INSTRUCTION MANUALREGULATED DC POWER SUPPLY
PA-B SERIES
PA10-5B
PA18-1.2B PA18-2B
PA18-3B
PA18-5B
PA36-1.2B
PA36-2B
PA36-3B
PA80-1B
PA120-0.6B PA160-0.4B PA250-0.25B
PA250-0.42B PA350-0.2B PA600-0.1B

B71-0116-30

CONTENTS
USING THE PRODUCT SAFELY ................................................................... Ⅰ-Ⅴ
1．OUTLINE AND FEATURES .............................................................................. 1
2．SPECIFICATIONS ............................................................................................ 2
3. INSTRUCTIONS ON USE ............................................................................... 10
3-1. Checking Source Voltage ......................................................................................... 10
3-2. Connection of Power Cable ...................................................................................... 10
3-3. Precautions for Connecting Output Terminals ........................................................ 10
3-4．Switches on Front Panel and Connection Terminals on Rear Panel ................... 11
3-5．Digital Display ............................................................................................................ 11
3-6. Switching Points of Relay.......................................................................................... 11
3-7. Installation Environments .......................................................................................... 12
3-8. Rack Mounting ........................................................................................................... 13
3-9. Options........................................................................................................................ 13
4．PANEL EXPLANATION .................................................................................. 14
4-1. Front panel.................................................................................................................. 15
4-2. Rear panel .................................................................................................................. 18
5. OPERATION PROCEDURES ......................................................................... 20
5-1．Independent Operation............................................................................................. 20
5-2．Remote Sensing........................................................................................................ 20
5-3．OVP ............................................................................................................................ 21
5-4．Remote Control Functions ....................................................................................... 22
5-5．Output ON/OFF Remote Control............................................................................. 24
5-6．Constant-Voltage Remote Control........................................................................... 25
5-7．Constant-Current Remote Control .......................................................................... 28
5-8．Status Signals ............................................................................................................ 31
5-9. Monitoring Voltage and Current................................................................................ 32
5-10．Series and Parallel Connections ........................................................................... 33
5-11．One-Control Parallel Operation.............................................................................. 35
5-12．Recharging Battery ................................................................................................ 37
6. TROUBLES AND PHENOMENA .................................................................... 38
７．EXTERNAL DIMENSIONS FIGURE .............................................................. 39

Permission from the copyright holder is needed to reprint the contents ofthis manual, in whole or in part. Be aware that the product specifications
and the contents of this manual are subject to change for the purpose of
improvement.
The latest version of the instruction manual is posted on our website(https://www.texio.co.jp/download/).
In order to be environmentally friendly and reduce waste, we are gradually
discontinuing the use of paper or CD manuals that come with our
products.
Even if there is a description in the instruction manual that the product isincluded, it may not be included.

This instruction manual applies to fifteen models: PA10-5B, PA18-1.2B,
PA18-2B, PA18-3B, PA18-5B, PA36-1.2B, PA36-2B, PA36-3B, PA80-1B,
PA120-0.6B, PA160-0.4B, PA250-0.25B, PA250-0.42B, PA350-0.2B, andPA600-0.1B.
The operation procedures, etc. described in this manual are common to
all models, except some difference in the specifications. Please refer tothe descriptions about the purchased model.

3

USING THE PRODUCT SAFELY■ Preface
To use the product safely, read this manual to the end. Before
using this product, understand how to correctly use it.
If you read this manual but you do not understand how to use it,call the company that is indicated on the back cover of thismanual. After you read this manual, keep it so that you can readit anytime as required.
■ Notes on reading this manual
The contents of this manual include technical terms in part of their
explanation.
If you do not understand those terms, do not hesitate to ask thecompany or each distributor.
■ Pictorial indication and warning character indication
This manual 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><Warning characterIndication>

Some part of this product or the manual may show
this pictorial indication. In this case, if the productis 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 this manual.

WARNING

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

CAUTION

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

Please acknowledge beforehand that our company does not assume
the responsibility at all except when the liability for damage in the law
is admitted for the user or the third person’s misuse, abuse, neglect,unauthorized product modification or failure to follow this manual, andother troubles, or any damages caused by use of this product.
IUSING THE PRODUCT SAFELYWARNING■ Do not remove the product's covers and panels
Never remove the product's covers and panels for any purpose.
Otherwise, electric shock to the users or a fire may be incurred.
■ Warning on using the product
The warning items given below are to avoid danger to the user's
body and life and avoid the damage and deterioration of the product.
Use the product, observing the following warning and caution items.
■ Warning item on installation environment●Operating temperature
Use the product within the operating temperature indicated in therating column. If the product is used with the vents of the
product blocked or in high ambient temperatures, a fire may occur.
●Operating humidity

Use the product within the operating humidity indicated in therating 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, anelectric shock or fire may occur.
●Use in a gas

Use in and around a place where an inflammable or explosivegas 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 use the product in such an environment.
●Do not let foreign matter in

Do not insert metal and flammable materials into the productfrom its vent and spill water on it. Otherwise, an electric shock
and fire may occur.
IIUSING THE PRODUCT SAFELYWARNING■ Warning about Power Source●Input Power
Check the source voltage before using the PA-B series. The
product has an input voltage selector switch above the AC inlet
on the rear panel. The figure below shows the source voltageof the PA-B series. Note that using the PA-B series on different
voltage may result in a trouble or breakdown. Check the switch,and connect the power cable to the AC outlet.
220V●Power Cable

IMPORTANT: The power cable set supplied with the PA-B series
is unusable for any other product.
Using a power cable not supplied with the PA-B series may resultin electric shocks, electrocution or a fire. If the power cable set
supplied with the PA-B series is damaged, stop using the PA-B
series and contact our distributor. Using the PA-B series withthe damaged power cable may result in electric shocks,
electrocution or a fire. The power cable set supplied with the
PA-B series is to be used for 220 VAC power. Contact the
distributor if you intend to use the PA-B series on input voltage
other than 220 VAC.
●The fuse for protection

The product doesn't operate when the fuse for input protection isblown. Users can replace the fuse by themselves according tosome instructions including cautions and remarks on the user’s
manual. It is important to be very careful to keep the instructions
strictly without fail. Misplacing may cause danger of fire.
III

USING THE PRODUCT SAFELYWARNING■ Warning item on grounding
The product has the GND terminal on the panel surface to protect
the user from electric shock and protect the product. Be sure to
ground the product to safely use it.
■ 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 the power cord plugfrom the outlet. After confirming that no other devices catch fire,
call the company or our distributor.

CAUTION■ Connection of Remote Control Input and Output Terminals*The maximum input rating of the remote control input and output
terminals is determined in order to avoid damages to the
product. Do not input or output voltage/current exceeding therating described in the instruction manual. Excessive input or
output may cause a trouble or breakdown of the product.
*When the voltage or current is controlled according to external
voltage, the negative (-) side of the external voltage unit isconnected with the -S output terminal of the PA-B series. Use
the output circuit of the external voltage unit in the condition
where it is floated from the frame in order to avoid accidents ormalfunctioning.
When several power supply units are used for a remote control
application, each external power supply unit must be floated.
*The negative (-) side of the voltage/current monitor terminal isinternally connected with the -S terminal. Use the input circuitof the external measuring instrument in the condition where it isfloated from the frame in order to avoid accidents ormalfunctioning.
IVUSING THE PRODUCT SAFELYCAUTION■ Input/output terminal
Maximum input to the input terminals is specified to prevent the
product from being damaged.
Do not supply input, exceeding the specifications that are
indicated in the "Rating" or "Caution on use" column in thismanual of the product. Otherwise, a product failure is caused.
Also, do not supply power to the output terminals from theoutside. Otherwise, a product failure is caused.
■ When the product is left unused for a long time
Be sure to remove the power plug from the outlet.

<Calibration>
Although the performance and specifications of the product arechecked under strict quality control during shipment from thefactory, they may slightly change because of secular changes in
its parts. It is recommended to periodically calibrate the productso that it is used with its performance and specifications stable.
For consultation about the product calibration, call the distributoror the company where you bought the product.

<Daily maintenance>

When you clean off the dirt of the product covers, panels, andknobs, avoid solvents such as thinner and benzene. Otherwise,
paint may peel off or the resin surface may be affected.
To wipe off the covers, panels, and knobs, use a soft cloth withneutral detergent in it.
During cleaning, be careful that water, detergents, and otherforeign matters do not get into the product.
If a liquid or metal gets into the product, an electric shock and fireare caused. During cleaning, remove the power cord plug fromthe outlet.
Use the product correctly and safely, observing the above warningand caution items.
Because this 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 content of this manual,
call the distributor or the company.
V1. OUTLINE AND FEATURESThe PA-B series is a high-performance DC constant-voltage, constantcurrent power supply unit with 3 1/2-digit voltage indicator LEDs
and 3-digit current indicator LEDs.
The series regulator control allows the user to vary the output from0 to the rated output. The output controller, a 10-turn winding typevariable resistor, offers fine control of output voltage and current.
It is possible to set the output voltage and current even when the
output is off. The output voltage and current may be checked on
digital indicators simultaneously.
The PA-B series are high-cost-performance power supply units with
output On/Off, output sensing and various remote control functions
and fully meet various users' needs.
They have a wide variety of applications such as power supplies forresearches and development, power supplies for aging, and fixed
power supplies for many systems according to purposes.
- Low-Ripple and Low-Noise Power Supply Unit
The series regulator control system eliminates ripples and noises
to quite low levels and provides low temperature coefficient andsuperior electrical performances.
- Simultaneous Voltage and Current Digital Display LEDs
3 1/2-digit automatic-range voltage indicator LEDs (fixed range
indicators on the PA18-1.2B, PA18-2B, PA18-3B, PA18-5B,
PA120-0.6B and PA160-0.4B) and 3-digit current indicator LEDs
enable simultaneous check and setting of the voltage and current.
The LEDs give indications in green in the constant-voltage mode
and in red in the constant-current mode.
- Increased Output in Series/Parallel Operation
Series connection increases the output voltage (except thePA350-0.2B, and PA600-0.1B). Parallel connection increases theoutput current. One-control parallel connection allows control ofseveral slave power supply units from a single master power supply unit.
- With Floating Output/Voltage Remote Sensing Terminal
The output terminal is a floating type terminal and may be used in
the positive or negative polarity. A voltage remote sensing
terminal is provided on the front panel for fine control of the load
terminal voltage (except the PA80-1B, PA120-0.6B, PA160-0.4B,
PA250-0.25B, PA250-0.42B, PA350-0.2B and PA600-0.1B).
- Various Remote Control Terminals for Systematization
1

The PA-B series have various remote control terminals, whichallow the output to be turned on or off or fixed using external
contact signals and the output voltage or current to be
remote-controlled according to external voltage (0 to 10 V) or input
resistance (0 Ω to 10 kΩ).

2

2. SPECIFICATIONS
Item

PA10-5B

PA18-1.2B

PA18-2B

PA18-3B

PA18-5B

PA36-1.2B

PA36-2B

PA36-3B

OUTPUT
Output voltage
Resolution (logical value)

0 to 10V

0 to 18V

0 to 36V

1.8mV

3.3mV

6.5mV

Voltage setting dial

10 Rotary

Output current
Resolution (logical value)

0 to 5A

0 to 1.2A

0 to 2A

0 to 3A

0 to 5A

0 to 1.2A

0 to 2A

0 to 3A

0.9mA

0.3mA

0.4mA

0.6mA

0.9mA

0.3mA

0.4mA

0.6mA

Current setting dial

10 Rotary

CONSTANT VOLTAGE CHARACTERISTICS （CV）
Input regulation

For ±10% variance ofsource voltage *1

1mV

Load regulation

For 0V to 100% variance of
output current *1

5mV

Ripple and noiserms（10Hz to 1MHz） *2

0.5mVTransient response

typ（current 10% to 100%） *3

50us typTemperature
coefficienttyp

Rise time
Fall time
Remote control
Remote control

Full load/No load
typFull load/No load
typExternal voltage/
output voltage ratio
External resistance/
output voltage ratio

1mV
2mV

2.5mV

2mV
3mV

5mV

2mV

3mV

100ppm/°C typ
100ms/100ms
50ms/1s
Approx.
10V/10V
Approx.
10kΩ/10V

2

Approx. 10V/18V

Approx. 10V/36V

Approx. 10kΩ/18V

Approx. 10kΩ/36V

4mV

Item

PA80-1B

PA120-0.6B

PA160-0.4B

0 to 80V

0 to 120V

0 to 160V

14.4mV

21.6mV28.8mV

PA250-0.25B

PA250-0.42B

PA350-0.2B

PA600-0.1B

0 to 250V

0 to 350V

0 to 600V

45.0mV63.0mV

108.0mVOUTPUT
Output voltage
Resolution (logical value)
Voltage setting dial

10 Rotary

Output current
Resolution (logical value)

0 to 1A

0 to 600mA

0 to 400mA

0 to 250mA

0 to 420mA

0 to 200mA

0 to 100mA

180uA

108uA

72uA

45uA

76uA

36uA

18uA

Current setting dial

10 Rotary

CONSTANT VOLTAGE CHARACTERISTICS （CV）
Input regulation

For ±10% variance of source
voltage *1

5mV

7mV

8mV

15mV

20mV

30mV

Load regulation

For 0V to 100% variance of
output current *1

5mV

7mV

8mV

15mV

20mV

30mV

Ripple and noiserms（10Hz to 1MHz） *2

1mV

1.2mV

1.6mV

2.5mV

3.5mV

5mV

Transient response

typ（current 10% to 100%） *3

Temperature
coefficienttyp200ms/
200ms

330ms/
330ms

Rise time
Fall time
Remote control
Remote control

Full load/No load
typFull load/No load
typExternal voltage/
output voltage ratio
External resistance/
output voltage ratio

50us typ100ppm/°C typ
100ms/
100ms

150ms/150ms

190ms/190ms
50ms/1s

Approx.
10V/80V
Approx.
10kΩ/80V

Approx.
10V/120V
Approx.
10kΩ/120V

3

Approx.
10V/160V
Approx.
10kΩ/160V

50ms/1.5s
Approx. 10V/250V
Approx. 10kΩ/250V

Approx.
10V/350V
Approx.
10kΩ/350V

Approx.
10V/600V
Approx.
10kΩ/600V

Item

PA10-5B

PA18-1.2B

PA18-2B

PA18-3B

PA18-5B

PA36-1.2B

PA36-2B

PA36-3B

CONSTANT-CURRENT CHARACTERISTICS (CC)
Input regulation

For ±10% source voltage
fluctuation *1

Load regulation

For 0V to 100% variance of
outputvoltage *1

5mA

5mA

5mA

5mA

5mA

Ripple and noise

rms

*2

5mA

1mA

5mA

1mA

2mA

(10 Hz to 1 MHz)

2mA

Temperature
coefficienttypRemote control

External voltage to output
current ratio

Approx.
10 V/5 A

Approx.
10 V/1.2A

Approx.
10 V/2 A

Approx.
10 V/3 A

Approx.
10 V/5 A

Approx.
10 V/1.2A

Approx.
10 V/2 A

Approx.
10 V/3 A

Remote control

External resistance to output
current ratio

Approx.
10 kΩ/5 A

Approx.
10k Ω/1.2A

Approx.
10 kΩ/2 A

Approx.
10 kΩ/3 A

Approx.
10 kΩ/5 A

Approx.
10k Ω/1.2A

Approx.
10 kΩ/2 A

Approx.
10 kΩ/3 A

Constant-voltage
operation display

Off when output is off

CV (green LED) is on.

Constant-current
operation display

Off when output is off

CC (red LED) is on.

250ppm/°C typ

DIDITAL METER DISPLAY
Voltmeter display

3 1/2-digit LEDs, red

Accuracy

Output on

Ammeter display

3-digit LEDs, red

Accuracy

Output on *4

19.99 V max., fixed range

19.99V/199.9V max., auto range±(0.2% rdg + 1 digit), 23 ±5°C, 80%RH or less9.99 A max., fixed range±(1.0% rdg + 2 digits), 23 ±5°C, 80%RH or less

Sampling rate

Approx. 2.5 times/sec. or more

4

Item

PA80-1B

PA120-0.6B

PA160-0.4B

PA250-0.25B

PA250-0.42B

PA350-0.2B

PA600-0.1B

CONSTANT CURRENT CHARACTERISTICS （CC）
Input regulation

For ±10% source voltage
fluctuation *1

2mA

1mA

0.5mA

1mA

Load regulation

For 0V to 100% variance of
outputvoltage *1

5mA

5mA

5mA

5mA

Ripple and noiserms（10Hz to 1MHz） *2

2mA

Temperature
coefficienttyp

250ppm/°C typ

Remote control

External voltage to output
current ratio

Approx.10V/1A

Approx.
10V/0.6A

Approx.
10V/0.4A

Approx.
10V/0.25A

Approx.
10V/0.42A

Approx.
10V/0.2A

Approx.
10V/0.1A

Remote control

External resistance to output
current ratio

Approx.
10kΩ/1A

Approx.
10kΩ/0.6A

Approx.
10kΩ/0.4A

Approx.
10kΩ/0.25A

Approx.
10kΩ/0.42A

Approx.
10kΩ/0.2A

Approx.
10kΩ/0.1A

0.5mA
5mA

1mA
250ppm/°C
typ200ppm/°C typ

Constant-voltage
operation display

Off when output is off

CV (green LED) is on.

Constant-current
operation display

Off when output is off

CC (red LED) is on.

200ppm/°C typ

DIDITAL METER DISPLAY
199.9/999 V
max.,auto range±(0.2% rdg + 1
digit), 23 ±5°C,
80%RH or less

2.5mA

Voltmeter display

3 1/2-digit LEDs, red

199.9 V max., fixed range

199.9/999 V max., auto range

Accuracy

Output on

Ammeter display

3-digit LEDs, red

9.99A max.,
fixed range

999mA max., fixed range

Accuracy

Output on *4±(1.0% rdg + 2
digit), 23 ±5°C,
80%RH or less±(1.0% rdg + 3 digit), 23 ±5°C, 80%RH or less±(0.2% rdg + 2 digit), 23 ±5°C, 80%RH or less

Sampling rate

Approx. 2.5 times/sec. or more

5

Item

PA10-5B

PA18-1.2B

PA18-2B

PA18-3B

PA18-5B

PA36-1.2B

PA36-2B

PA36-3B

FUNCTIONSOVPALARM LED goes on

Approx. 5 to 105%OHP

ALARM LED goes on

Output goes off when internal heat sink temperature reaches 105 ±5°C.
(Only PA18-5B,PA36-3B are 110°C)

Output switch

Remote on/off control

Output may be turned on or off with remote control switch on rear panel.
(Front/rear control is selected with switch on front panel.)

V/I check switch

Indicator indicates constant-voltage or constant-current set value when switch is turned on.

Remote sensing

Enabled with (+S) and (-S) terminals on front panel.

May correct up to 0.5 V, one way.

Voltage monitor

Output voltage to monitor
voltage ratio

Output voltage 0 to rated voltage/approx. 0 to 10 V output(Connector on rear panel)

Current monitor

Output current to monitor
voltage ratio

Output current 0 to rated current/approx. 0 to 10 V output(Connector on rear panel)

Status signal

CV

Open collector output, Low in CV mode

CC

Open collector output, Low in CC mode

ALARM

Open collector output, Low in alarm mode

Parallel operation

Master/slave system

Capable of one-control parallel operation.
(Current error: ±20%, up to 3 units. One-control is applicable to same models only.)

6

*5

Item

PA80-1B

PA120-0.6B

PA160-0.4B

PA250-0.25B

PA250-0.42B PA350-0.2B PA600-0.1B

FUNCTIONSOVPALARM LED goes on

Approx. 5 to 105%OHP

ALARM LED goes on

Output goes off when internal heat sink temperature reaches 105 ±5°C.
(Only PA250-0.42B is 110°C)

Output switch

Remote on/off control

Output may be turned on or off with remote control switch on rear panel.
(Front/rear control is selected with switch on front panel.)

V/I check switch

Indicator indicates constant-voltage or constant-current set value when switch is turned on.

Voltage monitor

Output voltage to monitor
voltage ratio

Output voltage 0 to rated voltage/approx. 0 to 10 V output(Connector on rear panel)

Current monitor

Output current to monitor
voltage ratio

Output current 0 to rated current/approx. 0 to 10 V output(Connector on rear panel)

Status signal

CV

Open collector output, Low in CV mode

CC

Open collector output, Low in CC mode

ALARM
Parallel operation

Master/slave system

Open collector output, Low in ALARM mode
Capable of one-control parallel operation.
(Current error: ±20%, up to 3 units. One-control is applicable to same models only.)

7

Item

PA10-5B

PA18-1.2B

PA18-2B

PA18-3B

PA18-5B

PA36-1.2B

PA36-2B

PA36-3B

OPERATING CONDITIONS
Operating temperature/humidity range

0 to 40°C 10% to 80%RH

Storage temperature/humidity range-20 to 60°C 10% to 85%RH

Cooling method

Natural convection

Output polarity

Positive or negative grounding possible

Ground proof voltage
Insulation
resistance
Insulated
resisting pressure±250VDC

Between the chassis andinput power supply terminal
Between the chassis and
Output terminal
Between the chassis andinput power supply terminal

DC500V 30MΩor more
DC500V 20MΩor more
AC1.5kV /1 minute

POWER REQUIREMENTS
Input Voltage, frequency

AC220V±10%、50/60Hz、1φPower consumption（VA）

At the time of AC rated input

Approx.
150VA

Approx.
60VA

Approx.
100VA

Approx.
140VA

Approx.
210VA

Approx.
105VA

Approx.
165VA

Approx.
220VA

Power consumption（W）

At the time of AC rated input

Approx.
120W

Approx.
50W

Approx.
75W

Approx.
110W

Approx.
165W

Approx.
80W

Approx.
130W

Approx.
170W

DIMENSIONS AND WEIGHT
Dimensions(mm)Max. dimensions(mm)Weight104×124×350
106.2×144.3
×368.3
Approx.
6.6kg

104×124×270

104×124×350

106.2×144.3×288.3

106.2×144.3×368.3

Approx.
4.7kg

Approx.
6.6kg

Approx.
4.7kg

ACCESSORIESOne adjustment driver,

8

Approx.
6.6kg

104×124104×124×350
×270
106.2×144.3
106.2×144.3×368.3
×288.3
Approx.
Approx.
Approx.
4.7kg
6.6kg
6.6kg

One power cable（3P）

Item

PA80-1B

PA120-0.6B

PA160-0.4B

PA250-0.25B

PA250-0.42B

PA350-0.2B

PA600-0.1B

OPERATING CONDITIONS
Operating temperature/humidity range

0 to 40°C 10% to 80%RH

Storage temperature/humidity range-20 to 60°C 10% to 85%RH

Cooling method

Natural convection

Output polarity

Positive or negative grounding possible

Ground proof voltage
Between the chassis andinput power supply terminal
Insulation
resistance
Between the chassis and
Output terminal±250VDC±500VDC±600VDC

DC500V 30MΩor more
DC600V
20MΩ
or moreDC500V 20MΩor more

Insulated
Between the chassis andresisting pressure input power supply terminal
POWER REQUIREMENTS

AC1.5kV /1 minute

Input Voltage, frequency

AC220V±10%、50/60Hz、1φPower consumption（VA）

At the time of AC rated input

Power consumption（W）

At the time of AC rated input

Approx.
170VA
Approx.
140W

Approx.
155VA
Approx.
115W

Approx.
150VA
Approx.
100W

Approx.
140VA
Approx.
105W

Approx.
220VA
Approx.
150W

Approx.
150VA
Approx.
110W

Approx.
130VA
Approx.
100W

Approx.
6.6kg

Approx.
6.6kg

DIMENTIONS AND WEIGHT
Dimensions(mm)104×124×350

Max. dimensions(mm)Weight106.2×144.3×368.3
Approx.
6.6kg

Approx.
6.6kg

ACCESSORIESApprox.
6.6kg

Approx.
6.6kg

One adjustment driver,*1: By LCL (internal sensing) at the sensing terminal.
*2: Measurement is done by ground either positive or negative output.
*3: Responding time when output voltage returns to within 0.05%+10mV of the rating at ON.
*4: After worm up for approximately 30 minutes when the current is fed.
*5: When the power supply output is rated value or less.

9

Approx.
6.6kg

One power cable（3P）3. INSTRUCTIONS ON USE
Be sure to read through the instructions shown below prior tousing the PA-B series.

WARNING
3-1. Checking Source Voltage* Be sure to connect the PA-B series with a commercial power
supply of the rated voltage.
* The rated voltage is shown on the rating nameplate near the AC
inlet on the rear panel.

3-2. Connection of Power Cable* Connect the power cable plug firmly into the AC outlet thatcarries the rated voltage.

CAUTION3-3. Precautions for Connecting Output Terminals* The PA-B series is a floating type power supply unit. Normally,
connect either the (+) or (-) output terminal on the front panel
with the GND terminal (case GND) using a shorting bar.
* The (+S) and (-S) terminals and switch on the front panel areused for remote sensing (PA10-5B, PA18-1.2B, PA18-2B,
PA18-3B, PA18-5B, PA36-1.2B, PA36-2B and PA36-3B only).
Normally, set the switch to the LCL position and connect
nothing with the terminals. If the switch is set to the REM
position, the voltage sensing circuit is disconnected internally,
resulting in erroneous output voltage indication.
For remote sensing connection, see section 5-2 "Remote
Sensing" below.

103-4．Switches on Front Panel and Connection Terminals on
Rear Panel* Make sure that the MASTER/SLAVE selector switch on thefront panel is set to the M position.
* Make sure that the OUTPUT SW F/R selector switch on thefront panel is set to the F position.
* Make sure that all remote selector switches on the front panel
are set to the Off positions.
* Connect nothing with the connection terminals on the rear
panel unless the master/slave mode, remote control mode or
the like is selected.

3-5．Digital Display*Digital display of the PA-B series is subject to 1-digit fluctuations,which depend on the performance of the A/D converter.
Such fluctuations do not imply ripples or noises in output.
* Display may become unstable if the available commercial
power source contains much common mode noises or there isan intense noise source near the PA-B series. Be very
careful.

3-6. Switching Points of Relay* The PA-B series switches the secondary taps of the internaltransformer using a relay and changes the input voltage to theseries regulator in order to reduce internal losses. It has
three relay switching points, which vary with the input voltage.
* If the input voltage varies when the preset output voltage isclose to the relay switching point, the relay switches and arelay switching sound may be heard. (This implies notrouble.) Noises may be generated at the relay switching
point when the output increases, depending on input voltage(low voltage) or load conditions.

113-7. Installation Environments* Use the PA-B series in the ambient temperature range from 0 to
+40°C.
* The PA-B series is a natural air cooling type power supply unit.
Do not put any object on it, place it on a heat-generating
object, or stack several PA-B units. Use the PA-B series in aplace having as good ventilation as possible.
* The heat sink built in the PA-B series may become hot during
operation. Be very careful about ventilation. Do not place
any object easily affected by heat near the PA-B series.
* As the built-in heat sink overheats, the case of the PA-B series
may become hot. If it is necessary to touch the case or
move the PA-B series, turn off power and wait for a mean
while (until the case cools down).

HOT BE CAREFUL12

3-8. Rack Mounting

HOT BE CAREFUL* Contact the our distributor if you need the rack mounting kit.
* The PA-B series is a natural air cooling type power supply unit.
Proper heat radiation measures are needed when mounting it
on a rack. Leave sufficient spaces above and below the unit
mounted on a rack and take the proper heat radiation
measures in order to prevent the temperature in the rack(ambient temperature) from exceeding the allowabletemperature range. The OHP may work if the temperature
exceeds the allowable temperature range.

3-9. Options
The guard cap and handle for the PA-B series are available byoption. (The handle is mounted in the factory.) Contact our
distributor for details.
* Guard cap (OP-20GC)
The guard cap is to be replaced with the knob to prevent thepreset voltage or current from being changed by mistake.

13

4. PANEL EXPLANATION
4

6 5

3

2
7
8
16

18
19

17

10

9

12

14 13

11

15

1

25

20

A

21
22
23
26

27

24

14

4-1. Front panel
1. POWER ON／OFF
The power switch of the PA-B series.
Set the switch to ON to turn on power. When power is turned
on, the PA-B series runs.
2. OUTPUT key and OUTPUT LED (red)The output On/Off switch of the PA-B series.
Press the OUTPUT key to turn on the output (and the OUTPUT
LED goes on). The voltmeter and ammeter indicate the output
values at that time.
When the OUTPUT key is pressed while the OUTPUT LED is lit,
the OUTPUT LED goes out and the output is shut off.
NOTE 1: When the PA-B series is turned on, the OUTPUT LED
and output are always off.
NOTE 2: When the OUTPUT F/R selector switch on the front
panel is set to the R position, the OUTPUT key is
disconnected and the output is set to the Off condition.
If the PA-B series is turned on in this condition, theoutput is turned off.
3. Digital voltmeter (3 1/2-digit LEDs, red)This voltmeter displays the output voltage or the set voltage(only when the V/I check key on the front panel is pressed).
4. Digital ammeter (3-digit LEDs, red)This voltmeter displays the output current or the set current(only when the V/I check key on the front panel is pressed).
5. CV LED (green)
The constant-voltage mode indicator LED.
It is lit when the PA-B series is in the constant-voltage mode.
6. CC LED（red）
The constant-current mode indicator LED.
It is lit when the PA-B series is in the constant-current mode.

15

7. ALARM LED（red）
The alarm status indicator LED.
It is lit when the over-voltage or overheat protection circuit works
and turns off the output. Press the POWER ON/OFF switch toturn off power once, eliminate the alarm cause, and turn on
power again.
8. V/I CHECK key
This key is used to display the set voltage and set current.
The voltmeter displays the set voltage and the ammeter displays
the set current while the key is held.
NOTE: When this key is pressed, the minimum digit of thevoltmeter becomes 100 mV (or 10 mV on a model of
18 V rating).
9. VOLTAGE control
This control is used to set the voltage in constant-voltage
operation. It varies and sets the limit value of the output voltage.
10. CURRENT control
This control is used to set the current in constant-current
operation. It varies and sets the limit value of the output current.
11. Output terminal (+)
Positive (+) output is given through this terminal.
12. Output terminal (-)
Negative (-) output is given through this terminal.
13. GND terminal
This grounding terminal is connected with the frame. Connecta shorting bar between the GND terminal and (+) or (-) output
terminal normally.
14. Shorting bar
The shorting bar is normally used to connect the GND terminaland (+) or (-) output terminal.

16

15. Remote sensing (PA10-5B, PA18-1.2B, PA18-2B, PA18-3B,
PA18-5B, PA36-1.2B, PA36-2B and PA36-3B)
・ REM/LCL selector switch
This switch is normally set to the LCL (internal sensing) position.
Set it to the REM position to execute remote sensing.
NOTE: Do not set this switch to the REM position unless the
remote sensing function is used. Connect the sensing
cable and load cable firmly to prevent them from being
disconnected during sensing.
・ +S terminal
The (+) output remote sensing terminal.
・ -S terminal
The (-) output remote sensing terminal.
16. OVP control
This control is used to set the operating voltage of the OVP(over-voltage protection) circuit.
17. MASTER/SLAVE selector switch
This selector switch is used to carry out one-control parallel
operation in the master/slave mode. Set it to the MASTER
position normally. (For details, see section 5-11 "One-Control
Parallel Operation" below.)
18. Rear panel control selector switch
This switch selects the constant-voltage, constant-current andoutput on/off remote controls. Set it to the OFF position
normally. Operations on the front panel are enabled at thisposition. Remote controls are enabled at other positions.
(For details, see section 5 "OPERATION PROCEDURES" below.)
19. Rear panel control volume
This volume is used for remote constant-voltage and constantcurrent controls.
(For details, see section 5 "OPERATION PROCEDURES" below.)17

4-2. Rear panel
20. MASTER/SLAVE connection terminals
These terminals are used for one-control parallel operation in themaster/slave mode. (For details, see section 5-11 "One-Control
Parallel Operation" below.)
21. Rear panel remote control terminals
These terminals are used for constant-voltage, constant-current
and output on/off remote controls. (For details, see section 5"OPERATION PROCEDURES" below.)
22. Status signal output terminals
These terminals output the CV, CC and ALARM status signals.
(For details, see section 5-8 "Status Signals" below.)
23. Voltage and current monitor signal output terminals
These terminals output the monitored voltage and current of the
PA-B series in voltages. (For details, see section 5-9 "Monitoring
Voltage and Current" below.)
24. AC inlet
The AC inlet connector of the PA-B series.
25. Input AC voltage selector switches
The 2 combination switches are located in the rear panel ofthe unit to select the input AC voltage. Set them as shown
below to select AC 100V, 110V, 200V or 220V. However, it
becomes a switch of AC100V, 115V, 200V, and 230V
according to the model. Which voltage can be set isdisplayed in rear panel of the PA-B SERIES. (Please refer tothe table for the A. Voltage setting table)
Use 115V for actual 120V AC operation.

18

100V

110V/115V

200V

220V/230V

LINE VOLTAGE SELECT

LINE VOLTAGE SELECT

LINE VOLTAGE SELECT

LINE VOLTAGE SELECTSWITCH～LINE
VOLTAGE POSITIONFUSE 250V

A. Voltage setting table
SWITCH～LINE
VOLTAGE POSITIONFUSE 250V

100V

000A

100V

000A

110V

000A

115V

000A

200V

000A

200V

000A

220V

000A

230V

000A

WARNINGNOTE: Be sure to disconnect the AC power cable before setting the
input AC voltage.
Be sure to use the proper fuse as shown below.
Fuse(time-lag)100/200 VAC

Fuse(time-lag)100/200 VAC

10-5

18-1.2

18-2

18-3

18-5

36-1.2

36-2

36-3

3A/
2A

1.6A/
0.8A

2A/
1.25A

3A/
2A

5A/
3A

2.5A/
1.6A

3A/
2A

5A/
3A

80-1

120-0.6

160-0.4

250-0.25

250-0.42

350-0.2600-0.1

3A/2A

3A/2A

3A/2A

3A/2A

4A/2.5A

3A/2A

3A/
2A

26. Fuse holder

The AC input fuse is built in this holder.
27. Frame GND terminal screw
Use this screw to ground the frame of the PA-B series. Neveruse any other screw. Using any other screw may cause
short-circuit inside the PA-B series, resulting in malfunctioning or
breakdown.

19

5. OPERATION PROCEDURES
5-1．Independent Operation*Use the switches and terminals on the front panel to use the PA-B
series alone.
*Make sure that the switches on the front panel are set as shown
below.
OUTPUT switch
MASTER/SLAVE switch
Various control ON/OFF switches：F (front) position：M (master) position：OFF positions

5-2．Remote Sensing*When the PA-B series is connected with a load, the voltage at theload terminals is subject to load variance, which depends on thevoltage drop caused by contact resistance of the output terminals or
resistance of the load cable conductors.
Set the remote sensing selector switch on the front panel to the
REM position, connect wires to the (+S) and (-S) remote sensing
terminals and carry out remote sensing operation, if it is necessary
to set the voltage at the load terminals finely.
*The PA-B series compensates for voltage drop of the load cable up
to 0.5 V (one way).
*Do not set the selector switch to the REM position in normal
operation without using the remote sensing function.

20

CAUTION- This function is available in the PA10-5B, PA18-1.2B, PA18-2B,
PA18-3B, PA18-5B, PA36-1.2B, PA36-2B and PA36-3B only.
- If no remote sensing cable is connected despite the fact that the
remote sensing selector switch is set to the REM position, theoutput voltage may be too high and the load may be broken. Be
sure to set the selector switch to the LCL position when remotesensing is not carried out.
- If the load is too apart from the PA-B series, inductance andcapacitor of the load cable may cause oscillation. Connect anelectrolytic capacitor of approximately 100 µF to the load
terminals in such a case.
＋
＋S
Load

Vo
－S

Vo ≦ Rated voltage－

Use a shielded cable or twisted pair wires.

5-3．OVP*The OVP protects the load from over-load. The ALARM LED
goes on when the OVP circuit works. Shut off the POWER
switch once and turn it on again to reset the alarm.
1) Turn the OVP control fully clockwise with the adjustment
screwdriver supplied with the PA-B series.
2) Output the limit voltage for over-voltage protection. Turn the
OVP control counterclockwise slowly with the adjustment
screwdriver until the OVP circuit works.
3) Cut off output when the voltage between the output terminals of
the PA-B series reaches the preset OVP value.
21

5-4．Remote Control Functions
1. Remote control application functions
The switches on the front panel are set as shown below by default.

V ext.V

V ext.R

I ext.V

I ext.ROUTPUT MASTER/SLAVE
SW
R
F

ON
OFF

Output voltage control
by external voltage

Output current control
by external voltage

Output voltage control
by external resistanceS
M

OUTPUT SW
control

Output current control
by external resistanceOne-control operationin parallel connection

2. Remote control applications
Remote functions

MASTER/SLAVECV
REMOTE
voltage orresistanceCC
REMOTE
voltage orresistance

OUTPUT
ON/OFF

Set to M
Set to M
Set to S

○
○
×

○
○
×

○
○
○

Operation types
Independent operation
One-control
MASTER
parallel operation
SLAVE○ : Remote control is available.
× : Remote control is not available.

223. Usage of connection terminals on rear panel
Follow the procedures shown below to connect the cables to theterminals on the right of the rear panel.
1) Apply a flathead screwdriver (thin screwdriver) to the slit on theright of the round (or square) hole for connecting a cable.
Press it and insert the cable conductor into the round (orsquare) hole.
2) Disconnect the cable in the same manner. Press the slit withthe screwdriver and pull out the cable.

1) Press with the screwdriver.

2) Insert the cable

NOTE: Applicable wires：Solid wire: 0.4 to 1.0 mm dia. (AWG26 to 18)
Braided wire: 0.3 to 0.75 mm²(AWG22 to 20)
Element wire: 0.18 mm dia. or moreStandard peel-off length: 10 mm (Solder the peeled conductorsof a braided wire.)
4. GP-IB control*It is possible to set the constant-voltage and constant-current
values and control the OUTPUT switch of the PA-B series froma computer through the GP-IB bus (in conformity toIEEE-488-1978) if the optional GP-IB adapter GP-600B is used.
*A single GP-600B may control the following of each PA-B unit.
- Output voltage and current setting- OUTPUT ON/OFF- ALARM detection- CV  CC, CC  CV mode interrupt

23

5-5．Output ON/OFF Remote Control*It is possible to control output On/Off using external contact
signals as shown below
1) Shut off the POWER switch.
2) Set the OUTPUT SW on the front panel to the R position withthe attached adjustment screwdriver, and connect the cable tothe terminals on the rear panel as shown below.
Terminals on rear panel

Front panel switch
OUTPUTSW
RF

OUTPUT1ON

OUTPUT2OFFOr

OUTPUT terminals
Short
Open

OutputONOFF

The OUTPUT key on the front panel is not active.
NOTES:- Float the potential of the external contact signal from the potentialsof the (+) and (-) outputs and GND (case GND). ON/OFF control
using a photo-coupler is also enabled.
- 0.5 mA, 5 V max. output is applied to the external contacts.
※Selecting output ON and output fixing- If the OUTPUT SW is set to the R position and the OUTPUT
terminals on the rear panel are short-circuited, the output is turned oncontinuously.
In this condition, the output is turned on when the PA-B series isturned on.

24

5-6．Constant-Voltage Remote Control
1. Output voltage control using external voltage*It is possible to control the output voltage using 0 to 10 V external
voltage.
1) Shut off the POWER switch.
2) Set the offset and FS switches of "V ext. V" on the front
panel to the ON positions with the attached screwdriver.
Connect a cable to the terminals on the rear panel as shown
below.
Front panel switches and controls

Terminals on rear panel

V ext.V
ext.cont.V+
V.V－(－S)ON
OFF
V offset

E1

V FS
Use a shielded cable or twisted pair wires.

Relationship between output voltage (E0) and external voltage (E1)

E0≒

Emax
10

× E1 [V] （0≦E1≦10V）

E0: Output voltage
Emax: Rated voltage
E1: External voltage

3) Adjustment procedures- Apply 0.1 V between the "ext. cont. V" V+ terminal and"ext. cont. V" - (-S) terminal on the rear panel.
- Press the OUTPUT key to turn on power.
- Rotate the V offset control on the front panel with theattached adjustment screwdriver to adjust the output voltage
to 1% of the rated voltage.
- Then, apply 10 V between the "ext. cont. V" V+ terminal and"ext. cont. V" - (-S) terminal on the rear panel.
- Rotate the V FS control on the front panel with the attachedadjustment screwdriver to adjust the output voltage to 100%of the rated voltage.
25

NOTES:- The negative (-) potential of the external voltage (E1) represents thevoltage at the (-) output terminal. The negative (-) potential of theinternal control voltage also represents the voltage at the (-) output
terminal. Therefore, be very careful when grounding the output.
- Ripples and noises contained in the external voltage are amplified
and output. Thus, use external voltage with less ripples andnoises.
- The input impedance (Zin) of E1 is approximately 10 kΩ.
- Supply E1 using a two-core shielded cable or stranded (+) and (-)
twist pair wires.
2. Output voltage control using external resistance*It is possible to output voltage in proportion to resistance between
0 to 10 kΩ.
1) Shut off the POWER switch.
2) Set the V ext. R switch on the front panel to the ON position
with the attached screwdriver. Then, connect a cable to theterminals on the rear panel as shown below.
Front panel switch and control
V ext.R
ON
OFF

Terminals on rear panel
ext.cont
R1
V
R2

VR1

Use a shielded cable or twisted pair wires.

Relationship between output voltage (E0) and external resistance (VR1)

E0≒

Emax
10

E0 : Output voltage
× VR1 [kΩ] （VR1≦10kΩ） Emax: Rated voltage
VR1 ：External resistance263) Adjustment procedures- Connect an external resistor VR1 between the "V ext. cont." R1
terminal and "V ext. cont." R2 terminal on the rear panel.
- Set the VR1 to 10 kΩ.
- Press the OUTPUT key to turn on power.
- Rotate the V FS control on the front panel with the attachedadjustment screwdriver to adjust the output voltage to the rated
voltage.
Front panel
V FS

NOTE:
- The potential at the terminals of the external resistor (VR1) should
be floated from the (+) and (-) output and GND potentials.
- As VR1, use a variable resistor which is free from aged
deterioration and noises and has a temperature coefficient ofapproximately 100 ppm/°C and capacity of 1/2 W or more.
- Connect VR1 with a two-core shielded cable or stranded (+) and (-)
twist pair wires.

CAUTION- If VR1 is opened, over-voltage is output.
- When changing the resistance using a switch or the like, it should
be a short circuit type switch that does not make the circuit open.
- Do not set the V ext. R switch to the ON position in the condition
where the output is on.
Otherwise, voltage exceeding the
maximum rating is applied to the output, resulting in breakage ofthe load.

27

5-7．Constant-Current Remote Control
1. Output current control using external voltage*It is possible to control the output current using 0 to 10 V external
voltage.
1) Shut off the POWER switch.
2) Set the offset and FS switches of "I ext. V" on the front panel
to the ON positions with the attached screwdriver. Connect acable to the terminals on the rear panel as shown below.
Front

panel

switches

Terminals on rear panel

andcontrols
I ext.V
ext.cont

ONOFF
I offset.V+

I .V－(－S)

E2

I FS
Use a shielded cable or twisted pair wires.

Relationship between output current（I0） and external voltage （E2）
。

Ⅰ0≒

Imax
10

× E2 [V] （0≦E2≦10V）

I0 ：Output current
Imax：Rated current
E2 ：External voltage

3) Adjustment procedures- Apply 0.1 V between the "ext. cont. I" V+ terminal and "ext.
cont. I" V- (-S) terminal on the rear panel.
- Press the OUTPUT key to turn on power.
- Rotate the I offset control on the front panel with the attachedadjustment screwdriver to adjust the output current to 1% of
the rated current.
- Then, apply 10 V between the "ext. cont. I" V+ terminal and"ext. cont. I" V- (-S) terminal on the rear panel.
- Rotate the I FS control on the front panel with the attachedadjustment screwdriver to adjust the output current to 100% of
the rated current.
28

NOTES:- The negative (-) potential of the external voltage （E2）represents
the voltage at the (-) output terminal. Therefore, be very carefulwhen grounding the output.
- Ripples and noises contained in the external voltage are amplified
and output. Thus, use external voltage with less ripples and noises.
- The input impedance （Zin） of E2 is approximately 10 kΩ.
- Supply E2 using a two-core shielded cable or stranded (+) and (-)
twist pair wires.
2. Output current control using external resistance*It is possible to output current in proportion to resistance between
0 to 10 kΩ.
1) Shut off the POWER switch.
2) Set the I ext. R switch on the front panel to the ON position
with the attached screwdriver. Then, connect a cable to theterminals on the rear panel as shown below.
Front panel switch and control
I ext.R
ON
OFF

Terminals on rear panel
ext.cont
R1
I
R2

Use a shielded cable or twisted pair wires.

Relationship between output current （I0）and external resistance （VR2）

I0≒

Imax
10

I0 ：Output current
× VR2 [kΩ] （VR2≦10kΩ） Imax：Rated current
VR2 ：External resistance

29

VR2

3) Adjustment procedures- Connect an external resistor VR2 between the "I ext. cont." R1
terminal and "I ext. cont." R2 terminal on the rear panel.
- Set the VR2 to 10 kΩ.
- Press the OUTPUT key to turn on power.
- Rotate the I FS control on the front panel with the attachedadjustment screwdriver to adjust the output current to the rated
current.
Front panel
I FS

NOTES:- The potential at the terminals of the external resistor (VR2) should
be floated from the (+) and (-) output and GND potentials.
- As VR2, use a variable resistor which is free from aged deteriorationand noises and has a temperature coefficient of approximately
100 ppm/°C and capacity of 1/2 W or more.
- Connect VR2 with a two-core shielded cable or stranded (+) and(-) twist pair wires.

CAUTION- If VR2 is opened, over-current is output and the PA-B series may
be damaged.
- When changing the resistance using a switch or the like, it should
be a short circuit type switch that does not make the circuit open.
- Do not set the I ext. R switch to the ON position in the condition
where the output is on. Otherwise, current exceeding the
maximum rating is output, resulting in breakage of the load.

30

5-8．Status Signals
1. CV operation status output signal
This signal is active while the PA-B series is running in the CV(constant-voltage) mode.
2. CC operation status output signal
This signal is active while the PA-B series is running in the CC(constant-current) mode.
3. ALARM status output signal
This signal goes active when the PA-B series enters an alarm
status. It enters the alarm status and turns off output if the
OVP or OHP circuit works.

Connection terminals on rear panel

CV
CC
ALARM
COMMONNOTE: The status signal output terminals shown above areconnected with the transistors at the light receiving elementsof the photo-couplers (TOSHIBA TLP521-1) inside the PA-B
series. See the photo-coupler ratings shown below and use
these signals properly.
※ Maximum rating of photo-coupler TLP521-1
Item
Collector-emitter voltage
Emitter-collector voltage
OutputCollector current
Collector loss
Total allowable loss
Dielectric strength voltage
31

SymbolMax. rating

Unit

VCEO
VECO
IC
PC
PT
BVS

55
7
50
150
250
2500

V
V
mA
mW
mW
Vrms

5-9. Monitoring Voltage and Current*It is possible to monitor the output voltage and current of the PA-B
series in terms of voltages.
Connection terminals on rear panel＋
I MONITOR+
I MONITOR－(－S)

M

Current monitoring－＋
V MONITOR+
V MONITOR－(－S)

M

Voltage monitoring－－S

1) Shut off the POWER switch.
2) Connect a voltage monitoring meter between the V MONITOR+ terminal and V MONITOR -(-S) terminal on the rear panel.
Connect a current monitor meter between the I MONITOR +terminal and I MONITOR - (-S) terminal.
3) Throw the POWER switch to turn on power.
4) When the output voltage is in the range between 0 V and therated voltage, voltage between 0 and approximately 10 V isoutput through the V MONITOR + terminal and V MONITOR-(-S) terminal.
5) When the output current is in the range between 0 A and therated current, voltage between 0 and approximately 10 V isoutput through the I MONITOR + terminal and I MONITOR-(-S) terminal.
NOTE: The V MONITOR - (-S) and I MONITOR - (-S) terminals areconnected together internally. The -S terminal is connectedwith the frame GND through the shorting bar. Use themonitor meters in the floated condition to avoid accidents ormalfunctioning. These monitor terminals may not be used toobserve waveforms.
32

5-10．Series and Parallel Connections
1. Series connection*It is possible to increase the output voltage by connecting two or
more PA-B power supply units.
- In the connection example shown below, the total output voltage
is the sum of the output voltage of each PA-B power supply unit.
(Left figure)- In the connection example shown below, the positive andnegative powers are output. (Right figure)

－ G＋

－ G ＋

E0=E1+E2
E1+

E0=+E1E0=－E2
+
Load

+E
Load

E0

1

－
－ G ＋

Load
－ G＋

－E2

－
E2

NOTE 1: In series connection, the voltage at the output terminals
must not exceed the withstand grounding voltage (between
the output terminals and frame GND). Be very careful.
NOTE 2: Connect the GND terminals of the PA-B power supply units
together with an intended potential to eliminate the potential
among the frame grounds of the power supply units.
(The above drawing shows the negative (-) grounding.)
NOTE 3: Do not connect the PA350-0.2B and PA600-0.1B in series.
NOTE 4: Be sure to float the control input of each power supply unit
when using the external control function.
33

2. Parallel connection*It is possible to increase the output current by connecting two or
more PA-B power supply units in parallel.
E0

①

E1

②

E2
－ G ＋

E1

E0

③

－ G ＋

I1

I2

E2

I0

E0=E1=E2
I0=I1+I2

I0
I1

I2

*Constant-voltage (CV) application
Make the output voltage of each power supply unit equal.
Difference in the output voltages (like E1 > E2) will result influctuations for the load.
①Current is supplied from E1 first.
②When the current enters the constant-current (CC) zone andthe output voltage lowers,③E2 begins to supply current then.
*Constant-current (CC) application
Make sure that the CC LED on each power supply unit is lit.
The total output current is the sum of the output current of eachpower supply unit.
NOTE 1: Do not apply any voltage exceeding the rated voltage to the
output of each power supply unit.
NOTE 2: Current of several mA flows back to the power supply unit
with lower output voltage.
34

5-11．One-Control Parallel Operation*It is possible to control units connected in parallel (i.e., two slave
units) and increase their output capacity from one unit (master unit).
*The total output current capacity is the sum of the output current ofeach slave unit.
1) Turn off power of all master and slave units.
2) Set the MASTER/SLAVE switches on the front panels of allslave units to the S position.
3) Connect the parallel operation terminals (IN/OUT1/OUT2) on
the rear panels of the master and slave units as shown in thedrawing.
4) Connect the output terminals of the power supply units with theload using cables of the same length as shown in theconnection diagram.
5) Rotate the voltage control of all slave units fully clockwise.
6) Throw the POWER and OUTPUT switches of the slave units.
7) Throw the POWER and OUTPUT switches of the master unit.
The output voltage and current may be set freely with thevoltage and current controls of the master unit.
NOTE 1: -The CV or CC LED of the master unit shows the output mode.
- On the slave units, the CC LEDs are always lit.
NOTE 2:-Connect the GND terminal with the (+) or (-) terminal. This
commonly applies to the master and slave units. (Theoutput connection diagram below shows the (-) grounding
connection.)
NOTE 3: -In parallel operation, it may sometimes be impossible tovary the output voltage on the master unit when the output
reaches 0 A. Use the master unit so that several % ormore of the rated current always flows.
NOTE 4:-Set the controls of the slave units to the maximum positions
in parallel operation.
＊ Control the master unit only in remote control.
Read section 5-4 "Remote Control Functions" above.
35

Setting of Front Panel Switches and Connection ofRear Panel Terminals for Parallel Operation
Master unit

Slave unit

Slave unit

MASTER/SLAVEMASTER/SLAVEMASTER/SLAVE

S

S

S

M

M

M

OUT1

OUT1

OUT1

IN

IN

IN

OUT2

OUT2

OUT2

Output Connection Diagram for Parallel Operation
I1

I2

Master unit

Slave unit (1)Slave unit (2)

I3
＋
I0
Load

－ G ＋

－ G ＋

－ G ＋

－

NOTE: I0=I1+I2+I3
Set the voltage controls of all slave units to the maximum position.
The master unit runs in the CV mode.

36

The slave units run in the CC mode.

5-12．Recharging Battery＋

Battery－ G ＋－

Diode for preventing current discharging*A capacitor of several µ to dozens of µ is connected to the outputof the PA-B series. The PA-B series incorporates a circuit fordischarging electric charges from the capacitor when power isturned off. Be sure to connect a diode for preventing current
discharging as shown above when using the PA-B series forrecharging a battery.
NOTE: Use a diode having enough capacity to withstand the rated
current of the PA-B series.

Closes when output is turned on.

＋－G＋

Battery－*Be sure to connect a relay between the +S and -S wires in series
as shown above when recharging a battery using the voltage
remote sensing function. The relay must close when the output
is turned on and open when the output is turned off. Discharged
current also flows through the +S and -S wires.
37

6. TROUBLES AND PHENOMENA
Phenomenon

Check point

Trouble cause

Power is not turned
on even if the POWER
switch is thrown.
(LED on the front
panel does not goon.)

Poor contact or
breakage of the power cable
Blowout of the fuse

*Poor contact or breakageof he power cable
Blowout of the fuse
*POWER switch is defective.
*Too high AC voltage is
input.

No voltage is output.
No current is output.
Excessive output isyielded.

Voltmeter does not shake.
Ammeter does not shake.
Output voltage or current
does not lower.

Output is unstable.

Difference of the input
Voltage Oscillation Intense
magnetic or electric fieldnear the PA-B unit

*Circuit is defective.
*Circuit is defective.
*Power transistors are
defective or uncontrollable.
*Circuit is defective.
*Input voltage is out of therating range.
*Oscillation due to a
special load.
*Move the PA-B unit fromthe oscillation source.

If the trouble is caused by blowout of the input fuse, replace it with afuse of the specified rating. Disconnect the power cable before
replacing the fuse.
If the trouble seems to be caused by defects of the internal circuit,contact our distributor.

WARNING
Never remove the case. Entrust our distributor with repair services
requiring removal of the case.

38

7. EXTERNAL DIMENSIONS FIGURE[unit :mm]
(8.2)
! WARNINGOUTPUT

OUT1
IN
V ext.V

V ext.R

I ext.V

I ext.R

!
J1

OUT2

ｅｘｔ．ｃｏｎｔ．
V offsetＶ

I offset

Ｉ

Ｖ+
V－（－S）Ｒ１
Ｒ２
Ｖ+
V－（－S）
Ｒ１
Ｒ２
－
－

144.3

124

Ｉ
Ｖ

＋
－（－S）
＋
－（－S）

MONITOR

-

GN D

+

LCL

S
No.

00000000
MADE IN JAPAN

104

12.1

106.2

14.9

270
288.3

Short type(PA18-1.2B、PA18-2B、PA36-1.2B)
VT Option: With handle
39

!
J2

14.9

350
368.3

Long type(PA10-5B、PA18-3B,5B、PA36-2B,3B、PA80-1B～PA600-0.1B)

40

7F Towa Fudosan Shin Yokohama Bldg.
2-18-13, Shin Yokohama, Kohoku-ku,Yokohama, Kanagawa, 222-0033 Japan
https://www.texio.co.jp/