function.

25

4-8. CV/CC signal
CV/CC signal indicates the operating mode of the power supply, Constant Voltage or Constant Current.
CV/CC signal is an open collector output with a 30V parallel zener, at J1-13, referenced to the COM potential at J1-12(connected internally to the negative sense potential). When the power supply operates in Constant Voltage mode,
CV/CC output is open. When the power supply operates in Constant Current mode, CV/CC signal output is low(0-0.6), with maximum 10mAsink current.
Do not connect CV/CC signal to a voltage source higher than 30VDC.
Always connect CV/CC signal to the voltage source with a series resistor to limit thesink current to less than 10mA.

4-9. PS_OK signal
PS_OK signal indicates fault condition in the power supply. PS_OK is a TTL signal output at J1-16, referenced to
IF_COM at J1-2, 3 (Isolated Interface Common)). When a fault condition occurs, PS_OK level is low, with maximum
sink current of 1mA, when no fault condition occurs, PS_OK level is high with maximum source current of 2mA.
The following faults will set the PS_OK to Fault state:- OTP
Enable/Disable open
- OVP
SO (Rear panel Shut-Off)- Foldback
GP-IB failure (with optional GP-IB interface)- AC fail
Output Off

4-10. Safe start and auto-restart modes
When turning on the power supply AC On/Off, it can start to its last setting of Output Voltage and Current limit with theoutput enabled (Auto-restart) or start with the output disabled (Safe mode).
Press and hold the OUTPUT button to select between Safe start and Auto-restart modes. The VOLTAGE display willcontinuously cycle between "SAF" and "AUT" every 3 seconds. Releasing OUTPUT pushbutton while one of themodes is displayed, selects that mode. The default setting at shipment is Safe mode.

4-10-1. Automatic start mode
In this mode, the power supply restores its last operation setting. Upon start-up, the output is enabled or disabledaccording to its last setting. Confirm its last output setting before AC turn-on again.

4-10-2. Safe start mode
In this mode, the power supply restores its last operation setting and sets the Output to off state. At start-up, theoutput is disabled and the output voltage and current are zero. To enable the output and restore the last output
voltage and current limit values, momentarily press OUTPUT button.

4-11. Over temperature protection (OTP)
The OTP circuit shuts down the power supply before the internal components can exceed their safe internal operating
temperature. When an OTP shutdown occurs, the display shows "OTP" and the ALARM LED blinks. Resetting the
OTP circuit can be automatic (non-latched) or manual (latched) depending on the Safe or Automatic restart mode.
1. Safe start mode:
In Safe start mode, the power supply stays off after the over temperature condition has been removed.
The display continue to shows "OTP" and the ALARM LED continues to blink. To reset the OTP circuit, press
OUTPUT button (or send OUT ON command via the serial port).
2. Auto-restart mode:
In Auto-restart mode, the power supply recovers to it's last setting automatically when the over temperature
condition is removed.

26

4-12. Last setting memory
The power supply is equipped with Last Setting Memory, which stores power supply parameters at each AC turn-off
sequence.
STOREDPARAMETERS:
1. Output voltage setting
2. Output constant・current mode・limit
3. OVP level
4. UVL level
5. FOLD setting
6. Start-up mode (Safe or Auto-restart)
7. Remote/Local (If the last setting was Local Lockout, the supply will return to Remote mode)
8. Address setting
9. Baud rate
10. Locked /Unlocked front panel◆ Items 7, 8, 9 are related to Remote digital control operation and explained in "6. RS232 & RS485 REMOTE
CONTROL".

4-13. Series operation
Power supplies of the SAME MODEL can be connected in series to obtain increased output voltage.
Split connection of the power supplies gives positive and negative output voltage.

Do not connect power supplies from different manufacturers in series or in parallel.

4-13-1. Series connection for increased output voltage
In this mode, two units are connected so that their outputs are summed. Set the current limit of each power supply tothe maximum that the load can handle without damage. It is recommended that diodes be connected in parallel witheach unit output to prevent reverse voltage during start up sequence or in case one of the units shuts down.
Each diode should be rated to at least the power supply rated output voltage and output current.
◆ Refer to Fig.4-1 and 4-2 for series operation with local and remote sensing.
When power supplies are connected in series, and the load or one of the output
terminals is grounded, no point may be at a greater potential of ±60VDC
from ground for models up to 60VDC Rated Output and ±600VDC from ground formodels >60VDC Rated Output.
◆ When using RS232/485 or GP-IB, refer to the OUTPUT TERMINALS GROUNDING
warning, "2-10-11. Grounding outputs".

Fig.4-1: Series connection, local sensing

Fig.4-2: Series connection, remote sensing

27Remote programming in series operation for increased output voltage:
1. Programming by external voltage:
The analog programming circuits of this power supply are referenced to the negative Sense (-S) potential.
Therefore, the circuits used to control each series connected unit must be separated and floated from each other.
2. Using the SO function and PS_OK signal:
The Shut-Off and PS_OK circuits are referenced to the isolated interface common, IF_COM (J1-2, 3).
The IF_COM terminals of different units can be connected to obtain a single control circuit for the power supplies
connected in series.
3. Programming by external resistor:
Programming by external resistor is possible.
◆ Refer to "5-4. Resistive programming of output voltage and current limit".
4. Programming via the Serial Communication port (RS232/RS485):
The communication port is referenced to the IF_COM which is solated from the power supply output potential.
Therefore power supplies connected in series can be chained using the Remote-In and Remote-Out connectors.
◆ Refer to "6. RS232 & RS485 REMOTE CONTROL".

4-13-2. Series connection for positive and negative output voltage
In this mode, two units are configured as a positive and negative output. Set the current limit of each power supply tothe maximum that the load can handle without damage. It is recommended that diodes be connected in parallel witheach unit output to prevent reverse voltage during start-up or in case one of the units shuts down. Each diode shouldbe rated to at least the power supply rated output voltage and output current.
◆ Refer to Fig.4-3 for this operating mode.
+LS
POWER
SUPPLY

+S
＋
*
－

-LS

-S

＋

+LS

+S

－

POWER
SUPPLY
-LS

LOAD
COM.

＋

* Diodes are user supplied.

*－-S

Fig.4-3: Series connection for positive/negative output voltages
Remote programming in series operation for positive and negative output voltage
1. Programming by external voltage:
The analog programming circuits of this power supply are referenced to the negative Sense potential.
Therefore, the circuits used to control each series connected unit must be separated and floated from each other.
2. Using the SO function and PS_OK signal:
The Shut-Off and PS_OK circuits are referenced to the isolated interface common, IF_COM (J1-2, 3).
The IF_COM terminals of the units can be connected to obtain a single control circuit for the power supplies
connected in series.
3. Programming by external resistor:
Programming by external resistor is possible.
◆ Refer to "5-4. Resistive programming of output voltage and current limit".
4. Programming via the Serial Communication port (RS232/RS485):
The communication port is referenced to the IF_COM which is isolated from the power supply output potential.
Therefore power supplies connected in series can be chained using the Remote-In and Remote-Out connectors.

28

4-14. Parallel operation
4-14-1. Parallel operation (1)Up to four units of the same VOLTAGE and CURRENT rating can be connected in parallel to provide up to four times
the output current capability. One of the units operates as a master and the remaining units are slaves. The slave
units are analog programmed by the master unit. In remote digital operation, only the master unit can be
programmed by the computer while the slave units may be connected to the computer for voltage, current and status
readback only. Follow the following procedure to configure multiple supplies for parallel operation.
1. Setting up the Master unit
Set the master unit output voltage to the desired voltage. Program the current limit to the desired load current
limit divided by the number of parallel units. During operation, the master unit operates in CV mode, regulating
the load voltage at the programmed output voltage. Connect the sensing circuit to local or remote sensing as
shown in Fig.4-4 or Fig.4-5.
2. Setting up the Slave units- The output voltage of the slave units should be programmed higher than the output voltage of the master unit
to prevent interference with the master unit's control. The current limit of each unit should be programmed
to the desired load current limit divided by the number of parallel units.
- . Set the rear panel setup switch SW1 position 2 to it's up position.
- . Connect J1 terminal 10 (IPGM) of the slave unit to J1 terminal 25 (P) of the master unit.
During operation the slave units operate as a controlled current source following the master output current.
It is recommended that the power system is designed so that each unit supplies up to 95% of its current rating
because of the imbalance which may be caused by cabling and connections voltage drop.
3. Setting Over Voltage protection
The master unit OVP should be programmed to the desired OVP level. The OVP of the slave units should be
programmed to a higher value than the master OVP. When the master unit shuts down, it programs the slave
unit to zero output voltage. If a slave unit shuts down (when its OVP is set lower than the master output voltage),
only that unit would shut down and the remaining slave units would supply all the load current.
4. Setting Foldback protection
Foldback protection if desired, may only be used with the master unit. When the master unit shuts down it
programs the slave units to zero output voltage.
5. Connection to the load
In parallel operation, power supplies can be connected in local or remote sensing.
◆ Refer to Fig.4-4 and 4-5 for typical connections of parallel power supplies.
The figures show connection of two units, however the same connection method applies up to 4 units.

29

4-14-2. Parallel operation (2)In this method, multiple supplies can be configured to parallel operation as a single power supply. The total load current
and output voltage are displayed by the Master unit and can be readback from the Master unit. The Slave units display
only their operating status (ON, OFF or Fault condition).
(1) Basic configuration◆ Refer to the following procedure to configure multiple supplies for advanced parallel operation.
(2) Setting the units as Master or Slave- Depress and hold the FINE button for 3 seconds. The Master/Slave configuration will be displayed on the
Current Display. Rotate the CURRENT encoder to obtain the desired mode.
◆ Refer to Table 4-4 for the CURRENT display and modes of operation.
- When the desired configuration is obtained, depress and release the FINE button or wait approx. 5 seconds.
Table 4-4 Setting mode of operation
Current display

Operating mode

H1

Single supply （default）

H2

Master supply with 1 Slave supply

H3

Master supply with 2 Slave supply

H4

Master supply with 3 Slave supply

S

Slave supply(3) Master and Slave units default operation① When a unit is programmed to Slave mode it enters the Remote mode with Local Lockout. In this mode,the front panel controls are disabled to prevent accidental setting change.
② The Slave units parameters will automatically set the following:- Output voltage to approximate. 102% of rated output voltage.
- Programmed Current to zero.
- UVL to zero volts- OVP to its maximum value- AST ON
- Out ON
- Foldback protection OFF③ The Master and Slave modes are stored in the power supply EEPROM when the AC power is turned off.
The system will return to the Master/Slave mode upon re-application of AC power.
(4) Current display accuracy
In the advanced parallel mode, the total current is programmed and reported by the Master. In this method,
the CURRENT display accuracy is 2% ±1 count. In cases that higher accuracy is required, it is recommended
to use the basic parallel operation mode.
(5) To release units from Slave mode
Slave units can be released using the following procedure:- Depress FINE button for 3 seconds.
The Master/Slave configuration will be displayed on the CURRENT display.
- Select H1 mode using the CURRENT encoder.
- Depress FINE button again or wait 5 seconds.
- Turn the AC power OFF to store the new setting.
Make sure that the connection between -Vo terminals are reliable to avoid
disconnection during operation. Disconnection may cause damage to the power
supply.

With local sensing it is important to minimize the wire length and resistance.
Also the positive and negative wire resistance should be close as possible to each other to achieve current
balance between power supplies.

30

Fig.4-4: Parallel connection with local sensing
Twisted pair
＋S

－S

－S

As short as possible

＋S

＋S

＋V

MASTER
POWER SUPPLY －V
J1-25

P

＋

IPGM

－

LOAD
J1-8 J1-12 J1-10＋V
SLAVE
POWER SUPPLY
－S

＋S

－V

Twisted pair

－S

－S

＋S

Fig.4-5: Parallel operation with Remote sensing

4-15. Daisy-chain connection
It is possible to configure a multiple power supply system to shut down all the units when a fault condition occurs in oneof the units. When the fault is removed, the system recovers according to its setting to Safe start mode or Automatic
restart. Setup switch SW1 position 5 should be set to its Down position to enable the Daisy-chain operation. Other
SW1 positions can be set according to the application requirements. If a fault occurs in one of the units its PS_OK
signal will be set to low level and the display will indicate the fault. The other units will shut off and their display will
indicate "SO”. When the fault condition is removed, the units will recover to their last setting according to their Safe
start or Auto-restart setting. Fig.4-6 shows connection of three units, however the same connection method applies
to systems with a larger number of units.

Fig.4-6: Daisy-chain connection31

4-16. Front panel locking
The front panel controls can be locked to protect from accidental power supply parameter change.
Press and hold V/I CHK button to toggle between “Locked front panel” and “Unlocked front panel”.
The display will cycle between “LFP” and “UFP”. Releasing the V/I CHK button while one of the modes is displayed,
selects that mode.

4-16-1. Unlocked front panel
In this mode, the front panel controls are enabled to program and monitor the power supply parameters.

4-16-2. Locked front panel
In this mode the following front panel controls are disabled:- VOLTAGE and CURRENT encoders.
- FOLD button.
- OUTPUT button.
The power supply will not respond to attempts to use these controls. The VOLT display will show
“LFP” to indicate that the front panel is locked.
OVP/UVL button is active to preview the OVP and UVL setting.
Use V/I CHK button to preview the output voltage and current setting or to unlock the front panel.

32

5. REMOTE ANALOG PROGRAMMING
The rear panel connector J1 allows the user to program the power supply output voltage and current limit with ananalog device. J1 also provides monitoring signals for output voltage and output current.
The programming range and monitoring signals range can be selected between 0V to 5V or 0V to 10V using the setup
switch SW1. When the power supply is in Remote Analog programming, the serial communication port is active andcan be used to read the power supply parameters.
COM (J1-12), VPGM_RTN (J1-22) and IPGM_RTN (J1-23) terminals of J1connect
internally to the -Sense potential (-S). Do not connect these terminals to any
potential other than -Sense (-S), as it may damage the power supply.

5-1. LOCAL /REMOTE analog control
Contact 8 of J1 (Fig. 3-3, item 24) accepts TTL signal or Open-Short contact (referenced to J1-12) to select between
Local or Remote Analog programming of the output voltage and current limit.
In Local mode, the output voltage and current limit can be programmed via the front panel VOLTAGE and CURRENT
encoders or via the RS232/485 port. In Remote Analog mode, the output voltage and current limit can be
programmed by analog voltage or by programming resistors via J1 contacts 9 and 10.
◆ Refer to "5-3. Remote voltage programming of output voltage and current limit" and"5-4. Resistive programming of output voltage and current limit".
◆ Refer to Table 5-1 for Local/Remote Analog control (J1-8) function and Setup switch SW1-1, 2 setting.
Table 5-1: Local/Remote Analog control function
SW1-1,2 setting

J1-8 function

Output voltage/Current setting

Down (default)

No effect

Local

Up

“0” or Short

Remote“1” or OpenLocal

5-2. LOCAL/REMOTE analog indication
Contact 21 of J1 (Fig. 3-3, item 24) is an open collector output that indicates if the power supply is in Local mode or in
Remote Analog mode. To use this output, connect a pull-up resistor to a voltage source of 30Vdc maximum.
Choose the pull-up resistor so that the sink current will be less than 5mA when the output is in low state.
◆ Refer to Table 5-2 for J1-21 function.
Table 5-2: Local/Remote Analog indication
J1-8

SW1-1

SW1-2

J1-21 signal

TTL “0” or short

Down

Down

Open

Down

Up

0V to 0.6V

Up

Down

0V to 0.6V

UpUp

0V to 0.6V

Down or Up

Down or UpOpen

TTL “1” or open

33

5-3. Remote voltage programming of output voltage and current limit
To maintain the isolation of power supply and prevent ground loops, use an isolated
programming source when operating the power supply via remote analog
programming at J1 connector.

Perform the following procedure to set the power supply to Remote Voltage programming:
1. Turn the power supply AC On/Off switch to Off.
2. Set setup switch SW1 position 1 and 2 to their UP position.
3. Set SW1 position 3 to select programming voltage range according to Table 5-3.
4. Ensure that SW1 positions 7 and 8 are at their Down (default) position.
5. Connect a short between J1-8 and J1-12.
◆ Refer to Fig 5-1 and "3-4-1. Making J1 connections".
6. Connect the programming source to the mating plug of J1 as shown in Fig.5-1. Observe correct polarity for thevoltage source.
◆ Refer to "3-4-1. Making J1 connections".
7. Set the programming sources to the desired levels and turn the power supply ON. Adjust the programming
sources to change the power supply output.
NOTES:
1. SW1 positions 4, 5, 6 and 9 are not required for remote programming. Their setting can be determinedaccording the application.
2. The control circuits allow the user to set the output voltage and current limit up to 5% over themodel-rated maximum value. The power supply will operate within the extended range, however it is
not recommended to operate the power supply over its voltage and current rating and performance is
not guaranteed.
3. When voltage programming is used, front panel and computer control (via serial communication port)of output voltage and current are disabled.
Table 5-3: SW1-3 setting and programming range
SW1-3 setting

Output Voltage programming
VPGM (J1-9)

Current limit programming
IPGM (J1-10)

UP

0V to 10V

0V to 10V

DOWN

0V to 5V

0V to 5V

Fig.5-1: Remote voltage programming connection34

5-4. Resistive programming of output voltage and current limit
For resistive programming, internal current sources, for output voltage and/or output current control, supply 1macurrent through external programming resistors connected between J1-9 & 22 and 1-10 & 23. The voltage acrossthe programming resistors is used as a programming voltage for the power supply. Resistance of 0kΩ to 5kΩor 0kΩ
to 10kΩ can be selected to program the output voltage and current limit from zero to full scale. A variable resistor cancontrol the output over its entire range, or a combination of variable resistor and series/parallel resistors can control the
output over restricted portion of its range.
Perform the following procedure to set the power supply to Resistive programming:
1. Turn the AC On/Off switch to Off.
2. Set setup switch SW1 positions 1 and 2 to their UP position.
3. Set SW1 position 3 to select programming resistor range according to Table 5-4.
4. Set SW1 positions 7 and 8 to their UP position to enable resistive programming mode.
5. Connect a short between J1-8,J1-12 and J1-23.
◆ Refer to Fig 5-2 and "3-4-1. Making J1 connections".
6. Connect the programming resistors to the mating plug of J1-22(VPGM_RTN), J1-23(IPGM_RTN) as shownin Fig.5-2.
◆ Refer to "3-4-1. Making J1 connections".
7. Set the programming resistors to the desired resistance and turn the power supply ON.
Adjust the resistors to change the power supply output.
1. SW1 positions 4, 5, 6 and 9 are not required for remote programming. Their setting can be determinedaccording to the application requirements.
2. The control circuits allow the user to set the output voltage and current limit up to 5% over themodel-rated maximum value. The power supply will operate within the extended range, however it is notrecommended to operate the power supply over its voltage and current rating and performance is notguaranteed.
3. To maintain the temperature stability specification of the power supply, the resistors used forprogramming should be stable and low noise resistors, with temperature coefficient of less than 50ppm.
4. When resistive programming is used, front panel and computer control (via serial communication port)of output voltage and current are disabled.
Table 5-4: SW1-3 setting and programming range
SW1-3 setting

Output Voltage programming
VPGM (J1-9)

Current limit programming
IPGM (J1-10)UP

0kΩ to 10kΩ0kΩ to 10kΩDOWN

0kΩ to 5kΩ

0kΩ to 5kΩ

Fig.5-2: Remote resistive programming35

5-5. Remote monitoring of output voltage and current
The J1 connector, located on the rear panel provides analog signals for monitoring the output voltage and output
current. Selection of the voltage range between 0V to 5V or 0V to 10V is made by setup switch SW1-4.
The monitoring signals represent 0% to 100% of the power supply output voltage and output current. The monitor
outputs have 500Ω series output resistance. Ensure that the sensing circuit has an input resistance of greater than
500kΩ or accuracy will be reduced.
◆ Refer to Table 5-5 for required J1 connection, SW1-4 setting and monitoring voltage range.
Table 5-5 Monitoring signals setting
J1 connection

Signal Name

Signal function

VMON

Vout monitor

J1-11

IMON

Iout monitor

J1-24

VMON

Vout monitor

J1-11

IMON

Iout monitor

J1-24

Signal (+)

Range

SW1-4

J1-12

0V to 5V

Down

J1-12

0V to 10v

Up

Return (-)

Notes:
1. Radiated emissions, FCC requirements:
FCC requirements for radiated emissions, use shielded cable for the analog control signals. In case of using
unshielded cable, attach an EMI ferrite suppressor to the cable, as close as possible to the power supply.
2. Front panel encoders operation:
In Remote analog mode the output voltage and current can’t be set by the VOLTAGE and CURRENT encoders.
3. Front panel V/I CHK button:
Use V/I CHK button to display the output voltage and current setting defined by the encoders or communication.
4. Communication:
In Remote analog mode, power supply parameters can be programmed and readback via the communication
port except output voltage and current setting.

36

6. RS232 & RS485 REMOTE CONTROLThis chapter describes the operation of the PU1500W power supplies via the serial communication port. Details of theinitial set-up, operation via RS232 or RS485, the command set and the communication protocol are described in thischapter.

6-1. Configuration
6-1-1. Default setting
The power supply is shipped with the following setting:- Address- Baud-rate- RS232/485- V out setting- I out setting

6
9600
RS232
0
0

- Output- Start up mode
- OVP
- UVL
- Foldback

Off
Safe start
Maximum0Off

6-1-2. Address setting
The power supply address can be set to any address between 0 and 30. Follow the instructions described below to
set the address.
(1) If the unit is in Remote mode (front panel RMT/LCL LED illuminates), press RMT/LCL button to put the unit into
Local mode.
(2) Press and hold for approximately 3sec. the RMT/LCL button. The VOLTAGE display will indicate thecommunication port address.
(3) Using the VOLTAGE adjust encoder, select the address.
To preview the address at any time, press and hold the RMT/LCL button for approx. 3sec. The VOLTAGE display will
indicate the power supply address.

6-1-3. RS232 or RS485 selection
To select between RS232 or RS485 set the rear panel setup switch SW1-6 position to:- Down for RS232- Up for RS485

6-1-4. Baud rate setting
Five optional rates are possible: 1200, 2400, 4800, 9600 and 19200. To select the desired rate, the following steps
should be taken:(1) If the unit is in Remote mode (front panel RMT/LCL LED illuminates), press RMT/LCL button to put the unit into
Local mode.
(2) Press and hold for approx. 3sec. the RMT/LCL button. The CURRENT display will show the communication
port Baud Rate.
(3) Using the CURRENT adjust encoder, select the desired Baud Rate.

6-1-5. Setting the unit into Remote or Local mode
(1) The unit will be put into Remote mode only via serial communication command.
Commands that will put the unit into Remote mode are:
RST
PV n
OUT n
PC n
RMT n ◆ For n values see "6-6-2. Initialization control commands","6-6-4. Output control commands", Tables 6-4,6-5 and 6-6.
(2) There are two Remote modes:- Remote:
In this mode, return to local can be made by the front panel RMT/LCL or via serial portcommand RMT 0. Set the unit into Remote mode via serial port RMT 1 command.
- Local Lock out:
In this mode the unit can be returned to Remote mode via the serial port RMT 1 commandor by turning off the AC power until the display turns off and then turn it to on again.
In Local Lockout mode, the front panel RMT/LCL button is not active. Set the unit into
Local Lockout mode via serial port RMT 2 command.

37

6-1-6. RS232/485 port in Local mode
When the power supply is in local mode, it can receive queries or commands. If a query is received, the power supply
will reply and remain in Local mode. If a command that affects the output is received, the power supply will performthe command and change to Remote mode.
Serial commands may be sent to set the status registers and read them while the unit is in Local mode. If the Enableregisters are set the power supply will transmit SRQ’s while in Local.
◆ Refer to "6-7. Status, error and SRQ registers".

6-1-7. Front panel in Remote mode
Front panel control in Remote mode is disabled except for:
1. V/I CHK: use to preview the Voltage and Current limit setting.
2. OVP/UVL: use to preview the OVP/UVL setting.
3. RMT/LCL use to set the unit into Local mode.
In Local Lockout mode, only PREV and OVP/UVL are active.

6-2. RS232/485 connector
The RS232/485 interface is accessible through the rear panel RS232/485 IN and RS485 OUT connectors.
The connectors are 8 contact RJ-45. The IN and OUT connectors are used to connect power supplies in a RS232 or
RS485 chain to a controller.
◆ Refer to Fig.6-1 for IN/OUT connectors

Fig.6-1: J3 rear panel IN/OUT connectors pinout
Tx and Rx are used for RS232 communication. Txd ± and Rxd ±are used for RS485
communication.
◆ Refer to RS232 and RS485 cables description for connection details.

6-3. Connecting power supplies to RS232 or RS485 bus
6-3-1. Single power supply(1) Select the desired interface RS232 or RS485 using rear panel setup switch SW1-6.
◆ Refer to "3-3. SW1 setup switch".
- RS232: Down position- RS485: Up position(2) Connect rear panel IN connector to the controller RS232 or RS485 port using a suitable shielded cable.
◆ Refer to Figures 6-2, 6-3 and 6-4 for available RS232 and RS485 cables.

38

DB-25 connector
8 Pin connector
Pin No.
Name
Pin No.
name
1
SHIELDSHIELD
2
TX
8
RX
3
RX
7
TX
7
SG
1
SG
Fig.6-2: RS232 cable with DB25 connector

DB-9 connector
8 Pin connector
Pin No.
Name
Pin No.
name
Housing
SHIELD
Housing
SHIELD
2
RX
7
TX
3
TX
8
RX
5
SG
1
SG
Fig.6-3: RS232 cable with DB9 connector

DB-9 connector
8 Pin connector
Pin No.
Name
Pin No.
name
Housing
SHIELD
Housing
SHIELD
9
TXD6
RXD8
TXD+
3
RXD+
1
SG
1
SG
5
RXD5
TXD4
RXD+
4
TXD+
Fig.6-4: RS485 cable with DB9 connector

39

Remarks

Twisted pairremarks

Twisted pairremarks

Twisted pair

Twisted pair

6-3-2. Multi power supply connection to RS232 or RS485 bus
Up to 31 units can be connected to RS232 or RS485 bus. The first unit connects to the controller via RS232 or
RS485 and the other units are connected with RS485 bus.
1. First unit connection:◆ Refer to "6-3-1. Single power supply" for connecting the first unit to the controller.
2. Other units connection: The other units on the bus are connected via their RS485 interface.
◆ Refer to Fig.6-5 for typical connection.
- Set rear panel setup switch SW1-6 to it's UP position- Using the Linking cable supplied with each unit (refer to Fig.6-6), connect each unit OUT connector to the next
unit IN connector.

Fig.6-5: Multi power supplies RS232/485 connection

DB-9 connector
8 Pin connector (out)Pin No.
Name
Pin No.
name
Housing
SHIELD
Housing
SHIELD
1
SG
1
SG
6
TXD6
RXD3
TXD+
3
RXD+
5
RXD5
TXD4
RXD+
4
TXD+
Fig.6-6: Serial link cable with RJ-45 shielded connectors

40

6-4. Communication interface protocol
The address (ADR n: refer to "6-6-2. Initialization control commands") command must return an “OK” response
before any other commands are accepted.

6-4-1. Data format
Serial data format is 8 bit, one start bit and one stop bit. No parity bit.

6-4-2. Addressing
The Address is sent separately from the command.
◆ Refer to "6-6-2. Initialization control commands".

6-4-3. End of Message
The end of message is the Carriage Return character (ASCII 13).
The power supply ignores the Line Feed (ASCII 10) character.

6-4-4. Checksum
The user may optionally add a checksum to the end of the command. The checksum is "$" followed by two hex
characters. If a command or a query has checksum, the response will also have one.
There is no CR between the command string and the "$" sign.
Example: STT?$3A
STAT?$7B

6-4-5. Acknowledge
The power supply acknowledges received command by returning message ( "OK" or other). If an error is detected,
the power supply will return an error message. The rules of checksum apply also to the acknowledge.
And in rare cases, the power supply can not respond because of losing any word from PC.
For the case that power
supply can not respond within 200ms, send same command again with 200ms interval. This 200ms is recommended
interval between command to next command. This power supply does not have "Time-out" function.
For the case that power supply fails to receive "correct command", this incorrect command is still in buffer.
To refresh this buffer, needs to send same command repeatedly. Then power supply should send error message( "C03" or other ) and this shows buffer is refreshed.
◆ Refer to "6-5. Error messages".

6-4-6. Backspace
The backspace character (ASCII 8) clears the last character sent to the power supply.

41

6-5. Error messages
The power supply will return error messages for illegal commands and illegal programming parameters.
◆ Refer to Table 6-1 for programming error messages and Table 6-2 for commands error messages.
Table 6-1: Programming error messages
Error CodeDescription

E01

Returned when program voltage (PV) is programmed above acceptable range.
Example: PV above ‘105% of supply rating’ or ‘PV above 95% of OVP setting’.

E02

Returned when programming output voltage below UVL setting.

E04

Returned when OVP is programmed below acceptable range.
Example: OVP less than ‘5% of supply voltage rating’ plus ‘voltage setting’.

E06

Returned when UVL is programmed above the programmed output voltage.

E07

Returned when programming the Output to ON during a fault shut down.
Table 6-2: Commands error messages

Error CodeDescription

C01

Illegal command or query

C02

Missing parameter

C03

Illegal parameter

C04

Checksum error

C05

Setting out of range

6-6. Command set description
1. Any command or argument may be in capital letters or small letters.
2. In commands with an argument, a space must be between the command and the argument.
3. For any command that sets a numeric value, the value may be up to 12 characters long.
4. Carriage Return: If the CR character (ASCII 13) is received by itself, the power supply will respond with "OK" and CR.

6-6-1. Command set categories
The PU1500W series command set is divided into four categories as follows:
1. Initialization control
2. ID control
3. Output control
4. Status control

42

6-6-2. Initialization control commands
No.

Command

1

ADR n

2

CLS

3

RST

4

RMT

5

RMT?

Description
ADR is followed by address which can be 0 to 30 and is used to access the power supply.
(Please set the standby time about 200ms before the ADR command.)
Clear status. Sets FEVE and SEVE registers to zero
◆ Refer to "6-7. Status, error and SRQ registers".
Reset command. Brings the power supply to a safe and known state:
Output voltage: zero, Remote: non-latched remote,
Output current: zero, Auto-start: Off,Output: Off,OVP: maximum,
FOLD: Off,UVL: zero
The conditional registers (FLT and STAT) are updated, the other registers are not changed.
Sets the power supply to local or remote mode:
1. RMT 0 or RMT LOC, sets the power supply into Local mode.
2. RMT 1 or RMT REM, sets the unit into remote mode.
3. RMT 2 or RMT LLO, sets the unit into Local Lockout mode (latched remote mode).
Returns the Remote mode setting:1.”LOC”-The unit is in Local mode.
2.”REM”-The unit is in Remote mode.
3.”LLO”-The unit is in Local Lockout (latched remote) mode.

6-6-3. ID control commands
No.

Command

1

IDN?

2
3

REV?
SN?

Description
Returns the power supply model identification as an ASCII string.
Returns the software version as an ASCII string.
Returns the unit serial number. Up to 12 characters.

6-6-4. Output control commands
No.

Command

1

PV n

2

PV?

3

MV?

4

PC n

5

PC?

6

MC?

7

OUT n

8

OUT?

9

FLD n

10

FLD?

Description
Sets the output voltage value in Volts. The range of voltage value is described in Table
7-3. The maximum number of characters is 12. See the following examples for PV nformat: PV 12, PV 012, PV 12.0, PV 012.00, etc....
Reads the output voltage setting. Returns the string “n” where “n” is the exact string sentin the PV n command. When in Local mode, returns the V/I CHK (front panel) settings in a
5 digits string.
Reads the actual output voltage. Return 5 digits string.
Example: 60V supply sends 01.150, 15.012, 50.000, etc...
Sets the output current value in Amperes. The range of current values is described inTables 7-4. The maximum number of characters is 12. See the following examples for
PC n format: PC 10, PC 10.0, PC 010.00, etc...
Reads the output current setting. Returns the string “n” where “n” is the exact string sent in
the PC n command. When in Local mode, returns the V/I CHK (front panel) settings in a 5
digits string.
Reads the actual output current. Returns 5 digits string.
Example: 90A supply sends 90.000.
Turns the output to ON or OFF. Recover from Safe-Start, OVP or FLD fault.
OUT 1(or OUT ON)-Turn On.
OUT 0(or OUT OFF)-Turn Off.
Returns the output On/Off status string.
ON-output on.
OFF-output off.
Sets the Foldback protection to ON or OFF.
FLD 1(or FOLD ON)-Arms the Foldback protection.
FLD 0(or FOLF OFF)-Cancels the Foldback protection.
When the Foldback protection has been activated, OUT 1 command will release theprotection and re-arm it, while FLD 0 will cancel the protection.
Returns the Foldback protection status string:“ON”-Foldback is armed, “OFF”-Foldback is canceled.

43

No.

Command

11

OVP n

12

OVP?

13

OVM

14

UVL n

15

UVL?

16

ASTn

17

AST?

18

SAV

19

RCL

20

MODE?

Description
Sets the OVP level.
◆ The OVP setting range is given in Table 6-6.
The number of characters after OVP is up to 12.
The minimum setting level is 5% of full rating plus the output voltage set value.
Attempting to program the OVP below this level will result in execution error response(“E04”). The OVP setting stays unchanged.
Returns the setting “n” where “n” is the exact string in the user’s “OVO n”. When in Local
mode, returns the last setting from the front panel in a 4 digit string.
Sets OVP level to the maximum level.
◆ Refer to Table 6-6.
Sets Under Voltage Limit. Value of “n” may be equal to PV setting, but returns “E06” ifhigher.
◆ Refer to Table 6-7 for UVL programming range.
Returns the setting “n” where “n” is the exact string in the user’s “UVL n”. When in Local
mode, returns the last setting from the front panel in a 4 digit string.
Sets the auto-restart mode to ON or OFF.
AST 1 (or AST ON)-Auto restart on.
AST 0 (or AST OFF)-Auto restart off.
Returns the string auto-restart mode status.
“ON”-Auto restart is on.
“OFF”-Auto restart is off.
Saves present settings. The settings are the same as power-down last settings.
These settings are erased when the supply power is switched off and the new “last settings”
are saved.
Recalls last settings.
Settings are from the last power-down or from the last “SAV” command.
Returns the power supply operation mode. When the power supply is ON (OUT 1) it will
return “CV” or “CC”. When the power supply is OFF (OUT 0) it will return “OFF”.

6-6-5. Global output commands
All supplies, even if not the currently addressed supply, receiving a global command will execute the command.
No response to the PC issuing the command will be returned to the PC. The PC is suing the command will be
responsible to delay and any other communications until the command is execute. 200 Ms minimum is thesuggested delay. If the command contains an error, out of range values for example, no error report will be sent to
the issuing PC.
No.

Command

1

GRST

2

GPV n

3

GPC n

4

GOUT

5

GSAV

6

GRCL

Description
Reset. Brings the power supply to a safe and known state:
Output voltage: 0V, output current: 0A, out: OFF, Remote: RMT 1’
AST: OFF
PVP: Max.
UVL: 0The conditional register (FLT and STAT) are updated. Other registers are not changed.
Non-Latching faults (FB, OVP, SO) are cleared, OUT fault stays.
Sets the output voltage value in volts. The range of voltage values is shown in Table 6-3 ‘n’
may be up to 12 char plus dec. pt
Program the output current value in amperes. The range of current values is shown in Table
6-4 ‘n’ may be up to 12 char plus dec. pt
Tums the output to ON or OFF:“OUT 1/ON”= turn on“OUT 0/OFF”= turn off, clears CV and CC bits in the Status Condition (STAT)OUT ON will respond with “E07” if the output can not be turned on because of a latching fault(OTP < AC, ENA, SO) shut down.
Save present settings.
Same settings as power-down last settings listed in Error! Reference source not found.
Except the address and baud rate are not saved. Saves to the RAM. These settings are
erased when the supply power is switched off and the new ‘last settings’ are saved.
Recall last settings. Settings are from last power-down or from last ‘SAV’ or ‘GSAV’ command.
Address and baud rate are not recalled so communication is not interrupted.

44

Table 6-3: Voltage programming range
Rated Output
Minimum (V)Maximum (V)Voltage (V)60.00006.0000
0.000
8.000
8

Table 6-4: Current programming range
Model

Minimum(A)Maximum(A)PU6-200

000.00200.00

PU8-180000.00180.0012.5
00.00012.500PU12.5-120000.00120.002000.00020.000PU20-76
00.00
76.00
30
00.00030.000PU30-5000.00050.0004000.00040.000PU40-3800.00038.00060
00.00060.000PU60-2500.00025.000
80
00.00
80.00
PU80-1900.00019.000100
000.00100.00
PU100-1500.00015.000150
000.00150.00
PU150-1000.00010.000300
000.00300.00PU300-5
0.000
5.000
600
000.00600.00PU600-2.6
0.000
2.600
※ The power supply can accept values higher about 5% than the table values, however it is not recommended toprogram the power supply over the rated values.
Table 6-5: OVP programming range
Rated Output
Minimum (V)Maximum (V)Voltage (V)
6
0.5
7.50
8
0.5
10.0
12.5
1.0
15.0
20
2.0
24.0
30
2.0
36.0
40
2.0
44.0
60
5.0
66.0
80
5.0
88.0
100
5.0
110
150
5.0
165
300
5.0
330
600
5.0
660

Table6-6: UVL programming range
Rated Output
Minimum(A)Maximum(A)Voltage (V)
6
0
5.70
8
0
7.60
12.5
0
11.9
20
0
19.0
30
0
28.5
40
0
38.0
60
0
57.0
80
0
76.0
100
0
95.0
150
0
142
300
0
285
600
0
570

6-6-6. Status control commands◆ Refer to "6-7. Status, error and SRQ registers".
#
Command

1

STT?

2
3
4
5
6
7
8
9

FLT?
FENA
FENA?
FEVE?
STAT?
SENA
SENA?
SEVE?

Description

Reads the complete power supply status.
Returns ASCII characters representing the following data, separated by commas:
MV<actual (measured) voltage>
PC<programmed (set) current>
PV<programmed (set) voltage >SR<status register, 2-digit hex>
MC<actual (measured) current>
FR<fault register, 2-digit hex>
Example response: MV(45.201), PV(45), MC(4.3257), PC(10), SR(30), FR(00)
Reads Fault Conditional Register. Return 2-digit hex.
Set Fault Enable Register using 2-digit hex.
Reads Fault Enable Register. Returns 2-digit hex.
Reads Fault Event Register. Returns 2-digit hex. Clears bits of Fault Event Register.
Reads Status Conditional Register. Returns 2-digit hex.
Set Status Enable Register using 2-digit hex.
Reads Status Enable Register. Returns 2-digit hex.
Reads Status Event register. Returns 2-digit hex. Clears bits of Status Event resister.

45

6-7. Status, error and SRQ registers
This section describes the various status error and SRQ registers structure. The registers can be read or set via theRS232/485 commands. When using the GP-IB option, refer to the user manual for PU Power Supply GP-IB
Programming interface.
◆ Refer to Fig.6-7 for the Status and Error Registers Diagram.
Command Error (“Cnn”)
Execution Error (“Enn”)
Query Response (“message”)
Command Response (“OK”)

One response every commandor query received
OR

Response
Messages

Status Registers
Constant Voltage
Constant Current
No Fault
Fault
Auto Start
Fold Enabled
Spare
Local Mode

LSB

Condition
CV
CC
2
NFLT
3
FLT
4
AST
5
FDE
6
0
7
CLC
0

Enable

1

MSB

0
0
0

Event
CV
CC
NFLT
FLT
0
0
0
CLC

OR

OR

SRQ
Messages“STAT?” “SENA xx” “SAVE?”“SENA?”

Serial TXD

SRQ = “Inn”
nn = address
One SRQ when SEVE goes from all zeroes
to any bit set.
Setting more SEVE bits does not cause
more SRQs.

Positive Logic:
0 = No Event
1 = Event OccuredOR

Fault Registers
LSB
Spare
AC FailOver Temperature
Foldback (tripped)
Over Volt Prot
Shut Off (rear panel)
Output Off (front panel)
MSB
Enable Open

Condition
0
1
AC
2
OTP
3
FLD
4
OVP
5
SO
6
OFF
7
ENA
“FLT?”
0

Enable

Event
0
AC
OTP
FLD
OVP
SO
OFF
ENA
“FEVE?”“FENA xx”
“FENA?”

OR

Fig.6-7: Status and Error Registers Diagram46

6-7-1. Conditional registers
The fault Condition Register and the Status Condition Register are read only registers that the user may read to see
the condition of the supply.
◆ Refer to table 6-8 for description of the Fault Condition Register bits and Table 6-9 for the Status Condition register
bits.
Table 6-8: Fault Condition Register
BIT
Fault nameFault symbol
Bit Set condition
Bit Reset condition0(LSB)
Spare bit
SPARE
Fixed to zero
Fixed to zero1
AC FailAC
AC fail has occurred.
The AC input returns to normal.
OTP shutdown has
The power supply cool down.
2
Over Temperature
OTP
occurred.
Foldback shutdown has The supply output is termed On by front
3
FoldbackFOLD
occurred.
panel button or OUT 1 command.
OVP shutdown has
The supply output is turned On by front
4Over voltage
OVP
occurred.
panel button or OUT 1 command.
Rear panel J1 “Shut Off”
Rear panel J1 “Shut Off” condition
5
Shut OffSO
condition has occurred.
removed.
*1
Front panel OUT button The supply output is turned On by front
6
Output Off
OFF
pressed to Off.
panel button or OUT 1 command.
Rear panel J1 Enable
7(MSB)
EnableENA
terminals (J1-1&J1-14)
Rear panel J1 Enable terminals closed.
opened. *2*1. ◆ Refer to "4-6. Output shut-off (SO) control via rear panel J1 connector".
*2. ◆ Refer to "4-7. Enable/disable control via rear panel J1 connector".

BIT

Fault name0(LSB)

Constant Voltage

1

Constant Current

2

No Fault

3

Fault active

4

Auto-Restart
Enabled

5

Fold Enabled

6

Spare bit

7(MSB)

Local Mode

Table 6-9: Status Condition Register
Fault symbol
Bit Set condition
Bit Reset condition
Output is On and the
Output is ON and the supply is not inCVsupply in CV.
CV.
Output is ON and the
Output is ON and the supply is not inCCsupply in CC.
CC.
The power supply is
One or more faults are active and fault
operating normally or
NFLT
reporting is enabled (using “FENA xx”).
fault reporting is notenabled.
One or more faults are
Fault Event Resister cleared (FEVE?).
FLT
enable and occur.
Supply is in Auto-Restart
Supply is in Safe-Start mode
AST
mode (from Front Panel(from Front Panel or serial command).
or serial command).
Fold protection enabled
Fold protection disabledFDE(from Front Panel or(from Front Panel or serial command).
serial command).
SPARE
Fixed to zero.
Fixed to zero.
Supply in Remote mode or
LCL
Supply in Local mode.
Local-Lockout mode.

47

6-7-2. Service Request: Enable and Event Registers
The conditional Registers are continuously monitored. When a change is detected in a register bit which is enabled,
the power supply will generate an SRQ message.
The SRQ message is: "!nn" terminated by CR, where the nn is the power supply address.
The SRQ will be generated either in Local or Remote mode.
◆ Refer to Tables 6-10 to 6-13 for details of the Enable and Event registers.
1. Fault Enable Register
The Fault Enable Register is set to the enable faults SRQs.

BIT0(LSB)
12
3
4
5
6
7(MSB)

Enable bit nameSpare bit
AC FailOver Temperature
Foldbck
Over Voltage
Shut OffOutput Off
EnableTable 6-10: Fault Enable Register
Fault symbol
Bit Set condition
SPARE
AC
OTP
User command:
FOLD“FENA nn” where nn is
OVP
hexadecimal
SO
OFF
ENA

Bit Reset condition

User command:“FENA nn” where nn is hexadecimal(if nn=”00”, no fault SRQs will be
generated).

2. Fault Event Register
The Fault Event will set a bit if a condition occurs and it is enabled. The register is cleared when FEVE? , CLS
or RST commands are received.

BIT0(LSB)
12
3
4
5
6
7(MSB)

Enable bit nameSpare bit
AC FailOver Temperature
Foldbck
Over Voltage
Shut OffOutput Off
EnableTable 6-11: Fault Event Register
Fault symbol
Bit Set condition
SPARE
AC
Fault condition
OTP
occurs and it is enabled.
FOLD
The fault can set a bit,
OVP
but when the fault clears
SOthe bit remains set.
OFF
ENA

Bit reset condition

Entire Event Register is cleared whenuser sends “FEVE?” command toread the register.
“CLS” and power-up also clear the Fault
Event Register.

3. Status Enable register
The Status Enable Register is set by the user to enable SRQs from changes in power supply status.

BIT
0(LSB)
12
3
4
5
6
7(MSB)

Status nameConstant Voltage
Constant Current
Not Fault
Fault active
Auto-RestartenabledFold enabled
Spare
Local Mode

Table 6-12: Status Enable Register
Status symbol
Bit Set condition
Bit reset condition
CV
User command:User command:“SENA nn” is received, where nn is
CC“SENA nn” is received,
Hexadecimal bits.
NFLT
where nn is hexadecimal
If “nn”=00, no SRQ is sent where there
bits.
FLT
is a change in Status Condition Register.
AST
FDE
SPARE
LCL

Always zero

Always zero

Always zero
Always zero
“SENA nn” command

Always zero
Always zero
“SENA nn” command48

4. Status Event Register
The Status Event Register will set a bit if a change in the power supply status occurs and it is enabled.
The register is cleared when the "SEVE?" or "CLS" commands are received. A change in this register will
generate SRQ.
Table 6-13: Status Event Register
BIT

Status name

Status symbol

Bit Set condition0(LSB)

Constant Voltage

CV

Changes in Status
occurs and it is enabled.
The change can set a bit,but when the change
clears the bit remains set.

1

Constant Current

CC

2

No Fault

NFLT

3

Fault active

FLT

4

Not used0

Always zero5

Not used0

Always zero6

Not used0

Always zero

LCL

Unit is set to Local bypressing front panel
RMT/LCL button.

7(MSB)

Local Mode

Bit reset condition

Entire Event Register is cleared whenuser sends “SEVE?” command to readthe register.
“CLS” and power-up also clear the
Status Event Register.

6-8. Serial communication test set-up
Use the following instructions as basic set-up to test the serial communication operation.
1. Equipment: PC with Windows Hyper Terminal, private edition, software installed, PU power supply, RS232 cable.
2. PC set-up:

2.1 Open Hyper Terminal
2.2 Enter a name
2.3 Connect to
2.4 Configure port properties

New Connection.
Direct to Com1 or Com 2
Bits per second
Data bits
ParityStop bits
Flow control

2.5 Open Properties in the program File
2.6 Setting:

9600
8
None
1
None
Properties

ASCII Set Up
Select Echo characters locally, select send line ends with line feed.
On some PC systems, pressing the number keypad "Enter" will distort displayed
messages. Use the alphabetic "Enter" instead.

3. Power supply set-up:
3.1 Connect the power supply to the PC using the RS232 cable.
3.2 Set via the front panel: Baud Rate: 9600, Address: 06.
3.3 Set via the rear panel: RS232/485 to RS232◆ Refer to "3-3. SW1 setup switch"..
4. Communication Test:
4.1 Model identification:
PCwrite: ADR 06
Power supply response: "OK"4.2 Command test:
PCwrite: OUT1Power supply response: "OK"
PCwrite: PV nPower supply response: "OK"
PCwrite: PC n (for n values see Tables 6-4 and 6-6)
Power supply response: "OK"The power supply should turn on and the display will indicate the output voltage and the actual output current.

49

7. ISOLATED ANALOG PROGRAMMING OPTION
Isolated Analog Programming is an internal option card for analog programming of the PU power supply series.
The option is factory installed and cannot be obtained with GPIB (GP-IB) Interface. Output Voltage and Current Limit
can be programmed and readback through optically isolated signals which are isolated from all other groundreferences in the power supply.
There are two types of Isolated Analog programming cards:
1. 0V to 5V/0V to 10V option: Using 0V to 5V or 0V to 10V signals for programming and readback.
2. 4mA to 20mA option: Using current signals for programming and readback.

7-1. Specivivations
7-1-1. 0V to 5V/0V to 10V option
Programming
InputsMonitoring
Outputs

Output voltage programming accuracy%±1

Output current programming accuracy%±1

Output voltage programming temperature coefficient

ppm/°C±100

Output current programming temperature coefficient

ppm/°C±100

Input impedanceΩ

1M

Absolute maximum voltage

Vdc

0 to 15

Max. voltage between program inputs and supply outputs

Vdc

600

Output voltage monitoring accuracy

%

±1.5

Output current monitoring accuracy

%

±1.5

Output impedance (see note)Ω

100

Max. voltage between monitoring outputs and supply outputs

Vdc

600

NOTE:
Use 100kΩ minimum input impedance for the monitoring circuits to minimize the readback error.

7-1-2. 4mA to 20mA option
Programming
InputsMonitoring
Outputs

Output voltage programming accuracy%±1

Output current programming accuracy%±1

Output voltage programming temperature coefficient

ppm/°C±200

Output current programming temperature coefficient

ppm/°C±200

Input impedanceΩ

50

Absolute maximum input current

mA

0 to 30

Max. voltage between program inputs and supply outputs

Vdc

600

Output voltage monitoring accuracy

%

±1.5

Output current monitoring accuracy

%

±1.5

Maximum load impedanceΩ

500

Max. voltage between monitoring outputs and supply outputs

Vdc

600

50

7-2. Isolated programming and monitoring◆ Refer to Table 7-1 for detailed description of the rear panel Isolated Programming & Monitoring connector.
To provide the lowest noise performance, it is recommended to use shielded-twisted pair wiring.
◆ Refer to Fig.7-1 for description of the connector.
Isolated programming plug P/N: MC1.5/8-ST-3.81, Phoenix.

Fig.7-1: Isolated Programming & Monitoring connector

Terminal

1

Table 7-1: Detailed description of Isolated programming & Monitoring connector
Range
Rang
Signal name
Function
0V to 5V/0V to 10V
4mA to 20mA IS420
IS510 option
optionShield, connected internally to
SHLD
Chassis groundchassis of the supply.

2+VPROG_ISO

Output voltage programming input

0V to 5V/0V to 10V

4mA to 20mA

3

+IPROG_ISO

Output current programming input

0V to 5V/0V to 10V

4mA to 20mA

4

GND

Ground for programming signals.

GroundGround5

GND

Ground for programming signals.

GroundGround6+VMON_ISO

Output voltage monitoring output

0V to 5V/0V to10V

4mA to 20mA

7

+IMON_ISO

Output current monitoring output

0V to5V/0V to 10V

4mA to 20mA

8

SHLD

Shield, connected internally tochassis of the supply.

Chassis ground

When the Isolated Analog Option is installed, do not apply any signals to the
non-isolated VPGM and IPGM (J1-9 and J1-10) pins. All other J1 features may be
used normally.
◆ Refer to "3-4. J1 programming and monitoring connector" for a description of J1
features.

51

7-3. Setup and operating instructions

To prevent damage to the unit, do not program the output voltage and current tohigher then the power supply rating.

7-3-1. Setting up the power supply for 0V to 5V/0V to 10V Isolated Programming and Monitoring
Perform the following procedure to configure the power supply:
1. Turn the power supply AC power switch to off.
2. Connect a short between J1-8 and J1-12.
3. Set the Setup switch SW1 positions 1 and 2 to their Up position.
4. Set SW1position 3 to select the programming voltage range: Down=0V to 5V, Up=0V to 10V.
5. Set SW1position 4 to select the monitoring range: Down=0V to 5V, Up=0V to 10V.
6. Ensure that SW1positions 7 and 8 are in their down position.
7. Connect the programming sources to the mating plug of the Isolated Programming connector. Observe forcorrect polarity of the voltage source.
8. Set the programming sources to the desired levels and turn the power supply ON.

J1-8 and J1-12 must be shorted together with a jumper.

7-3-2. Setting up the power supply for 4mA to 20mA Isolated Programming and Monitoring
Perform the following procedure to configure the power supply:
1. Turn the power supply AC power switch to off.
2. Set the Setup switch SW1positions 1 and 2 to their Up position.
3. Set SW1position 3 to it's up position.
4. Set SW1position 4 to it's up position.
5. Ensure that SW1positions 7 and 8 are in their Down position.
6. Connect the programming source to the mating plug of the Isolated Programming connector.
Observe for correct polarity of the voltage source.
7. Set the programming sources to the desired levels and turn the power supply ON.

SW1 position 3 and 4 must be in their Up position for operation with 4mA to 20mA
Isolated Programming and monitoring.

52

8. MAINTENANCE
This chapter provides information about maintenance, calibration and troubleshooting.

8-1. Units under warranty
Units requiring repair during the warranty period should be returned to a our authorized service facility. Refer to theaddresses listing on the back cover of this manual. Unauthorized repairs performed by other than the authorized
service facilities may void the warranty.

8-2. Periodic maintenanceNo routine maintenance of the power supply is required except for periodic cleaning. To clean, disconnect the unit
from the AC supply and allow 30sec. for discharging internal voltage. The front panel and the metal surfaces should
be cleaned using mild solution of detergent and water. The solution should be applied onto a soft cloth, and not
directly to the surface of the unit. Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. Use lowpressure compressed air to blow dust from the unit.

8-3. Adjustments and calibration
No internal adjustment or calibration is required. There is NO REASON to open the power supply cover.

8-4. Parts replacement and repairs
As repairs are made only by the manufacturer or by authorized service facilities, no parts replacement information isprovided in the manual. In case of failure, unusual or erratic operation of the unit, contact a our sales or service
facility nearest you. Please refer to the our sales offices addresses listing on the back cover of this user manual.

8-5. Fuse rating
There are no user replaceable fuses in the power supply. Internal fuses are sized for fault protection and if a fuse
was opened it would indicate that service is required. Fuse replacement should be made by qualified technicalpersonnel.
Table 8-2: Internal fuses
Fuse designation
F301
F302,F304
F31,F32

1500W model
30A 250VAC, TIME DELAY
2A 400VDC, NORMAL
20A 250VAC, FAST53APPENDIX A TROUBLESHOOTING
If the power supply appears to operating improperly, use the troubleshooting guide to determine whether the power
supply, load or external control circuit are the cause. Configure the power supply for basic front panel operation andperform the tests of "2-9. Turn-on checkout procedure" to determine if the problem is with the supply.
Table A-1 provides the basic checks that can be performed to diagnose problems, and references to sections of thismanual for further information.
Table A-1: Troubleshooting guide
SYMPTOMCHECK
Is the AC power cord defective?

No output. All displays andindicators are blank.

Is the AC input voltage within range?

Output is present momentarily but
shuts off quickly.
The display indicates “AC”.

Does the AC source voltage sag when load
is applied?

Output is present momentarily but
shuts off quickly.
The display indicates “OUP”.

Is the power supply configured toRemote sense?

Output voltage will not adjust.
Front panel CC LED is on.

Is the unit in constant current mode?

Output voltage will not adjust.
Front panel CV LED is on.

Check if output voltage is adjusted above OVP
setting or below UVL setting.

Output current will not adjust.
Front panel CV LED is on.

Is the unit in constant voltage mode?

Large ripple present in output.

Is the power supply in remote sense?
Is the voltage drop on the load wire high?

No output. Display indicates“OUP”

Over Voltage Protection circuit istripped.

Display indicates “ENA”

No output. Front panel
ALARM LED is blinking.

Display indicates “SO”

Display indicates “OTP”
Display indicates “Fb”
Poor Load regulation Front panel
CV LED is on

Are sensing wires connected properly?

The front panel controls are
nonfunctional.

Is the power supply in Local-Lockout mode?

54

ACTION
Check continuity, replace if necessary.
◆ Refer to "2-8. AC input power connection".
Check input AC voltage.
Connect to appropriate voltage source.
◆ Refer to"2-7. AC source requirements","2-8. AC input power connection".
Check input AC voltage.
Connect to appropriate voltage source.
◆ Refer to "2-7. AC source requirements".
Check if the positive or negative load wire is loose.
◆ Refer to"2-10-6. Making the load connections","2-10-8. Connecting single loads, remote sensing"
Check current limit setting and load current.
◆ Refer to"4-1-1. Constant Voltage Mode""4-1-2. Constant Current Operation"
Set OVP or UVL so they will not limit the output.
◆ Refer to"4-2. Over voltage protection (OVP)""4-3. Under voltage limit (UVL)"
Check current limit and voltage setting.
◆ Refer to "4-1. Standard operation"
Check load and sense wires connection for noise
and impedance effects.
Minimize the drop on the load wires.
◆ Refer to"2-10-4. Noise and Impedance Effects""2-10-8. Connecting single loads, remote sensing"
Turn off the Ac power switch.
Check load
connections. If analog programming is used,check if the OVP is set lower than the output.
◆ Refer to "4-2. Over voltage protection (OVP)"Check rear panel J1 ENABLE connection.
◆ Refer to"4-7. Enable/disable control via rear panel J1
connector"
Setup switch SW1 setting.
◆ Refer to "3-3. SW1 setup switch".
Check rear panel J1.
Output Shut-Off connection.
◆ Refer to"4-6. Output shut-off (SO) control via rear panel
J1 connector"
Check if air intake or exhaust are blocked.
Check if the unit is installed adjacent to heatgenerating equipment.
Check Foldback setting and load current.
◆ Refer to "4-4. Foldback protection".
Connect the sense wires according to User’s
manual instructions.
◆ Refer to"2-10-8. Connecting single loads, remote sensing"
Turn Off the AC power and wait unit the display
turns off. Turn on the AC power and press front
panel REM/LOC button.
◆ Refer to"6-1-5. Setting the unit into Remote or Local mode".

21.0

43.6

APPENDIX B PU 1500W POWER SUPPLIES OUTLINE DRAWINGS55

APPENDIX C SPECIFICATIONS
Output rating
MODEL

6-200

8-180

12.5-120

20-76

30-50

40-38

60-25

80-19

100-15150-10300-5600-2.6

1.Rated output voltage(*1)

V

6

8

12.5

20

30

40

60

80

100

150

300

600

2.Rated output current 1500w(*2)

A

200

180

120

76

50

38

25

19

15

10

5

2.6

3.Rated output power 1500w

W

1200

1440

1500

1520

1500

1520

1500

1520

1500

1500

1500

1560

V

6

8

12.5

20

30

40

60

80

100

150

300

600

84/88

84/88

84/88

84/88

100

150

300

600

Input characteristics
1.Input voltage/freq.(*3)-

85VAC to 265VAC continuous,47Hz to 63Hz,single phase.

2.Input current(at 100VAC/200VAC)

A

21 (AC100V) /11 (AC200V) for 1500W models.

3.Power Factor-

4.1500W models Efficiency (*4)%

5.Inrysh current at 100V/200V

A

0.99 @100VAC/200VAC, rated output power.
77/79

78/81

82/85

83/86

83/86

84/88

84/88

84/88

Less than 50A for 1500W models.

Constant voltage mode
V

6

8

12.5

20

30

40

60

80

1. Max. Line regulation (*5)-

0.01% of rated output voltage ＋2mV

2. Max. Load regulation (*6)-

0.01% of rated output voltage ＋2mV

3. Ripple and noise (p-p,20MHz)(Following 30 minutes warm-up)
4. Ripple r.m.s.,5Hzto1MHz(Following 30 minutes warm-up)
5. Temperature coefficient

mV

60

60

60

60

60

60

60

80

80

100

150

300

mV

8

8

8

8

8

8

8

8

8

10

25

60

5

5

ppm/°C

6. Temperature drift-

7. Rem. sense compensation/wireV

8. Up-prog.response time,0 to Vomax(*9)
9. Down-prog.response time

100ppm/°C from rated output voltage,following,30 minutes warm-up.
0.05% of rated Volt over 8hours interval following 30 minutes warm-up.
1

1

ms

Full load

ms

10

ms

500

ms

11.Hold-up time

ms

1

1.5

2

90

No load10.Transient response time

1

700

Constant line, load & temp.

4

5

120

50
600

3

150

80
900

1000

1100

5

250

150
1200

1400

1700

250
2400

Time for the output voltage to recover within 0.5% of its rated output for a load change 10% to 90% of rated output current.
Less than 1m.s, for models up to and including 100V. 2m.s, for models above 100.
More than 20m.s, 100Vac, rated output power.

56

3000

4800

Output set-point:10% to 100%

Constant current modeV
1. Max. Line regulation (*5)-

2. Max. Load regulation (*7)-

3.Ripple r.m.s 5Hz to 1MHz (*8)

mA

4.Temperature coefficient

6

8

12.5

20

40

60

80

100

150

300

600

45

35

25

12

0.01% of rated output current ＋2mA
0.02% of rated output current ＋5mA
400

360

240

152

ppm/°C

5.Temperature drift

30

125

95

75

57

100 ppm/°C from rated output current, following 30 minutes warm-up.

-

0.05% of rated lout over 8hours interval following 30 minutes warm-up.

Constant line, load & temp.

Analog programming and monitoring
1.Vout voltage programming--

2.Iout voltage programming--

0% to 100%, 0V to 5V / 0V to 10V, user select, Accuracy and linearity:±0.5% of rated Volt.
0% to 100%, 0V to 5V / 0V to 10V, user select, Accuracy and linearity:±1% of rated Iout.

3.Vout resistor programming--

0% to 100%, 0kΩ to 5kΩ/ 0kΩ to 10kΩ full scale, user select, Accuracy and linearity:±1% of rated Volt.

4.Iout resistor programming--

0% to 100%, 0kΩ to 0kΩ to 5kΩ/0kΩ to 10kΩfull scale, user select, Accuracy and linearity:±1.5% of rated Iout.

5.ON/OFF control--

By electrical Voltage: 0V to 0.6V/2V to 15V, or dry contact, user selectable logic.

6.Output current monitor--

0V to 5V or 0V to 10V、user selectable. Accuracy:1%.

7.Output voltage monitor--

0V to 5V or 0V to 10V、user selectable. Accuracy:1%.

8.Power supply OK signal--

4V to 5V OK, 0V-Fail.

9.Parallel operation (*10)--

Possible, up to 4 units in master/slave mode with single wire current balance connection.

500ohm series resistance.

10.Series operation--

Possible (with external diodes), up to 2 units.

11.CV/CC indicator--Open Collector. CC mode: On, CV mode: Off. Maximum voltage: 30V, maximum sink current: 10mA

12. Enable/Disable--

Dry contact.

13.Local/Remote analog Control--

By electrical signal or Open/Short: 0V to 0.6V or short: Remote, 2V to 15V or open: Local

14.Local/Remote analog Indicator--Open collector, Local: Open, Remote: On, Maximum voltage: 30V, maximum sink current: 10mA.

Open: off, Short: on.

Max. Voltage at Enable/Disable in: 6V.

Output rating and readback (RS232/485,Optional GP-IB Interface) (At the time of 23°C ±5°C)
1.Vout programming accuracy--

0.1% +0.05% of rated output voltage

2.Iout programming accuracy--

0.1% +0.15% of rated output current

3.Vout programming resolution--

0.012% of full scale

4.Iout programming resolution--

0.012% of full scale

5.Vout readback accuracy--

0.1% + 0.15% of rated output voltage

6.Iout readback accuracy--

0.1% + 0.35% of rated output current

7.Vout readback resolution--

0.012% of full scale

8.Iout readback resolution--

0.012% of full scale

57

Protective functions
V

6

8

12.5

20

30

40

60

80

100

150

300

600

5 to 110

5 to 165

5 to 330

5 to 660

1. Foldback protection--

Output shut-down when power supply change from CV to CC User presetable.

2. Over-voltage protection--

Inverter shut-down, manual reset by AC input recycle or by OUT button or by communication port command.

3. Over-voltage trip point

V

0.5 to 7.5

4. Output under voltage limit--

Preset by front panel or communication port.

5.Over temperature protection--

User selectable, latched or non latched.

--

Vout/Iout manual adjust by separate encoders(coarse and fine adjustment).

0.5 to 10

1 to 15

1 to 24

2 to 36

2 to 44

5 to 66

5 to 88

Prevents from adjusting Vout bellow limit.

Front panel
1.Contlol functions

2. Display
3. Indications--

Encoder is precisely switch able.

--

OVP/UVL manual adjust by Vout.

--

Address selection by Voltage Adjust encoder. No of addresses:31--

Go to local control.

--

Output on/off--

AC on/off--

Front panel Lock

Adjust encoder.

--

Foldback control--

Baud rate selection: 1200, 2400, 4800, 9600, and 19200.

--

Re-start modes (automatic restart, safe mode).

--

Vout:

4 digits, accuracy: 0.5% rated output voltage ±1count.

--

Iout:

4 digits, accuracy: 0.5% rated output current ±1count--

VOLTAGE,CURRENT,ALARM,FINE,PREVIEW,FOLDBACK,LOCAL,OUTPUT ON

Environmental conditions
1.Operating temperature--

0°C to 50°C,100% load.

2. Storage temperature---20°C to 70°C

3. Operating humidity--

30% to 90% RH (no condensation)

4. Storage humidity--

10% to 95% RH (no condensation)

5. Altitude--

Maximum 3000m.

Derate output current by 2%/100m above 2000m.

ambient temperature by 1°C /100m above 2000m.

58

Alternatively, derate maximum

Mechanical
1. Cooling--

Forced air cooling by internal fans.

2. Weight

Kg

Less than 8.5kg

3. Dimensions(W×H×D)

mm

W:422.8、H:43.6、D:432.8 ( Refer to Outline drawing )Safety/EMC
1.Applicable standards:

Designed to meet EN61010-1

SafetyVout≤60V: Output is Non Hazardous, GP-IB/Isolated analog are Non Hazardous.
--

60<Vout=400V: Output is hazardous, GP-IB/Isolated analog are Non Hazardous.
400<Vout=600V: Output is hazardous, GP-IB/Isolated analog are Hazardous.

EMC

EN55035

2.Withstand voltage

Vout≤40V models: Input-Outputs (Non Hazardous): 4242VDC 1min, Input-Ground: 2828VDC 1min,
40<Vout≤150V models: Input- Output (Hazardous.): 3425VDC 1min, Output (Hazardous.)-Ground: 1414VDC 1min,--

Input-Non Hazardous: 4242VDC

1min,Output (Hazardous.)-Non Hazardous: 2307VDC 1min, Input-Ground: 2828VDC 1min.
150<Vout≤600V models: Input- Output (Hazardous.): 3490VDC 1min, Output (Hazardous.)-Ground: 2738VDC 1min, Input-Non Hazardous: 4242VDC
1min,Output (Hazardous.)-Non Hazardous: 4242VDC 1min, Input-Ground: 2828VDC 1min.

3.Insulation resistance--More than 100Mohm at 25°C、70%RH

4.Conducted emission--

EN55032

5.Radiated emission--

EN55032

Notes：*1: Minimum voltage is guaranteed to maximum 0.2% of the rated output voltage.
*2: Minimum current is guaranteed to maximum 0.4% of the rated output current.
*3: For cases where conformance to various safety standards (UL, IEC etc.) is required, to be described as 100Vac to 240Vac (50Hz/60Hz).
*4: At 100V/200V input voltage and maximum output power.
*5: From 85Vac to 132Vac or 170Vac to 265VAC, constant load.
*6: From No-load to Full-load, constant input voltage.

Measured at the sensing point in Remote Sense.

*7: For load voltage change, equal to the unit voltage rating, constant input voltage.
*8: For 6V models the ripple is measured at 2V to 6V output voltage and full output current.

For other models, the ripple is measured at 10% to 100% output voltage and full output current.

*9: With rated, resistive load.
*10: When parallel operation exceeding four sets is required, please contact to our company.

Supplemental characteristics
The supplemental characteristics data is held in each our sales and service facility. For further details please contact the our office nearest you.

59

APPENDIX D ACCESSORIES
Accessories

PU6-200

PU8-180

PU12.5-120

PU20-76

PU30-50

PU40-38

PU60-25

PU80-19

PU100-15

PU150-10

PU300-5

PU600-2.6

terminal

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M3x8
Flat Head screws

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●

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strain relief

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AC input cover

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D-SUB25pin
connector set（749809-9, AMP）

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linking cable※1

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output terminal
shield coverscrews for
output terminal
shield cover

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Nut set

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－

－

－

－

－

－

－

－

－

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－

－

－

－

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output terminal－－
protect coverscrew for
output terminal－－
protect cover※1: Only the linking cable is individually sold.

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terminal

M3x8 Flat Head screws

strain relief

D-SUB25pin connector set

linking cable

output terminal shield covernut setoutput terminal protect coverscrew for output terminal protect cover

CAUTION: The form of accessories varies according to a model.

61

AC input coverscrews for output terminal shield cover7F Towa Fudosan Shin Yokohama Bldg.
2-18-13, Shin Yokohama, Kohoku-ku,Yokohama, Kanagawa, 222-0033 Japan
http://www.texio.co.jp/