UG1 INSTRUCTION MANUAL

Thank you for your purchase of our Thyristor Type Power Regulator Unit CALPOTE UG1 Series.
In order to use this product safely and correctly, read this instruction manual thoroughly before
using this product.
This manual is revised from time to time, so please obtain the latest version from our website
before use.
K00A0482200AA

Mar. 26, 2024

TABLE OF CONTENTS

1

2
3
4
5

6

7

SAFETY PRECAUTIONS ........................................................................................................ 5
1.1

Usage/Storage Location ........................................................................................................................................ 7

1.2

Installation ......................................................................................................................................................................... 7

1.3

Wiring .................................................................................................................................................................................... 8

1.4

Maintenance/Inspection ......................................................................................................................................... 8

PRECAUTIONS DURING USAGE ..................................................................................... 9CHECKING THE PRODUCT ............................................................................................. 11
UNIT CONNECTION DIAGRAM ...................................................................................... 13
EXTERNAL CONNECTIONS OF THE UNIT .......................................................... 14
5.1

Control Terminal Block ........................................................................................................................................ 14

5.2

Connection Diagrams for Setting Methods .......................................................................................... 17

UNIT CONTROL WIRING METHOD ............................................................................. 29
6.1

Control Wiring Method ......................................................................................................................................... 29

6.2

Grounding ..................................................................................................................................................................... 29

DISPLAY PANEL ....................................................................................................................... 30
7.1

Names and Overview of the LED Lamps and Keys ....................................................................... 30

7.2

Operations..................................................................................................................................................................... 31
Selecting and displaying modes and items ......................................................................... 31
Changing settings ................................................................................................................................. 32

7.3

Modes ............................................................................................................................................................................... 33
MONITOR mode ...................................................................................................................................... 33
PARAMETER mode ............................................................................................................................. 34
FUNCTION mode ................................................................................................................................... 38
7.3.3.1

F0: Rated value ............................................................................................................. 39

7.3.3.2

F1: Control method .................................................................................................... 40

7.3.3.3

F2: Parameter priority ............................................................................................... 41

7.3.3.4

F3: Function characteristics ................................................................................ 43

7.3.3.5

F4: Conversion board............................................................................................... 44

7.3.3.6

F5: Communication board .................................................................................... 47

7.3.3.7

F6: Error output destination selection.......................................................... 48

7.3.3.8

F7: System setting....................................................................................................... 50

OPTION mode .......................................................................................................................................... 51

8

7.3.4.1

oP01: Error history check...................................................................................... 51

7.3.4.2

oP02: Heater resistance setting........................................................................ 51

ERROR DETECTION ............................................................................................................... 52
8.1

Er.01: Overcurrent Detection .......................................................................................................................... 54
2

9

8.2

Er.02: Temperature Rise Error ....................................................................................................................... 54

8.3

Er.03: Fuse Blowout .............................................................................................................................................. 54

8.4

Er.07: CPU Error....................................................................................................................................................... 55

8.5

Er.08: Memory Error ............................................................................................................................................... 55

8.6

Er.09: Emergency Stop ........................................................................................................................................ 55

8.7

Er.10: Power Supply Voltage Drop ............................................................................................................. 55

8.8

Er.11: Instantaneous Voltage Drop ............................................................................................................ 55

8.9

Er.12: Frequency Error ........................................................................................................................................ 56

8.10

Er.13: Heater Disconnection ............................................................................................................................ 56

8.11

Er.04, Er.05, Er.06, Er.14: Self-diagnostic Function ...................................................................... 57

UNIT OUTLINE ............................................................................................................................ 58
9.1

External Dimensions .............................................................................................................................................. 58

9.2

External View .............................................................................................................................................................. 60

10 MAINTENANCE PARTS ...................................................................................................... 63
10.1

Fuse ................................................................................................................................................................................... 63

10.2

Cooling Fan .................................................................................................................................................................. 63

11 CONVERSION BOARD (OPTIONAL).......................................................................... 64
11.1

Before Use .................................................................................................................................................................... 64
Checking the product ........................................................................................................................ 64
How to install the conversion board ....................................................................................... 65
Connection diagrams.......................................................................................................................... 65

11.2

Functions ....................................................................................................................................................................... 66
Model list ...................................................................................................................................................... 66
Feedback control ................................................................................................................................... 67
Detection value adjustment function ..................................................................................... 70
Heater disconnection detection function............................................................................. 71
Heater disconnection detection (standard version) ..................................................... 72
11.2.5.1

Operation overview .................................................................................................... 72

11.2.5.2

Setting method .............................................................................................................. 73

Heater disconnection detection (highly functional version) ................................... 74

11.3

11.2.6.1

Operation overview .................................................................................................... 74

11.2.6.2

Connection method ................................................................................................... 75

11.2.6.3

Setting method .............................................................................................................. 75

Characteristics ........................................................................................................................................................... 77
Constant current control ................................................................................................................. 77
Constant voltage control ................................................................................................................. 78
Constant power control ................................................................................................................... 79
Constant power control (built-to-order products) ....................................................... 80

11.4

External View .............................................................................................................................................................. 81

12 MAINTENANCE AND INSPECTION ............................................................................ 82
13 TROUBLESHOOTING ............................................................................................................ 833

14 UNIT SPECIFICATIONS ........................................................................................................ 85
15 OPTIONAL ITEM SPECIFICATIONS ............................................................................ 87
APPENDIX A.
PARAMETER LIST ................................................................................... 89
APPENDIX B.
PANEL TRANSITION DIAGRAM .................................................... 94
APPENDIX C.
ERROR CODE LIST .................................................................................. 95

4

1

SAFETY PRECAUTIONS
Read this instruction manual to ensure that work is performed correctly and safely.
In order to prevent injury to people, and to prevent damage to property, the following label
categories and symbols are used to explain the items that must be observed.
Explanation of label categories

WARNINGCAUTION

This indicates information that involves the risk of death or serious
injury.

This indicates information that involves the risk of injury or property
damage.

Explanation of symbols

RequiredThis is an item that must be carried out.

Prohibited

This is an item that is prohibited.

5 Installation, wiring, maintenance, and inspection must all
be performed by contractors who specialize in this work.
 Before installing, wiring, maintaining, and inspecting thisproduct, turn OFF the input power supply of the
distribution panel and check that the power supply is OFF.
 Secure a safe space before performing installation, wiring,
maintenance, and inspection.
 Remove wristwatches and other such metal objects andwear clothing that is appropriate in terms of safety before
performing installation, wiring, maintenance, andRequiredinspection. There is the risk of electric shock or injury if
you perform work while wearing metal objects.
 When performing installation, wiring, maintenance, andinspection, use tools for which insulation countermeasures
have been carried out. There is the risk of electric shock if
you use other tools.
 If you detect an odd smell or sound, stop work immediately
and stop operating the product. There is the risk of fire if
this instruction is not followed.
 Do not use the product with the unit cover open. There is

WARNINGthe risk of electric shock if this instruction is not followed.
 Do not insert fingers, metal bars, etc. into the openings.
There is the risk of electric shock or injury if this
instruction is not followed.
 While input power is supplied, do not touch theconducting parts or the wires. There is the risk of electric
shock or burns if this instruction is not followed.
 During installation, wiring, maintenance, and inspection,

Prohibited

individuals other than the workers must not touch the
distribution panel. Workers must prevent others fromeasily touching the distribution panel by erecting a sign
stating “Do not turn the power ON.” Individuals other than the workers must not enter the
installation, wiring, maintenance, or inspection work area.
Workers must prevent others from easily entering this area
by erecting a sign stating “No entry.”61.1 Usage/Storage Location
Do not use or store the product in locations such as thefollowing. There is the risk of fire due to factors such as
product failure, damage, and deterioration if this instruction
is not followed.
 Hot, cold, or humid locations that are not in compliancewith the operating environments specified by the
instruction manual.
 Locations exposed to direct sunlight Locations subject to vibration or impact

CAUTION

Prohibited Locations close to a device that produces sparks
 Locations exposed to direct contact with heat from adryer or other heat source Locations exposed to contact with water Locations where there is dust, salt, corrosive gas, or
flammable gas
 Outdoors

1.2 Installation
 Depending on the product specifications, the unit weight
may exceed 15 kg. Keep safety in mind during installation.
For example, perform the work with two or moreindividuals.
 Install the unit so it is oriented vertically. Orienting the unithorizontally will cause its temperature to increaseabnormally, leading to product failure.
 Install the product so its front door can be opened andclosed.
 Provide sufficient space on the top, bottom, left, and rightof the unit for heat dissipation.

CAUTION

Required7

1.3 Wiring
 Use wires whose dielectric strength corresponds to thecircuit voltage. There is the risk of electric shock if you use
wires without dielectric strength.
 Fully cover the input and output terminals and the
conducting parts of the wires with tubes, tape, or other

WARNING

such insulating objects. There is the risk of electric shock if

Required

you touch exposed parts. If the input and output terminals
cannot be fully covered, ensure that direct contact withthe exposed parts is not possible.
 Use wires with the appropriate diameters to wire the input
and output terminals. There is the risk of heating or fire if
the wire diameters are too small.
 Use crimp terminals with the appropriate size to wire the

CAUTION

Required

input and output terminals. There is the risk of heating or
fire if the crimp terminals are not the appropriate size.

1.4 Maintenance/Inspection
 Replace parts with ones having the same ratings andmodel. There is the risk of fire if different parts are used.

Required Do not touch the transformer, heat dissipation fins, andother such parts that reach high temperatures. There is

WARNINGthe risk of burns if this instruction is not followed, even

Prohibited

after the input power supply is turned OFF (at which timethese parts may still be hot).

8

2

PRECAUTIONS DURING USAGE
Pay attention to the following when using the unit.
 The main circuit thyristor may be damaged in short circuit mode. To prevent fire andproperty damage in case of ground faults, ensure that the design is safe by, for example,
installing protective functions on the power input side of the unit main circuit using breakers
or other devices.
 It is not recommended to operate this product while switching the output between 0% and100% at intervals of a few minutes repeatedly. The main circuit thyristor will reach the upper
limit of the power cycle, breaking down earlier than specified. Reduce the output variation
range, select a model with sufficient capacity for the rated current, or take other measures
to prevent the early breakdown.
 To wire the main circuit, use cables with sufficient capacity for the rated current of the unit.
 To wire the main circuit, connect the K terminal to the power supply side and the L terminal
to the load side.
 Be sure to match the phases of the main circuit power supply and the control circuit power
supply.
 Do not bundle the control circuit cables together with the main circuit cables.
 When storing the unit in the distribution panel cabinet, provide ventilation in consideration of
the internal calorific value of the unit.
(See “9 UNIT OUTLINE” for the internal calorific value.) Note that dust, moisture, overheating, vibration, and other issues may degrade theperformance of the unit or cause it to fail.
 Be sure to install the unit upright and vertical and keep space around the unit as instructedin the installation precautions. Installing the unit horizontally or reducing the space may
degrade the cooling performance, and may lead to abnormal high temperature.
 Install the unit so that its front door can be opened and closed for maintenance orinspection.
 When operating the unit with cycle control, it is preferable to use a fuse-attached model ofthe unit.
 The unit cannot be operated with cycle control with inductive loads. Be sure to operate theunit with phase control when inductive loads are applied.
(Contact us for customized products.)
 If the load capacity is small, a leakage current is applied to the load side even when thesignal is off, causing malfunctions. To prevent this, connect a bleeder resistor in parallel withthe load. (The minimum load current is 1 A.) If the load capacity is small (approximately 10% of the rated capacity or lower), error code
Er.14 is displayed with the self-diagnostic function. This, however, does not cause any
problems during operation.
 Do not apply 5 V or more or 20 mA or more from the temperature controller.
9 A load must be connected during test operation. When test operation is performed with noload, voltage continues to be applied to the output terminal. Additionally, do not perform test
operation with no load while the external potential transformer (PT) is connected. Doing so
may damage the unit.
 When the unit is operated with an inductive load (including a transformer load) and thefeedback PT, resonance may be caused due to the load being low or nonexistent, generating
abnormal voltage. Additionally, when the unit is operated with a transformer load, voltage
higher than the rating may be generated on the load side of the unit due to surge voltage
caused by gate blocking (including the unit being turned ON/OFF with the GT terminal),
power supply stoppage, or other causes. When the unit is operated under the above
conditions, install a CR absorber on the load side of the unit as shown in the following figure.

UG1 unit•Inductive loadC

•Transformer load

〜

•PT
R

Unit current•Meter200 V system unit(A)

Capacitor (µF)

25 to 100

0.5 (400 VAC)

150 to 350
450

Resistor (Ω)

400 V system unit
Capacitor (µF)

Resistor (Ω)

50 (120 W)

1 (800 VAC)

50 (120 W)

1 (400 VAC)

20 (120 W)

1 (800 VAC)

20 (120 W)

2 (400 VAC)

20 (120 W)

2 (800 VAC)

20 (120 W)

103

CHECKING THE PRODUCTCheck the following before installation.
 Check that the product and parts with the correct specifications are included as ordered.

No.

(1)

(2)

(3)

(1)

(2)

(3)

(4)

(5)

(4)

Included item name

Quantity

1

UG1 unit

1

2

Screws, nuts, etc. for output wiring(1) Screw

For models with a rated

2

current of 25 to 250 A(2) Bolt

2(3) Washer

Models with a rated

4

current of 350 or 450 A(4) Spring washer

2(5) Nut

2

3

Ground terminal connection screw

1

4

Adjuster set(1) Adjuster (1 kΩ, B characteristic)

1(2) Knob

1(3) Insulating sheet

1(4) Nameplate2(manual output adjustment, gradient setting)5

Easy lock2

6

Cautionary guide1

11 Check that the optional items with the correct specifications are included as ordered.
For included items, refer to the installation manual that comes with each optional item.
Optional item

Model

Optional item that needs to bepurchased separately

Display panel

UG-DP

Extension cable

Conversion

UG-TB*** (eight types including 1A

Current transformer (CT), PT

board

and 1V)

Communication

UG-CL, UG-MB

–

board

12

4

UNIT CONNECTION DIAGRAM
2000

Display circuit
PCB3

1A
1C
HA
HC
+
S
PS
RT
HL
AT
ST
GT
PH
VE3
VF2
VH2
VL2
VE1
I1
D1
V1

CN502

Conversion
board
UG-TB

Control
board
PCB1

CN503

Communication
board
UG-CL
UG-MB

Power supply, gate board
PCB2

TF1
THS1

FAN1
THY1

F1

CT1
Snubber circuit
PCB4

K

L

E

Power
supplyLoad

THY

Thyristor

CT

Current transformer

FAN

Cooling fan (air-cooled models only)

PCB

Printed circuit board

F

Fuse (only models with a fuse)

CN

Connector

TF

Fuse warning contact (only models with a fuse)

THS

Thermal switch※

Ensure that the design is safe by installing protective functions on the input side of themain circuit using breakers or other devices.

※

If the power supplied to the main circuit is not 200/220 V, use a transformer to change
the control power supply to 200/220 V.

※

Wire the main circuit and control circuit with the correct polarities.
13

5

EXTERNAL CONNECTIONS OF THE UNIT

5.1 Control Terminal Block
Wire the control terminal block of the unit according to the following table. (Terminal screw: M3)
Terminal

Description about functions and purposes

200

The inputs for the control power supply. These terminals need0

to be wired according to the main circuit polarity.

When not in use–

Models with a rated current of 25 to 75 A: 25 VA, models witha rated current of 100 to 450 A: 50 VA
1A

External warning relay (1) output signal

1C

The contact is closed when an error occurs. normally open ,Open

250 VAC and 1 A, 30 VDC and 1 A
HAExternal warning relay (2) output signal

HC

The contact is closed when an error occurs. normally open ,Open

250 VAC and 1 A, 30 VDC and 1 A+

Temperature control signal input

Open

S

Connect (+) of temperature controller to (+) terminal and (-) of–

temperature controller to (-) terminal.
Short-circuit “+” with “S” when the temperature controller isa current source. 4 to 20 mA (DC)Open “S” when the temperature controller is a voltage source.
0 to 5 VDC

PS

Temperature control signal output

Open

This terminal is used when a single temperature controller
controls multiple units.
You can also control multiple units by connecting a temperature
controller in parallel with them, instead of using PS.
PS

Advantage

Disadvantage

terminal
Control accuracy can
When
used

be retained even

When the power supply towhen the number of

one unit is interrupted, theunits connected insubsequent units also stop.

parallel increases.
Even when the power

When the number of units

Whensupply to one unit isconnected in parallel increases,

notinterrupted, the otherthe temperature controller

usedunits can continue tosignal level lowers, decreasing

be operated.

the control accuracy.

14

Terminal
VF2

Description about functions and purposes
VF2: Gradient (proportional) signal input

When not in use
Short-circuitedwith VE3

VH2

VH2: Manual (upper limit) signal input

Short-circuitedwith VE1

VL2

VL2: Lower point (lower limit) signal input

Short-circuitedwith VE1

VE3

VE3 – VE1: +5 VDC output for a variable resistor↑

VE1

When a variable resistor (1 kΩ) is connected, the inputs from

* Short-these terminals are used for setting. The output level iscircuiting is notdetermined by a combination of the three inputs. Setting

required when

examples are shown in the following figure.

the settings are
configured via
the panel orcommunication.

Ex.1
Ex.2
Ex.3
Ex.4
HL

Lower point setting
Gradient setting
0%
100%
20%
100%
0%
50%
20%
50%

Two-position control signal input

Open• Short-circuited: Acts according to the manual (upper limit)
setting.
• Open: Acts according to the lower point (lower limit) setting.
AT

Automatic/manual switching signal input• Short-circuited: Automatic (control with a temperature
controller or two-position control)• Open: Manual (control with the manual signal input)

15–

TerminalST

Description about functions and purposes
Start/stop switching signal input

When not in use
Open• Short-circuited: Starts operation. The output is gradually
increased during the soft-start time.
• Open: Stops operation. In the phase control, the output isgradually decreased during the time specified with the soft-starttime.
In the cycle control, the output is stopped regardless of the softstart time.
Start/stop can also be switched using the panel or via
communication, instead of using the ST terminal.
The ST terminal is prioritized over the panel and communication.
The concrete behavior is as follows:• When the start/stop status is switched via the panel orcommunication, ST needs to be opened.
• When ST is short-circuited, the output cannot be stopped via
the panel or communication.
• The output started via the panel or communication stops
when ST is opened, short-circuited, and then opened again.
GT

Emergency stop signal. This terminal is used to stop the output

Short-circuitedin emergencies.

with PH• Short-circuited: Permits the output. If the output has beenswitched to the start status via the ST terminal, communication,or the panel, the output resumes with a soft start when thisterminal is short-circuited.
• Open: Emergency stop. The output is unconditionally,
immediately, and forcibly stopped.
PH

The output of −15 VDC for HL, AT, ST, and GT–

RTConnection prohibited (for maintenance)

Open

V1

Connect this terminal to the 3 V terminal on the secondary sideOpenof the external PT.
D1

Connect this terminal to the l terminal on the secondary side ofOpen

the external CT and the 0 V terminal on the secondary side ofthe external PT.
I1

Connect this terminal to the k terminal on the secondary side ofthe external CT.

16

Open

200
0
1A
1C

200
0
1A

HA
HC

1C
HA
HC
+
VE3
S

+

VH2

-

PS

+

-

HL

Subsequent
units
+

AT

UG1

VE1
RT

ST
V1

0V

L

l

K

k

I1

HL
ST
-15V

0V

PH

VE1

PS

3V

D1

VF2
VH2
VL2

AT

210V

GT

VE3

+
S
-

Temperature
controller(voltage source)

VL2

+5V

+
S
-

Temperature
controller(current source)

V F2
-

UG1

Layout of the control terminal block

V1

GT
PH
RT

D1
I1

Terminal block connection example

5.2 Connection Diagrams for Setting Methods(1) Manual adjustment(2) Two-position control(3) Automatic adjustment 1 (4 to 20 mA [DC])(4) Automatic adjustment 2 (1 to 5 VDC)
(5) Automatic adjustment 3 (0 to 5 VDC)
(6) Manual – Automatic 1 switching (4 to 20 mA [DC])(7) Manual – Automatic 2 switching (1 to 5 VDC)
(8) Manual – Automatic 3 switching (0 to 5 VDC)
(9) Control of two or more UG1 units using a single temperature controller (4 to 20 mA [DC])with the gradient set for each unit
(10) Control of two or more UG1 units using a single temperature controller (1 to 5 VDC) withthe gradient set for each unit
(11) Control of two or more UG1 units using a single temperature controller (0 to 5 VDC) withthe gradient set for each unit

The settings need to be changed on the display panel in addition to establishing the connection
according to the diagrams shown on the following pages.
The settings that need to be changed are expressed as shown in the following instruction.
Change the settings according to “7 DISPLAY PANEL.”
Example: Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].

17

(1)

Manual adjustment
Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].
(1) Standard(2) With the gradient setting

Gradient

ManualManual(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Gradient

ManualManual

Lower
point

Lower
point

18

(2) Two-position control
Set [F101: Temperature controller type] to [2: Two-position control].
(1) Standard(2) With the proportional setting

Ratio
Upper
limit

Upper
limit

Lower
limit

Lower
limit

(3) Upper limit setting only

(4) Upper limit setting
and proportional setting only

Ratio
Upper
limit

Upper
limit

19

(3) Automatic adjustment 1 (4 to 20 mA [DC])Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].
(1) Standard(2) With the gradient setting

Temperature
controller

Temperature
controller

Gradient(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Temperature
controller

Temperature
controller

Gradient

Lower
point

Lower
point

20

(4) Automatic adjustment 2 (1 to 5 VDC)
Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].
(1) Standard(2) With the gradient setting

Temperature
controller

Temperature
controller

Gradient(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Temperature
controller

Temperature
controller

Gradient

Lower
point

Lower
point

21

(5) Automatic adjustment 3 (0 to 5 VDC)
Set [F101: Temperature controller type] to [1: 0 to 5 VDC].
(1) Standard(2) With the gradient setting

Temperature
controller

Temperature
controller

Gradient(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Temperature
controller

Temperature
controller

Gradient

Lower
point

Lower
point

22

(6) Manual – Automatic 1 switching (4 to 20 mA [DC])Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].
(1) Standard(2) With the gradient setting

Temperature
controller

Temperature
controller

Gradient

ManualManual(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Temperature
controller

Temperature
controller

Gradient
ManualManual

Lower
point

Lower
point

23

(7) Manual – Automatic 2 switching (1 to 5 VDC)
Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].
(1) Standard(2) With the gradient setting

Temperature
controller

Temperature
controller

Gradient

ManualManual(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Temperature
controller

Temperature
controller

Gradient

ManualManual

Lower
point

Lower
point

24

(8) Manual – Automatic 3 switching (0 to 5 VDC)
Set [F101: Temperature controller type] to [1: 0 to 5 VDC].
(1) Standard(2) With the gradient setting

Temperature
controller

Temperature
controller

Gradient

ManualManual(3) With the lower point setting(4) With the gradient setting
and the lower point setting

Temperature
controller

Temperature
controller

Gradient

ManualManual

Lower
point

Lower
point

25

(9) Control of two or more UG1 units using a single temperature controller (4 to 20 mA [DC])with the gradient set for each unit

Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].

(1) When the PS terminal is not used

Temperature
controller

Gradient

Gradient

Gradient(2) When the PS terminal is used

Temperature
controller

Gradient

Gradient

Gradient26

(10) Control of two or more UG1 units using a single temperature controller (1 to 5 VDC) withthe gradient set for each unit

Set [F101: Temperature controller type] to [0: 4 to 20 mA (1 to 5 VDC)].

(1) When the PS terminal is not used

Temperature
controller

Gradient

Gradient

Gradient(2) When the PS terminal is used

Temperature
controller

Gradient

Gradient

Gradient27

(11) Control of two or more UG1 units using a single temperature controller (0 to 5 VDC) withthe gradient set for each unit

Set [F101: Temperature controller type] to [1: 0 to 5 VDC].

(1) When the PS terminal is not used

Temperature
controller

Gradient

Gradient

Gradient
Gradient(2) When the PS terminal is used

Temperature
controller

Gradient

Gradient

Gradient

28

6

UNIT CONTROL WIRING METHOD

6.1 Control Wiring Method
Bundle the unit control wires (the wires connected to the control terminal block) with easy locks.
(1) Attach the easy locks to the unit.

(2) Bundle the control wires with the easy locks.
Bundle the control power supply wires separately from other wires.

6.2 Grounding
As the unit is designed to be installed in the distribution panel cabinet, the ground terminal at
the bottom of the unit is not intended to be used as a main circuit ground terminal.
To ground the unit using its ground terminal, connect a wire with a diameter of 1.25 mm andfasten it with the included ground terminal connection screws (M4 × 8).

29

7

DISPLAY PANEL

7.1 Names and Overview of the LED Lamps and Keys
(1)

(2)

Power receiving

This LED turns ON when powerLEDis supplied to the control circuit.

Error LED

This LED turns ON when anerror occurs.

(3)

Operation

This LED is ON during operation.

status LED

It flashes while an error is
occurring during operation.
It turns OFF when operation
stops, including stops due toerrors.

(4)Mode LEDs

The LED of the current screenmode turns ON.

(5)

(6)

Setting changeThis LED is ON during Setting

LED

mode.

Communication

This LED is ON during operationLEDof the optional communication
function.

(7)

(8)

Phase

For the UG1 units, these LEDs

indication LEDs

are always OFF.

7seg LED

Displays each mode or function
with numeric values. When anerror occurs, its code is also
displayed here.

(9)

Unit LEDs

The unit corresponding to thevalues displayed on the
7seg LED turns ON.

Starts or stops the output. However, the external

RUN/STOPterminals (ST–PH) take priority over this key. See thekey

explanation about the ST terminal in “5.1 Control
Terminal Block.”

MODE key
ENTER key

Switches the display mode.
MONITOR → FUNCTION → PARAMETER → OPTION

Proceeds to the next item.

30

ESC key
UP keyDOWN key
LEFT key
RIGHT key

Returns to the previous item.
‘Select parameters’or‘increase/decrease the value’

Change the selected digit of a value.

SAVE key

Applies changed on values.

PHASE key

For the UG1, this key is not used.

7.2 Operations
This section describes basic operations common to all modes. Details are explained in thesection of each mode on the following pages.

Selecting and displaying modes and items
 The lit mode LED changes every time [MODE] is pressed.

 Press [▲] or [▼] to select an item.

 Press [ENTER] to display the next item selection or value.

 Press [ESC] to return to the item selection.

31

Changing settings(1) Select the item whose settings will be changed.
(2) Press [ENTER].
The [SETTING] LED turns ON.

(3) Change the value.
Press [◀] or [▶] to move the digit to set. The selected digit flashes.

Press [▲] or [▼] to increase or decrease the value. The value increment/decrement differs
according to the item.

Press [ESC] to cancel the change and return to the item selection.

(4) Press [SAVE] to set the value.

(5) Press [ESC] to return to the item selection.

32

7.3 Modes
MONITOR mode
The output current, voltage, and power can be checked in MONITOR mode.

Displayed

Display range

Unit

Function

detection
value
Current0toVoltage

0.0

to

Power

0.0

to

1000

to

9999

A

The output current is displayed.

999.9

V

The output voltage is displayed.

999.9

kW

The output power is displayed.

9999

The checkable detection values differ according to the optional conversion board model. The
values to be displayed are also different. For details, see “11.2.1 Model list.”
Conversion
board

Conversion

Checkable detection valueboard model

model
Current

Voltage

Power

None

✓

✓

―

UG-TB1A✓✓UG-TB1V✓UG-TB3UG-TB3U

Checkable detection value

Current

VoltagePower

UG-TB3H

✓

✓

✓

―

UG-TB3HU

✓

✓

✓

✓

―

UG-TB4

―

―

✓

✓

✓

✓

UG-TB4H

―

―

✓

✓

✓

✓

33

PARAMETER mode
The major settings can be checked and changed in PARAMETER mode.
The values that are used for operation are displayed on 7segLED. (See “7.3.3.3 F2: Parameterpriority.”) During Setting , 7segLED displays values set via the panel or communication.
※

Setting values are ignored when [0: Control terminal block] is selected for [F2: Priority
setting].

Parameter list
Display
symbolP

H

Name

Temperature
control signal
Manual (upper
limit) signal

Setting range

Increment

Unit

Default
value

Changeabl
e during
operation

0.0

to

100.0

0.1

%

0.0

✓

0.0

to

100.0

0.1

%

0.0

✓

0.0

to

100.0

0.1

%

0.0

✓

0.0

to

100.0

0.1

%

100.0

✓

Lower pointL(lower limit)
signalF

Gradient

34

DisplaysymbolName

Incremen

Setting range

t

Unit

Default
value

Changeabl
e during
operation(proportional) signal
EC

Soft-start time
Current limit
amount

0.0

to

300.0

0.1

s

0.5

✓

10

to

110

1

%

110

✓

5

to

50

1

%

50

✓

HeaterUdisconnection
amountd

Delay time

0.0

to

3.0

0.1

s

0.0

✓

t

Period

1.0

to

3.0

0.1

s

1.0

✓

0

to

7

1

No.

0

✗

n

Functioncharacteristics↑(“during operation”... the operation status LED is ON or flashes, i.e. output is generated.)Parameter overview
 P: Temperature control signal
One of the output setting signals, this signal functions in the same way as the “+,” “S,”and “–” terminals on the control terminal block. If [F2 P: Priority setting] is set to [0: Control
terminal block], the value set with the temperature controller can be checked when this item
is selected If [F2 P: Priority setting] is set to [1: Panel] or [2: Communication], the value canbe set via the panel or communication as a substitute for the temperature controller.
 H: Manual (upper limit) signal
One of the output setting signals, this signal functions in the same way as the “VH2”
terminal on the control terminal block. If [F2 H: Priority setting] is set to [0: Control terminal
block], the value set with the variable resistor can be checked when this item is selected. If[F2 H: Priority setting] is set to [1: Panel] or [2: Communication], the value can be set via thepanel or communication as a substitute for the variable resistor input.
 L: Lower point (lower limit) signal
One of the output setting signals, this signal functions in the same way as the “VL2”
terminal on the control terminal block. If [F2 L: Priority setting] is set to [0: Control terminal
block], the value set with the variable resistor can be checked when this item is selected. If[F2 L: Priority setting] is set to [1: Panel] or [2: Communication], the value can be set via thepanel or communication as a substitute for the variable resistor input.

35 F: Gradient (proportional) signal
One of the output setting signals, this signal functions in the same way as the “VF2”terminal on the control terminal block. If [F2 F: Priority setting] is set to [0: Control terminal
block], the value set with the variable resistor can be checked on when this item is selected.
If [F2 F: Priority setting] is set to [1: Panel] or [2: Communication], the value can be set via
the panel or communication as a substitute for the variable resistor input.
 E: Soft-start time
This parameter is set to adjust the time during which the output changes between 0% and100% when the operation starts or stops (only in the phase control) or the output setting
signal changes. If this parameter is set to 0.0 seconds, the operation is executed immediately
at the output setting signal value. The following figure shows an example of phase control
with a soft-start time of 10.0 seconds.

Operation start/stop

Stop

Output setting signal

Stop

Operation

100%

25%

Output voltage

10.0s

7.5s

2.5s

 C: Current limit amountThis parameter is used to set the threshold of the current limit function. The current limit
function protects the unit or load by limiting the output current when it exceeds the rating of
the unit or load due to load fluctuations. The output current is limited so as not to exceed
the value of the rated current × current limit. (Specifications: The setting is limited to therange of ±0% to −10%.)※

This function does not prevent inrush currents.

※

This protective function is effective for load fluctuations caused by initial heater
heating and similar phenomena.

 U: Heater disconnection amountThis parameter is used to set the threshold for the heater disconnection detection function.
For details on the function, see “11.2.4 Heater disconnection detection function.”36 d: Delay time
This parameter adjusts the delay function time. The delay function is used for multiple units
operated with the continuous cycle control method. The units can start in sequence after
the delay time specified for each unit even when the start/stop switching signal turns ON
simultaneously. This ON time lag reduces the amount of power supply usage during normal
operation.
※

This function can be enabled only for operation with the continuous cycle control
method.

 t: Period
This parameter adjusts the interval of the continuous cycle control method shown in thefollowing figure.

Interval t
 n: Function characteristics
This parameter is used to select the characteristic number of the function characteristic
function. The default relationship between the control signal and output level has a linear
characteristic. The characteristic can be switched using this parameter.
100.0%
90.0%
80.0%

70.0%

Output voltage

60.0%

No.0(linearity)

50.0%

No.1(1.6th root characteristic)
No.2(1.8th root characteristic)

40.0%

No.3(2.0th root characteristic)

30.0%

No.4(2.2th root characteristic)
No.5(2.5th root characteristic)

20.0%

No.6(3.0th root characteristic)

10.0%
0.0%
0.0%

No.7(average characteristic)
20.0%

40.0%

Setting

37

60.0%

80.0%

100.0%

FUNCTION mode
The setting of each function can be changed in FUNCTION mode. A function code is assigned
to each function. You can check and change the setting by selecting the corresponding
function code.

Function code categories
Function code

Category overview

Function code

Category overview

F0

Rated value

F4

Conversion board

F1

Control method

F5

Communication board

F2
F3

Parameter priority

F6

Function characteristics

F7
38

Error output destination
selection
System setting

Code

F000

F001

Function nameRated current
setting
Rated voltage
setting

Setting range

Increment

1

to

9999

0.1

to 999.9

Unit

Default
value

Changeable
duringoperation

1

A

*1

✓

0.1

V

*2

✓

(*1: Rated current value of unit model.)(*2: Rated voltage value of unit model.) Rated value setting
The output current, output voltage, and output power displayed in MONITOR mode areconverted on the basis of [F000] and [F001]. To display them correctly, you must set the
rated values according to the usage conditions. Appropriate values differ according to theusage status of optional items. See the following table to set the values.
Conversion board to
use

CT to use

Rated current

Rated voltage

settingsetting[F408][F407][F000][F001]

None

Built-in CT

(1)

(3)

UG-TB1A

Built-in CT

(1)

(3)

(2)

(3)

External CT(optional item)UG-TB1V

Built-in CT

(1)

(4)

UG-TB3

Built-in CT

(1)

(4)

UG-TB3H

External CT

(2)

(4)

UG-TB3HU(optional item)UG-TB4External CT

(2)

(4)

UG-TB4H(optional item)UG-TB3U(1) Set the rated current to that specified for the unit model.
(2) Set the rated current to that specified for the primary side of the main circuit CT. (Thevalue indicated with ■■ in the following figure)(3) Set the rated voltage to that calculated with the following formula.
Voltage = Main circuit input voltage ×

39

200
Control circuit input voltage

(4) Set the rated voltage to that specified for the primary side of the external PT (optional
item). (The value indicated with ▲▲ in the following figure.)
I1
D1
V1

UG1
K

L
▲▲V

3V

0V

0V

External PT
K

k

L

l

K

k

L

l

External CT (optional item)

Load

Main circuit CT (prepared by user)■■A：5A
5A：0.1A
Main circuit CT External CT

CodeFunction name

Setting range

Increment

Unit

Default
value

Changeable
duringoperation

0: Phase control

F100

1: Intermittent cycle

Waveform
control method

control

–

–

0

✓

–

–

0

✗

2: Continuous cycle
control
0: 4 to 20 mA

F101(1 to 5 VDC)

Temperature
controller type

1: 0 to 5 VDC
2: Two-position
control F100: Waveform control method
Select the waveform control method.
The following three methods are available: phase control, intermittent cycle control, andcontinuous cycle control. Each has the following characteristics.
Phase control

Overview

Load to apply

Intermittent cycle

Continuous cycle

control

control

The phase is

The number of ONs in a cycle during acontrolled once every

specified period is controlled with the effective

half cycle using thevalue.

effective value.

Period: Automatically

Period: Fixed at an

adjusted

arbitrary value

Resistance load,

Resistance load

inductive load,(Customized product: Transformer primarytransformer primarycontrol)

control
40

Phase control

Feedback

Intermittent cycle

Continuous cycle

control

control

Available

Available

Not available

ResponsivenessHigh speed

Middle speed

Low speed

Harmonics

May occur

Can be reduced

Flickering

None

May occur

control

May occur(May be reduced withthe delay function)
Interval

Output voltage

Phase control

Output cycles(effective value)

Output cycles(effective value)Intermittent cycle control

Continuous cycle control F101: Temperature controller type
Select the temperature controller type.

CodeFunction name

Setting range

Increment

Unit

Default
value

Changeable
duringoperation

Priority of theF2_P

temperature

0: Control terminal

controller signal

block input

0

✗

0

✗

0

✗

0

✗

(P)
Priority of theF2_H

upper limit signal

1: Panel––(H)
Priority of theF2_Llower point

2: Communication

signal (L)Priority of theF2_F

gradient signal
(F)
41

Code

Function name

Setting range

Increment

Unit

Default
value

Changeable
duringoperation

Priority of the
F2_E

soft-start time

1

✗

1

✗

1

✗

1

✗

1

✗

1

✗

(E)
Priority of theF2_C

current limit
amount (C)Priority of the

F2_U

heaterdisconnection

1: Panel––amount (U)
F2_d

F2_t

Priority of thedelay time (d)2: Communication

Priority of theinterval (t)Priority of the

F2_nfunctioncharacteristics(n)

The parameter values that can be checked and changed in PARAMETER mode can be set
using multiple methods. You can select the method to use for each parameter.
 [0: Control terminal block input] selected
The signal applied to the control terminal block is used as the setting. The value entered on
the setting screen in PARAMETER mode is ignored. Requests to rewrite the setting sent via
communication are also ignored.
 [1: Panel] selected
The value entered on the setting screen in PARAMETER mode is used as the setting. The
signal applied to the control terminal block is ignored. Requests to rewrite the setting sent via
communication are also ignored.
 [2: Communication] selected
The value entered on the setting screen in PARAMETER mode is used as the setting andcan be rewritten via communication. The signal applied to the control terminal block isignored.

42

Code

Function name

Setting range

Increment

Unit

Selection of
F300

target to

Default
value

Changeable
duringoperation

1
1

to

7

1

No.

✗

0

to

100

1

%

–

✗

%

–

✗

change―0.0% of setting…
―(The setting can be selected in increments of 10%.)100.0% ofsetting

0

to

100

1

The standard function characteristics can be modified to other characteristics using thisfunction.
Step 1: Select the characteristic number to adjust with [F300: Selection of target to change].
Step 2: Select the horizontal axis setting for the graph in the range of [0.0% of setting] to[100.0% of setting].
Step 3: Adjust the vertical axis of the graph on the setting screen.

Step 2

Step 3

Step 143

100.0%
90.0%
80.0%
70.0%

Output voltage

60.0%

No.0(linearity)

50.0%

No.1(1.6th root characteristic)
No.2(1.8th root characteristic)

40.0%

No.3(2.0th root characteristic)

30.0%

No.4(2.2th root characteristic)
No.5(2.5th root characteristic)

20.0%

No.6(3.0th root characteristic)

10.0%

No.7(average characteristic)

0.0%
0.0%

20.0%

40.0%

60.0%

80.0%

100.0%

Setting
In the panel operation example, this point is adjusted.

This function is used to set the optional conversion board.

CodeFunction name

Setting range

Increment

Unit

Default
value

Changeable
duringoperation

0: No feedback
1: Constant current

F400

Feedback
control method

control
2: Constant voltage

–

–

0

✗

–

–

0

✗

–

2

✗

control
3: Constant power
control
0: Disable standard
versionF401

Heater

1: Disable highly

disconnection

functional version

detection

2: Enable standard

functionversion
3: Enable highly
functional version

F402

Heater A count

1

to

5
44

1

Code

Function name

F403

Heater B countCurrent gain

F404

adjustment
Voltage gain

F405

adjustment
Power gain

F406

adjustment

F407

CT selection

Setting range

Increment

Unit

Default
value

Changeable
duringoperation

1

to

5

1

–

1

✗

1

to 9999

1

A

–

✓

1

to 999.9

0.1

V

–

✓

1

to 999.9

0.1

kW

–

✓

–

–

0

✗

–

–

0: External CT
1: Built-in CT

Conversion
F408

board model(No setting)

–

–

check
 F400: Feedback control method
Select the feedback control method. The selectable values depend on the connected
conversion board model. For details on the models, see “11.2.1 Model list.” F401: Heater disconnection detection function
Select the heater disconnection detection function mode and enable/disable the function.
The heater disconnection detection function has two selectable modes: the standard version
and the highly functional version. This function can be temporarily disabled with thisparameter.
Select the setting that matches the desired combination of the mode and enabled/disabledstate.
Setting

Mode

Enabled/disabled0Standard

DisabledversionCondition
When the conversion board model does notsupport heater disconnection detection. Or,
when the circuit is connected for the standard
version, but the function needs to be disabled
temporarily.

1HighlyDisabledfunctional

functional version, but the function needs to beversion2

Standard

disabled temporarily.
Enabledversion3

HighlyfunctionalversionWhen the circuit is connected for the highly※

When the circuit is connected for the standard
version, and the function needs to be enabled.

EnabledWhen the circuit is connected for the highly
functional version, and the function needs to beenabled.

45

The selectable values depend on the connected conversion board model. For details on themodels, see “11.2.1 Model list.” For details on the heater disconnection detection function,
see “11.2.4 Heater disconnection detection function.”※

When the highly functional version is used and needs to be temporarily disabled, besure to set the value to [1: Disable highly functional version]. Failure to do so may
cause incorrect feedback control, leading to overcurrent.

 F402: Heater A count, F403: Heater B countSpecify the number of heaters connected in parallel for the highly functional version of theheater disconnection detection function. For details on this version, see “11.2.6 Heater
disconnection detection (highly functional version).” F404: Current gain adjustment, F405: Voltage gain adjustment, F406: Power gain
adjustment
When accuracy is required for the feedback control, the detection values can be corrected.
For details on the correction procedure, see “11.2.3 Detection value adjustment function.” F407: CT selection
Select the CT used to detect the current and power. The following table shows thecharacteristics.
[0: External CT][1: Built-in CT]

Required

Not required

Required

Not required

Main circuit CT
External CT(optional item)

NormalAccuracy(according to the conversion
board model.)Simplified• Input fluctuation: ±5%• Load fluctuation: ±5%• Temperature fluctuation: ±5%

 F408: Conversion board model check
You can check whether the conversion board is connected correctly. The displayed content
differs according to the conversion board in use. Check that this content matches the modelof the conversion board in use.
Conversion board model

F408 display

UG-TB1AUG-TB1VUG-TB3, UG-TB3H

UG-TB3U, UG-TB3HU

46

Conversion board model

F408 display

UG-TB4, UG-TB4H(When no conversion board
is connected)

This function is used to set the optional communication board.

CodeFunction name

F501

Setting range

Node address
Transmission

F502

rate

F503

0

to 255

Transmission[8n1], [8o1], [8E1],

mode[8n2], [8o2], [8E2]

latency0

to 999Unit

1[9.6], [19.2], [38.4]

Transmission

F507

Increment

Default
value

Changeable
duringoperation

–

1

✗

–

kbps

[9.6]

✗

–

–

[8E1]

✗

ms

0

✗

1

These settings may not be required depending on the communication board model, so checkthe model before configuring the settings.
Communication board model
UG-MBR

Handling of F5 function codes
The settings can be changed as necessary.
The settings are not required. Use the communication
board with the default values.

UG-CL* The communication board may fail to operate if thedefault values are changed.

 F501: Node address
Set the slave address of the unit.
※

Do not to specify an address used by another unit. Doing so may cause incorrect
operation.

※

The Modbus protocol permits decimal values from 0 to 247. Be careful when
specifying other numbers.

※

Address 0 is intended for broadcasting.

 F502: Transmission rate
Set the transmission rate of the unit. Set it to match that of the master.

47

 F503: Transmission mode
Set the transmission mode of the unit. Set it to match that of the master.
F503 setting

Data bit length

ParityStop bit length

8n1

8 bits

None

1 bit

8o1

8 bits

Odd

1 bit

8E1

8 bits

Even

1 bit

8n2

8 bitsNone

2 bits8o2

8 bitsOdd

2 bits8E2

8 bitsEven

2 bits F507: Transmission latency
Set the time from when the unit receives data from the master to when it starts responding.
When the unit responds too quickly, a time lag can be set to allow the master to receive
data.

Code

Function name

Setting range

Increment

Unit

Default
value

Changeable
duringoperation

Er.01:
F601

Overcurrent

–

–

1

✗

–

–

1

✗

–

–

1

✗

0: No output

–

–

1

✗

1: Output to 1A-1C

–

–

1

✗

2: Output to HA-HC

–

–

1

✗

3: Output to both

–

–

0

✗

–

–

0

✗

detection
Er.02:
F602

Temperature rise
error

F603

Er.03: Fuseblowout
Er.04: Self-

F604

diagnosis
Load shortcircuit error
Er.05: Self-

F605

diagnosis
Thyristor open
Er.06: Self-

F606

diagnosis
Thyristor shortcircuit

F607
F608

Er.07: CPU error
Er.08: Memory
error

48

Code

F609

Function name

Setting range

Er.09:
Emergency stop

Increment

Unit

Default

Changeablevalue

duringoperation

–

–

0

✗

–

–

2

✗

–

–

2

✗

–

–

2

✗

–

–

2

✗

–

–

2

✗

Er.10: Power
F610

supply voltage
drop
Er.11:

F611

Instantaneousvoltage drop

F612

F613

Er.12: Frequency
error
Er.13: Heater
disconnection
Er.14: Self-

F614

diagnosis
Load open error

With this function, the output destination of the external warning relay signal, which is output
when an error occurs, can be selected for each error code. For details on the error codes, see“8 ERROR DETECTION.”※

This function does not disable the error detection. It is used to simply switch the relay
contact output destination. The settings of this function do not change the output
stoppage, error code display, and other operations taken when an error occurs.

 When [0: No output] is selected
The external warning relay signal is not output. This setting does not disable the error
detection.
 When [1: Output to 1A-1C] is selected
The signal is output to 1A-1C (external warning relay [1]) on the control terminal block.
 When [2: Output to HA-HC] is selected
The signal is output to HA-HC (external warning relay [2]) on the control terminal block.
 When [3: Output to both] is selected
The signal is output to both 1A-1C (external warning relay [1]) and HA-HC (external
warning relay [2]) on the control terminal block.

49

Code

F700

Function nameSelf-diagnosis
RUN/STOP key

F701

lock

F702

SAVE key lock

Setting range

Increment

0: Temporary STOP
1: Enable
0: Unlock
1: Lock
0: Unlock
1: Lock

Unit

Default
value

Changeable
duringoperation

–

–

1

✗

–

–

0

✗

–

–

0

✗

 F700: Self-diagnosis stop
The self-diagnostic function can be suspended for test operation or other purposes.
 F701: RUN/STOP key lockPressing the RUN/STOP key on the display panel can be disabled. This setting disables thestarting and stopping of the output from the display panel. (Start/stop switching via the ST
terminal on the control terminal block or via communication remains enabled.)
 F702: SAVE key lockPressing the SAVE key on the display panel can be disabled. This setting cannot change theparameters. (Parameter changing via communication remains enabled.)
Unlocking method: Select [0: Unlock] on the F702 setting screen and press the SAVE key.

50

OPTION mode
OPTION mode allows you to check the error history and other items.

The detected error history can be checked. The last 10 errors can be checked.
Error history display contents
1st digit: Displays the time when the error was detected.
2nd digit: Always displays “E.”3rd and 4th digits: Display an error code. If the number of past errors is less than nine, “--”is displayed to indicate there is no record in the history.
Concrete examples are shown below.
※

Errors that occur in certain situations are not added to the history. For details, see “8ERROR DETECTION.”

This indicates that theThis indicates that theThis indicates that thelast error detected issecond last error

tenth last error

Er.02: Temperature rise

detected is Er.09:

detected does not exist

error.

Emergency stop.

in the history.

Set the heater resistance used in standard version mode of the optional heater disconnection
detection function. For details on the function and setting method, see “11.2.5 Heater
disconnection detection (standard version).”51

8

ERROR DETECTION
An error code is displayed on the panel when the error detection circuit is activated. When thepanel is operated with an error code displayed, the panel temporarily displays normal screens. If
no operations are performed for 5 seconds, the error code appears again.
Behavior

Error

Function name

code

Er.01

Er.02

Er.03

Er.04

Er.05

Er.06

Er.07

Er.08

Er.09

Er.10

Er.11

Er.12

Er.13

Er.14

after
detection

Overcurrent detection

RecoverymethodOperation

Power

stops

OFF

Operation

Power

stops

OFF

Operation

Power

stops

OFF

Operation

Power

stops

OFF

Operation

Power

stops

OFF

OperationPowershort circuit

stops

OFF

CPU error

Operation

Power

stops

OFF

Operation

Power

stops

OFF

Operation

Automatic

stops

recoveryOperation

Automatic

stops

recoveryOperation

Automatic

stops

recoveryOperation

Automatic

continues

recoveryOperation

Automatic

continues

recoverySelf-diagnosis: Load

Operation

Automatic

open

continues

recoveryTemperature rise error

Fuse blowout

Self-diagnosis: Loadshort circuit
Self-diagnosis: Thyristor
open
Self-diagnosis: Thyristor

Memory error

Emergency stop

Power supply voltage
drop
Instantaneous voltage
dropFrequency error

Heater disconnection

52

Relay
outputError history

destination
Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

None

Not saved

None

Not saved

None

Saved (only during
operation)

Relay (2)

Saved (only during
operation)

Relay (2)Not saved

Relay (2)Not saved

Relay (2)Not saved

Relay (2)Not saved Behavior after detection
Operation

The unit stops operation, displays an error code, and outputs the external

stops:

warning relay signal according to the setting of [F6: Error output destination
selection].

Operation

The unit displays an error code and outputs the external warning relay signal

continues:

according to the setting of [F6: Error output destination selection]. The unit
continues operation.

 Recovery method
Power

Stop the power supply and remove the causes of the detected error.

OFF:

Operation resumes when power is supplied again. Stopping the power supply
turns the external warning relay output OFF.
※

Errors may be detected again if the power is turned back ON without
first removing the error causes. The unit may be damaged if it
repeatedly stops due to errors.

Automatic

The unit resumes operation when the causes of the detected error are

recovery:removed. The external warning relay output is also turned OFF.

 Relay output destination
The above table shows the default values specified with [F6: Error output destination
selection].
Relay (1):The signal is output between 1A and 1C on the control terminal block.

Relay (2):The signal is output between HA and HC on the control terminal block.

None:

The signal is not output to the external warning relay on the control terminal
block.

 Error history
Errors that occur in certain situations are not added to the history.

53

8.1 Er.01: Overcurrent Detection
Detection

The built-in CT detects that a current that is at least 1.5 times larger than thecondition:

unit’s rated current flowed continuously for more than a few cycles.

When

The output stops.

detected:
Clearing

Stop the power supply and remove the causes of the detected error.

method:Potential• An abnormality may have occurred in a load.

causes:• Some loads generate overcurrent when the unit starts. When the unit isoperated with phase control, you may be able to improve this problem byincreasing the soft-start time. When the unit is operated with cycle control, checkthat the unit’s rated current is not exceeded during a single cycle.

8.2 Er.02: Temperature Rise Error
Detection

The cooling fin temperature has risen abnormally. (This condition applies only tocondition:models with a rated current of 100 A or higher.)When

The output stops.

detected:
Clearing

Stop the power supply and remove the causes of the detected error.

method:Potential• The temperature inside the distribution panel cabinet (ambient temperature)causes:may have exceeded the unit’s specifications. Use the unit in environments withtemperatures of 50°C or lower.
• The unit’s cooling fan may have slowed down or stopped. Check if it isrotating or covered with dust.

8.3 Er.03: Fuse Blowout
Detection

The fuse has blown out. (This condition applies only to units with a fuse.)condition:
When

The output stops.

detected:
Clearing

Stop the power supply and remove the causes of the detected error.

method:Potential• An abnormality may have occurred in a load.

causes:• Some loads generate overcurrent when the unit starts. When the unit isoperated with phase control, you may be able to improve this problem byincreasing the soft-start time. When the unit is operated with cycle control, checkthat the unit’s rated current is not exceeded during a single cycle.

548.4 Er.07: CPU Error
Detection

An abnormality has occurred in the CPU system.

condition:
When

The output stops.

detected:
Clearing

Stop the power supply and contact us.

method:8.5 Er.08: Memory Error
Detection

An abnormality has occurred in data containing parameter information.

condition:
When

The output stops.

detected:
Clearing

Stop the power supply and contact us.

method:8.6 Er.09: Emergency Stop
Detection

The circuit between GT and PH on the control terminal block has opened.

condition:
When

The output stops.

detected:
Clearing

Short-circuit GT with PH on the control terminal block.

method:8.7 Er.10: Power Supply Voltage Drop
Detection

The control power supply voltage has dropped.

condition:
When

The output stops.

detected:
Clearing

Adjust the control power supply voltage so that it falls within the unit’s

method:specifications.

8.8 Er.11: Instantaneous Voltage Drop
Detection

The control power supply voltage has instantaneously stopped or dropped.

condition:(This error is also temporarily displayed when the power supply is stopped.)When

The output stops.

detected:
Clearing

This error is cleared when the control power supply voltage returns to themethod:normal level.

55

8.9 Er.12: Frequency Error
Detection

An error has occurred in the control power supply frequency.

condition:
When

The output continues.

detected:
Clearing

This error is cleared when the control power supply frequency returns to themethod:range in the unit’s specifications.

8.10

Er.13: Heater Disconnection

Detection

The optional heater disconnection detection function detected a heater

condition:

disconnection.
For details, see “11.2.4 Heater disconnection detection function.”Whendetected:

The output continues.
※

Note that the load voltage may increase, putting a burden on the heaters
if the unit is operated with constant current control or constant power
control.

Clearing

Stop the power supply and replace the disconnected heater.

method:Just stopping operation is not sufficient to clear this error.
You can temporarily clear it by setting [F401: Heater disconnection detection
function].

56

8.11

Er.04, Er.05, Er.06, Er.14: Self-diagnostic Function

The self-diagnostic function outputs warnings for the thyristor’s open/short circuit and theload’s open/short circuit on the basis of internal speculation using values of the current
detected with the unit’s built-in CT, the signal output from the thyristor, and the current andvoltage detected with a conversion board if used. It does not actually check if the thyristor andloads are open or short-circuited. With this mechanism, this function may output false warnings
depending on the load type. You can forcibly clear false warnings by setting [F700: Selfdiagnosis stop] to [0: Suspend self-diagnosis].

Self-diagnosis targets differ according to the unit status.
Conversion board category A: UG-TB3, UG-TB3U, UG-TB3H, UG-TB3HU
Conversion board category B: When no conversion board or a model other than those listed
above is used

Er.05

Er.06

Thyristor open

Conversion board category B

Operation in

Operation

Operation in

Operation

progress

stoppedprogress

stopped–*–Diagnosis
targetThyristor short

Diagnosis

Diagnosis

circuittargettargetEr.04

Load short circuit

Er.14

Load open※

Conversion board category A

Diagnosis–

targetDiagnosis–

targetA load open is detected even when the thyristor is open.

57–
Diagnosis
targetDiagnosis
targetDiagnosis
target––9

UNIT OUTLINE

9.1 External Dimensions

Model

UG1-□025△

UG1-□035△

UG1-□050△

UG1-□075△

UG1-□100△

UG1-□150△

UG1-□250△

UG1-□350△

UG1-□450△

Rated

Cooling

Weightcurrent

method

[kg]

25 A

35 A

50 A

75 A

100 A

150 A

250 A

350 A

450 A

Rated voltage

Self

circuitmounting

terminal

screw

screw

Fuse
mounting
screw

M5

M5

3.0

57

M4

M5

M5

3.0

77

M4

M5

M5

3.5

113

M4

M6

M6

4.0

164

M4

M6

M6

5.0

224

M4

M8

M8

7.5

349

M6

M10

M10

11.0

390

M6

M12

M10

11.0

522

M6

M12

M10

Self
coolingSelf
coolingAircoolingAircoolingAircoolingcoolingsurfaceM4cooling

Air

[W]

Main

43

Self

cooling

value

Panel

3.0

coolingAir

Calorific

Fuse□ = 2: 100 to 254 V△ = Blank: No fuse

□ = 4: 380 to 480 V△ = F: With a fuse58

Screw tightening torqueScrew size

Screw tightening torque
[N•m]

M3

0.5

to

0.8

M4

1.5

to

1.8

M5

2.5

to

3.0

M6

6.4

to

7.4

M8

15.7

to

16.7

M10

23.5

to

26.5

M12

39.2

to

44.2

← Screw on the control terminal block59

9.2 External View
Models with a rated current of 25, 35, or 50 A

Models with a rated current of 75 A

60

Models with a rated current of 100 A

Intakeair

Models with a rated current of 150 A

Intakeair

61Models with a rated current of 250 A

Intakeair

Models with a rated current of 350 or 450 A

Intakeair62

10 MAINTENANCE PARTS
10.1

Fuse
Rated current of the unit

Fuse model

25 A

660GH-050S

35 A

660GH-063S

50 A

660GH-100S

75 A

660GH-125S

100 A

660GH-160S

150 A

660GH-250S

250 A

660GH-350S

350 A

660GH-500S

450 A

660GH-710S

Replacement procedure※

Turn OFF the input power supply of the distribution panel and check that the power supply is OFF.

(1) Loosen the screws at the bottom of the unit and open the front cover.
(2) Remove the fuse mounting screws.
(3) Remove the fuse switch from the fuse.
(4) Remove the fuse.
(5) Attach the fuse switch to a replacement fuse.
(6) Attach the replacement fuse to the unit.
(7) Close the front cover and tighten the screws at the bottom of the unit.

10.2

Cooling Fan
Rated current of the unit

Order code

100 A

A00A1917200

150 A

A00A1917300

250 A

A00A1917400

350 A

A00A1917400

450 A

A00A1917400

Replacement procedure※

Turn OFF the input power supply of the distribution panel and check that the power supply is OFF.

(1) Remove the relay connector of the cooling fan.
(2) Remove the cooling fan harness from the cable clip. (The models with a rated current of
100 A only)(3) Remove the fixing screws and remove the cooling fan.
(4) Attach a replacement cooling fan oriented so its air blows to the unit.
(5) Hold the cooling fan harness with a cable clip so that the harness does not contact themain wires. (The models with a rated current of 100 A only)(6) Connect the relay connector of the cooling fan.
63

11 CONVERSION BOARD (OPTIONAL)
The conversion board is an optional item that enables constant current control, constantvoltage control, constant power control, heater disconnection detection, and other functions.
This item does not come with the unit. Parts that are sold separately are required.

11.1

Before Use
Checking the productRequired optional items differ according to the functions to be used. Check that all thenecessary parts are present.

Pattern

Required optional item*3

A

Not required

B

UG-TB1VC

UG-TB1ADUG-TB1AE

UG-TB4(H)F

UG-TB4GUG-TB3(H)H

UG-TB3IUG-TB3(H)URemarkExternal PT
External CT (+ main circuit CT)*1
External CT (+ main circuit CT)

External CT (+ main circuit CT)

External CT (+ main circuit CT)

External PT*2External PT*1

External PT*2External PT*1

External PT*1: Set [F407: CT selection] to [1: Built-in CT] on the display panel.
*2: The conversion board models with “H” (built-to-order products) require the external CT
and main circuit CT.
64

*3: You must prepare the main circuit CT.

The pattern selected here will be used repeatedly in explanations in the subsequent sections.
Set the conversion board according to the corresponding pattern.
(The pattern selected here is described as the “conversion board pattern” in the subsequent
sections.)

How to install the conversion board
Install the conversion board by following its included installation manual.
※

The conversion board is not designed to be removed frequently. Note that installing andremoving it repeatedly may cause contact failures.

Connection diagrams
The wiring method differs according to the conversion board pattern. The connection diagrams
regarding control terminals I1, D1, and V1 are shown below.
※

The connection of other terminals is common to all models and is therefore omitted. See
the connection explained in “5 EXTERNAL CONNECTIONS OF THE UNIT.”● Connections for patterns A and D● Connections for patterns B, F, and H(The external CT and external PT(Only the external PT is used.)

are not used.)

K

L

I1
D1
V1

UG1

I1
D1
V1

UG1

K

L
▲▲V

3V

0V

0V

Load
Load

External PT

 Connections for pattern C (Only the external CT is used.)

UG1
K

L

I1
D1
V1

Kk

Kk

L l

L l

Load
■■A：5A
Main circuit CT

External CT (optional item)

5A：0.1A Main circuit CT (prepared by user)
External CT65 Connections for patterns E, G, and I (The external CT and external PT are used.)
I1
D1
V1

UG1
K

L
▲▲V

3V

0V

0V

External PT
Kk

Kk

Load
L l

L l

■■A：5A
Main circuit CT

11.2

External CT (optional item)

5A：0.1A
External CT

Main circuit CT (prepared by user)

Functions
Model list

The available functions differ according to the conversion board model.

✓: Equipped with thefunction, –: Not equipped with the function
Model

Detection value display

Feedback control method
Constant

Constant

Constant

current

voltage

power

control

control

control––

UG-TB1A✓UG-TB1V

function

Heater

Disconnection

No control

Current

Voltage

Power

–

✓

○

○

–

–

–

–

✓

◎

○

–

–

–

✓

–

✓

○

●

–

–

UG-TB3

✓

✓

✓

✓

◎

●

◎

–

UG-TB3H

✓

✓

✓

✓

●

●

●

–

UG-TB3U

✓

✓

✓

✓

◎

●

◎

✓

UG-TB3HU

✓

✓

✓

✓

●

●

●

✓

UG-TB4

–

–

✓

✓

–

–

◎

–

UG-TB4H

–

–

✓

✓

–

–

●

–

No conversion

detection

board

The detection value display function shows different values according to the conversion board
model.
○
Current◎●

Voltage○●

Displays the current detected with the built-in CT.
Displays the currents detected with the CT (built-in CT or external CT) andconversion board.
Displays the currents detected with the external CT and conversion board.
Displays the control power supply voltage and the voltage output according
to the output setting.
Displays the voltages detected with the external PT and conversion board.
66

Power◎●―※

Displays the powers detected with the built-in or external CT, external PT,
and conversion board.
Displays the powers detected with the external CT, external PT, andconversion board.
Displays nothing.

The accuracy of ◎ and ● among the detected values may decrease from thespecifications according to the combination of the unit, optional items, and load. When theconversion board is installed or replaced, be sure to adjust detected values. For details, see“11.2.3 Detection value adjustment function”

Feedback control
This function performs feedback control using detected values. Mode can be set by display
panel. The related parameters are shown below. This function affects feedback control
accuracy and detection value display accuracy.
 F400: Feedback control method
The selectable modes differ according to the connected conversion board.
Model

Mode selectable with F400

UG-TB1A

0: No feedback, 1: Constant current control

UG-TB1V

0: No feedback, 2: Constant voltage control

UG-TB3UG-TB3H

0: No feedback, 1: Constant current control

UG-TB3U

2: Constant voltage control, 3: Constant power control

UG-TB3HUUG-TB4UG-TB4H※

0: No feedback, 3: Constant power control

If only [0: No feedback] can be selected on the setting screen, the conversion board
may not be connected correctly. Check if the model is displayed with [F408:
Conversion board model check].

※

This parameter needs to be set again after the conversion board is removed andinstalled again for replacement or other purposes. If you start operation without
setting the mode again, this function may fail to operate correctly.

67 F407: CT selection
When conversion board pattern D, F, or H is selected, set this parameter to [1: Built-in CT].

 Parameter F: Gradient (proportional) signal
The adjustment method differs according to the conversion board pattern and the ratingsof the load, external PT, and main circuit CT.
The following simple terms are used in explanations.
Gradient

Indicates parameter F (gradient [proportional] signal).

signalInput signal

Indicates parameter H (manual [upper limit] signal) or parameter P(temperature control signal), whichever is used.

Measured

Indicates the measured value of the load current, load voltage, or loadload value

power during operation.

Maximum

Indicates the maximum load current, maximum load voltage, or maximum

load

load power of the load to be used.

capacity

The value to be used differs according to the usage condition. See thenext table.

Rated value

Indicates the rated value required for the setting.
The value to be used differs according to the usage condition. See thenext table.

68

Adjustment method
Feedback

Conversion

controlboard

methodpattern

Constant

B, G, H, I

voltage

capacity
Maximum load
voltage
Maximum load

control

voltage

Constant
current

Maximum load

C, G, I

control

Maximum load
current
Maximum load
current

D, H

Maximum load
current
Maximum load
current

versus

=

<

=

<

=

<

Maximum load
Constant
power

voltage
E, G, I

control

Rated value

Adjustment

Rated voltage ofthe external PT
Rated voltage ofthe external PT
Rated current of
the main circuit CT
Rated current of
the main circuit CT
Rated current of
the unit
Rated current of
the unit==

Rated voltage of<※<Rated current of
the main circuit CT

Maximum loadRated voltage of=the external PT

and
=

(1)
Rated current of

current

the unit

Maximum loadRated voltage ofvoltage<ororMaximum load<

current(2)(2)

current

Maximum load(1)

the external PT

or

F, H

(2)

Rated current ofMaximum load

voltage(1)(1)

the main circuit CT

Maximum load(2)

the external PT

current

voltage(1)

Rated voltage ofandMaximum load

methodthe external PT(2)
Rated current of
the unit

For adjustment of constant power control or patterns G and H, if the voltage andcurrent both have a maximum load capacity that is smaller than the rated value, use
the maximum load capacity with the larger difference from the rated value.
69

Adjustment method (1): When the maximum load capacity matches the rated value
Use this function with the maximum gradient signal (100.0%).
Adjustment method (2): When the maximum load capacity is smaller than the rated value* When the maximum load capacity can be output during adjustment
Step 1:Minimize the gradient setting (0.0%) in advance to prevent a measured
load value from exceeding the maximum load capacity at power ON.

Step 2:Adjust the gradient setting to output the maximum load capacity with the
maximum input signal.

Adjustment method (2”): When the maximum load capacity is smaller than the rated value* When the maximum load capacity is not output during adjustment
Step 1:Minimize the gradient setting (0.0%) in advance to prevent a measured
load value from exceeding the maximum load capacity at power ON.

Step 2:

Calculate the setting of the input signal (INmax) using the maximum
allowable output value (OUTmax).
INmax =OUTmax× 100
Rated value

Step 3:

Set the input signal to INmax(%).

Step 4:

Adjust the gradient signal so that the measured load value reaches
OUTmax.

Detection value adjustment function
The accuracy may decrease from the specifications according to the combination of the unit,
optional items, and load. When the conversion board is installed or replaced, be sure to adjust
detected values using this function. This function affects feedback control accuracy anddetection value display accuracy.
Step 1:

Set the feedback control as specified in “11.2.2 Feedback control.”

Step 2:

Continue operation until the output becomes stable.
※

It is recommended to maximize the input signal value to the extent possible.
Set it according to the load specifications.

Step 3:

Select [F40*: ** gain adjustment] on the display panel.
The function code to select differs according to the detected values to be adjusted.
 [F404: Current gain adjustment] for adjusting current detection value
 [F405: Voltage gain adjustment] for adjusting voltage detection value
 [F406: Power gain adjustment] for adjusting power detection value

Step 4:Enter the measured load value on the setting screen.

Step 5:Press the SAVE key. If the entered load value is within the correctable range, it iscorrected.

※

Correction is not performed correctly if [F0: Rated value] has not been set correctly.

※

Correction is not performed correctly for detected values that differ greatly from measured
values. Large differences may be caused by wrong settings. Review this section and thesetting of [F0: Rated value].
70※The detection values that can be adjusted differ according to the conversion board model.
Among the detection value display functions described in "11.2.1 Model list", ◎ and ● areadjustable. 〇 is not subject to adjustment.

Panel operation example: Correction to 50 A using F404
Step 5

Step 4

Step 3

Heater disconnection detection function
Only the UG-TB3U and UG-TB3HU conversion boards are equipped with the heater
disconnection detection function. There are two modes with different specifications.
Standard version
SimpleHighly functional version

UG1

connection

UG1
Built-inCT

diagramExternalCT

Built-inCT

External
CT
External
PT

External
PT

B

A
HeaterHeaterDivide the number of heaters by two
so that A is equal to B or B + 1.
Connect the external CT to measure
the current on the heater A side.
Detection

Monitor the heater resistance via the

Monitor the ratio of the current

methodexternal CT and external PT.

detected with the external CT to that

Disconnection is determined with andetected with the built-in CT. The

amount of change from the initialratio of the external CT to the built-in

resistance.

CT should be 1:2. Disconnection isdetermined with a change from thiscurrent ratio.
71

Heater type

Standard version

Highly functional version

Heaters with a constant resistance

The function can be used for heaters
with a resistance that varies when thetemperature changes.

Heater

25% of the rated current or higher

40% of the rated current or higher

capacity

when the output voltage is 100%

when the output voltage is 100%

Detection

10% of the rated voltage and rated

30% of the rated current or higher

range

current or higher

Number of

Up to 20, the same material and

Up to 10, the same material andheaters

capacity

capacity

Number of

It is possible to detect disconnection

Disconnection of a single heater candisconnecte

when multiple heaters are

be detected normally.

d heaters

disconnected.
※※

The function may fail to detect

The amount of change may

disconnection or the feedback

exceed the detection range

control may fail to operate

depending on the usage

normally when multiple heaters

condition, resulting inare disconnected.

detection failure.

Heater disconnection detection (standard version)(1) The load current and load voltage are obtained via the main circuit CT, external CT,
external PT, and conversion board.
(2) The load current (%) and load voltage (%) in the early phase of operation are memorized.
(3) The resistance when the heater load capacity is set is calculated using the memorized load
current and voltage.
(4) The resistance is calculated periodically during operation using the load current and load
voltage.
(5) When the amount of change in the resistance exceeds the preset heater disconnection
detection amount, the error code is displayed and a signal is output on the external warning
relay specified with [F6: Error output destination selection]. The unit continues operation,
instead of stopping.
(6) For malfunction prevention, the heater disconnection detection is not performed when theload voltage is less than 10% of the rated voltage.
(7) For false detection prevention, the heater disconnection detection is not performed for 5
minutes after the start of operation.

72

Connect the conversion board according to conversion board pattern I specified in “11.1.3
Connection diagrams.” There is no other connection specific to this function. The relatedparameters are shown below.
 F401: Heater disconnection detection function
Select [2: Enable standard version] to enable the standard version function.
When the function needs to be temporarily disabled for test operation or other purposes,
select [0: Disable standard version].
※

The highly functional version described in the next section is also available with thisfunction. Note that the function does not work correctly if the highly functional version
is selected by mistake.

 Parameter U: Heater disconnection amountSet the threshold for the disconnection detection. The threshold needs to be set according
to the number of heaters connected in parallel. Set the threshold with the following table asa reference.
Number ofheaters
connected inparallel

U: Heater
disconnection
amount

1

(50%)

2

50%

U = number of disconnected heaters/number of333%

heaters connected in parallel

4

25%

5

20%

(The table on the left shows parameter U when616%

one heater is disconnected.)

7

14%

8

12%

9

11%

10

10%

11

9%

12

8%

13 or 147%

15 or 166%

17 to 205%73

 oP02: Heater resistance setting[oP02: Heater resistance setting] in OPTION mode of the display panel is used to record theinitial heater resistance. Set it with the following procedure.
Step 1:

Complete the settings specified in the previous section.

Step 2:

Continue operation until the heater temperature becomes stable.
※

Disconnection may not be detected correctly if the following steps are
executed before the heater temperature becomes stable.

Step 3:

Select [oP02: Heater resistance setting] on the display panel.

Step 4:Press the DOWN key on the setting screen.

[SEt] flashes on the 7-segment

LED.
Step 5:Press the SAVE key. If the heater resistance is within the settable range, [ESc]is displayed.
※

The initial value can be set only when it is 25% of the rated voltage
and the rated current or higher. If the value is outside the range, theLED continues to flash while displaying [SEt] even when the SAVE key
is pressed.

Heater disconnection detection (highly functional version)(1) Divide the number of heaters by two so that A is equal to B or B + 1.
(2) The number of heaters connected to the A side and the B side are memorized by the unit.
(3) The load current of the A side is obtained via the main circuit CT, external CT, andconversion board.
(4) The load current of A + B is obtained via the built-in CT.
(5) The current ratio (balance) of the heaters divided into two is obtained using these load
currents.
(6) The current ratio (balance) of the heaters is periodically obtained.
(7) When the current ratio of the heaters deviates from the theoretical current ratio value
calculated from the preset number of connected heaters, the error code is displayed andthe external warning relay signal specified with [F6: Error output destination selection] is
output. The unit continues operation, instead of stopping.
(8) For malfunction prevention, the heater disconnection detection is not performed when theload current of heater A + heater B is less than 10% of the rated current.
(9) For false detection prevention, the heater disconnection detection is not performed for 5
minutes after the start of operation.

74

Notes on this function※

If a transformer is included in the main circuit, the current ratio cannot be detected
correctly and this function cannot be used.

※

If heaters with different degrees of aging are used together, there will be a deviation fromthe theoretical current ratio value, which may result in false detection. Feedback control
accuracy may also be affected.

※

If one each of heaters A and B is disconnected, the disconnection cannot be detected
because the current ratio of the heaters and the theoretical current ratio value match.

To use this function, the heaters, main circuit CT, external CT, and external PT need to beconnected differently from the standard connection. Connect these items according to thefollowing diagram.
I1
D1
V1

UG1
K

L
▲▲V

3V

0V

0V

External PT
Kk

Kk

Heater B
L l

Heater A※■■A：5A
Main circuit CT

L l

5A：0.1A
External CT

Select the main circuit CT by referring to the rated current of the unit. It is not necessary totake into consideration heaters divided into two groups when selecting the main circuit CT.

※

It is recommended to connect at least two heaters to the A side. The feedback control,
which uses the external CT, cannot be performed correctly if all heaters connected to the
A side are disconnected. (The signal continues to be output via the heaters on the B side.)

The related parameters are shown below.
 F401: Heater disconnection detection function
Select [3: Enable highly functional version] to enable the highly functional version function.
When the function needs to be temporarily disabled for test operation or other purposes,
select [1: Disable highly functional version].
※

The standard version described in the previous section is also available with thisfunction. Be sure to set the value to [3: Enable highly functional version] or [1: Disablehighly functional version] when heaters are divided into two groups for the highly
functional version. Failure to do so may cause incorrect feedback control, leading toovercurrent.

75 F402: Heater A countSpecify the number of heaters connected in parallel. The heater A count refers to thenumber of heaters connected to the side to which the main circuit CT is connected, as
shown in the connection diagram.
 F403: Heater B countSpecify the number of heaters connected in parallel. The heater B count refers to thenumber of heaters connected to the side without the main circuit CT, as shown in theconnection diagram.
 Parameter U: Heater disconnection amountSet the threshold for the disconnection detection. The threshold needs to be set according
to the number of heaters connected in parallel. Set the threshold with the following table asa reference.
Number of heaters connected in parallel

U: Heater disconnection amount(total of A and B)
3

16%

4

12%

5

10%

6

8%

7

7%

8

6%

9

5%

10

5%

The above settings are approximate values. The value to set may need to be adjusted
according to the actual usage conditions.
After configuring settings, perform the test operation in the following procedure to checkif detection is performed normally.
Step 1:

Perform operation for at least 5 minutes with the number of parallelconnected heaters used to set parameter U.

Step 2:Check that error code Er.13 is not displayed.
If error code Er.13 is displayed, review the connection and the settings of thenumbers of heaters.

Step 3:After stopping operation and the power supply, remove one heater A unit.
(This simulates heater disconnection.)

Step 4:

Perform operation for at least 5 minutes with the absence of one heater.

Step 5:Check that error code Er.13 is displayed.
If error code Er.13 is not displayed, increase the setting of [Parameter U] by
1% and save the new setting. Repeat steps 4 and 5 until the error code isdisplayed.

Step 6:After completing the test operation, connect the removed heater again.
76

11.3

Characteristics
Constant current control

Specifications
Condition

Accuracy• Power supply voltage fluctuation

Rated voltage ± 10%±1%• LoadConstant

FS• Ambient temperature

Constant• Power supply voltage

Constant±2%• Load fluctuation

10 times the rated loadFS

• Ambient temperature

Constant• Power supply voltage

Constant±2%• LoadConstant

FS• Ambient temperature fluctuation–10°C to +50°C※

For conversion board pattern D, which does not use the external CT, the accuracy is±5% FS under all the above conditions.

Characteristics
Signal current

Outputvoltage

Output current

77Constant voltage control
Specifications
Condition

Accuracy• Power supply voltage fluctuation

Rated voltage ± 10%±1%• LoadConstant

FS• Ambient temperature

Constant• Power supply voltage

Constant±1%• Load fluctuation

10 times the rated loadFS

• Ambient temperature

Constant• Power supply voltage

Constant±2%• LoadConstant

FS• Ambient temperature fluctuation–10°C to +50°C

Characteristics
Signal current

Outputvoltage

Output current

78

Constant power control
The following characteristics apply to UG-TB3, UG-TB3U, and UG-TB4.
Specifications
Condition

Accuracy• Power supply voltage fluctuation

Rated voltage ± 10%±1%• LoadConstant

FS• Ambient temperature

Constant• Power supply voltage

Constant±5%• Load fluctuation

4 times the rated loadFS

• Ambient temperature

Constant• Power supply voltage

Constant±3%• LoadConstant

FS• Ambient temperature fluctuation–10°C to +50°C※

For conversion board patterns F and H, which do not use the external CT, theaccuracy is ±5% FS under all the above conditions.

Characteristics
Load resistance curve
Signal current

Outputvoltage

Output current

79Constant power control (built-to-order products)
The following characteristics apply to UG-TBH3, UG-TBH3U, and UG-TB4H.
Specifications
Condition

Accuracy• Power supply voltage fluctuation

Rated voltage ± 10%±1%• LoadConstant

FS• Ambient temperature

Constant• Power supply voltage

Constant±1%• Load fluctuation

10 times the rated loadFS

• Ambient temperature

Constant• Power supply voltage

Constant±1%• LoadConstant

FS• Ambient temperature fluctuation–10°C to +50°C

Characteristics
Load resistance curve
Signal current

Outputvoltage

Output current

80

11.4

External View

• External CT (optional item)

Wiring terminals
Primary side: M4
Secondary side:
M3• External PT (optional item)• For 210 V and 110 V• For 440 V

Wiring terminal processing: None (Process them according to
your usage conditions.)81

12 MAINTENANCE AND INSPECTION Before maintenance and inspection, be sure to stop the supply of power to the main circuitand control circuit. Note that voltage is applied to the circuits even when operation is
stopped via the ST terminal, panel, or communication.
 When the warning circuit is activated, an error code is displayed on the display panel on thefront surface of the product. Check the error code. Resume operation after removing causes
according to “8 ERROR DETECTION.”
 Note that dust, moisture, overheating, vibration, and other issues may degrade theperformance of the unit or cause it to fail.
 Remove dust periodically using compressed air or other tools to prevent dust fromaccumulating on the unit.

82

13 TROUBLESHOOTING
Symptom
There is no

Item to check
Is an error code displayed?

output.

ActionSee “8 ERRORDETECTION” and remove
the causes of the error.

Is the ST terminal short-circuited with the

Short-circuit them.

PH terminal?
Is the VF2 terminal open?

Short-circuit it with the
VE3 terminal.

Are all the input signals zero?

Increase the setting of at• [P: Temperature control signal]

least one parameter.

• [H: Manual (upper limit) signal]• [L: Lower point (lower limit) signal]
Is [F: Gradient (proportional) signal] zero?

Increase the setting.

Is [F101: Temperature controller type]

Check the setting.

correct?
Is the AT terminal setting correct?

Check the setting.

Does the phase of the main circuit power

Match the phases.

supply match that of the control power
supply?
Abnormal

If constant current control does not work, is

outputthe load open?
If constant power control does not work, are

Check the load.

Correct the polarities.

the PT and CT polarities correct?
Are the conversion board settings correct?

Review the [F4: Conversion
board] setting.

There is no

Is the GT terminal short-circuited with theoutput when

PH terminal?

Short-circuit them.

the
RUN/STOP
key ispressed.
Is [F701: RUN/STOP key lock] ON?

Set it to [0: Unlock].

The output

Is the ST terminal short-circuited with theOpen the circuit between

does not stop

PH terminal?

them.

when theRUN/STOP
key ispressed.
83

SymptomThe detection

Item to check
Are the rated value settings correct?

value display

Action
Review the [F0: Rated
value] setting.

does notmatch themeasuredvalue.
Is the secondary-side rated current of the

Review the [F0: Rated

main circuit CT 5 A?

value] setting in terms of
the secondary-side rated
current of 5 A.

The output

Has the correction been performed for the

Correct the detection value

conversion board?

according to “11.2.3

The correction needs to be performed when

Detection value adjustment

the conversion board is installed or replaced.

function.”

Are the detection lines open?

Check the wiring.

If constant power control is used, are theCheck the polarities.

cannot be
fully
controlled.

external CT, main circuit CT, and external PT
polarities correct?
A THY error

Are the PT and CT detection lines

Check the wiring.

has occurred.

connected?

A load error

Is the PT detection line connected?

Check the wiring.

Is [F702: SAVE key lock] ON?

Set it to [0: Unlock].

Is the unit operating?

Some function settings

has occurred.
The settingscannot bechanged.

cannot be changed during
operation. See the list.
The coolingIs the unit stopped?

The fan is designed to

fan does not

rotate only during

rotate.

operation.
Has dust accumulated on the cooling fan?

Remove dust using
compressed air or othertools.

Has the relay connector been left removed
since replacement?
84

Connect it correctly.

14 UNIT SPECIFICATIONS
Item
Model

Specifications
Without a fuse: UG1-2***
With a fuse: UG1-2***F, UG1-4***F (*** indicates the rated
current.)

Main circuit
Number of phases

SingleRated input voltage

100 V to 254 V, 380 V to 480 V

Power supply±10%

fluctuation range
Rated frequency

50/60 Hz (automatic frequency judgment system)

Frequency fluctuation

Rated frequency ± 5%

range
Rated current

25, 35, 50, 75, 100, 150, 250, 350, 450 A

Control circuitControl power supply

Single phase, 200/220 VAC, 25 VA (50 VA for units with
100 A or higher)

Rated frequency

50/60 Hz

Voltage that180 to 242 VAC

guarantees
performance
Power supply to fan

Shared with the control power supply (units with 100 A or
higher)Control method

Phase control, intermittent cycle control, continuous cycle control* Feedback control is not available with the continuous cycle
control method.

Output voltage

Phase control: 0% to 100% of the main circuit power supply

adjustment range

voltage (effective value)
Cycle control: 0% to 100% of the main circuit power supply
voltage (effective value)* Excluding the amount of voltage drop caused with the thyristor.

Gradient setting range

0% to 100% (for the output)

Lower point setting range

0% to 100% (for the output)

Ambient temperature–10°C to 50°C (humidity: 90%RH or less)

Storage temperature–20°C to 70°C

Load to apply

Phase control: Resistance load, inductive load, transformer
primary control
Cycle control: Resistance load (customized product: transformer
primary-side control)
85

Item

Specifications

Control signal(1) Current signal: 4 to 20 mA (DC) (internal resistance: 250 Ω)(2) Voltage signal: 1 to 5 VDC, 0 to 5 VDC (internal resistance:
10 kΩ)Start/stop method

Soft start/stop method, 0.5 seconds (default value)(Adjustable between 0.0 and 300 seconds)

Cooling method

Self cooling (for units with 75 A or less), air cooling (for units
with 100 A or more)

Input and output

Linearity: ±3% FS (at 10% to 90% output)

characteristics(For the continuous cycle control method, linearity: ±5% FS)(Characteristics of roots of 1.6, 1.8, 2.0, 2.2, 2.5, and 3.0 power
and average characteristics are available with the function
characteristic function.)

Current limitation

Settable between 10% and 110% of the rated current (only forcharacteristics

phase control)

Warning output function

Two contact output systems. The output destination can beswitched.
Contact: normally open (250 VAC, 1 A/30 VDC, 1 A)

Withstand voltage

UG1-2***, UG1-2***F: 2000 VAC/1 min between the main
circuit and groundUG1-4***F: 2500 VAC/1 min between the main circuit andgroundInsulation resistance

20 MΩ or higher (500 VDC)

86

15 OPTIONAL ITEM SPECIFICATIONS
ItemSpecifications

Conversion

Constant current

Power supply

Rated voltage ± 10%±5% FS

board

control

voltage fluctuation

characteristics

Load

10 times the rated load

±5% FS(when the built-in

Ambient–10°C to +50°C±5% FSCT is used)temperature

Constant current

Power supply

Rated voltage ± 10%±1% FS

control

voltage fluctuation

characteristics

Load

10 times the rated load

±2% FS(when theAmbient–10°C to +50°C±2% FS

external CT istemperature

Rated voltage ± 10%±1% FS

used)
Constant voltage

Power supply

control

voltage fluctuation

characteristics

Load

10 times the rated load

±1% FS

Ambient–10°C to +50°C±2% FS

Rated voltage ± 10%±5% FS

temperature
Constant power

Power supply

control

voltage fluctuation

characteristics

Load

10 times the rated load

±5% FS(when the built-in

Ambient–10°C to +50°C±5% FSCT is used)temperature

Constant power

Power supply

Rated voltage ± 10%±1% FS

control

voltage fluctuation

characteristics

Load

4 times the rated load

±5% FS(when theAmbient–10°C to +50°C±3% FS

external CT istemperature

Rated voltage ± 10%±1% FS

used)
Constant power

Power supply

control

voltage fluctuation

characteristics

Load

10 times the rated load

±1% FS(built-to-orderAmbient–10°C to +50°C±1% FS

board)

temperature

87

Item

Specifications

Conversion

HeaterLoad to apply

Heaters with a constant resistanceboard

disconnection

Disconnection

Output voltage and current that aredetection

detectable range

10% of the ratings or higher(standard

Maximum number of20version)parallel-connected
loads

HeaterLoad to apply

Heaters with variable resistancedetection (highly

Disconnection

Output current that is 30% of thefunctional

detectable range

rating or higher

version)Maximum number of10

disconnection

parallel-connected
loads
External

For 110 V

Rated primary input

110 V ± 10%

PT

Rated secondary

3V*

outputFor 210 V

Capacity

0.03 VA

Rated primary input

210 V ± 10%

Rated secondary

3V

outputFor 440 V

Capacity

0.03 VA

Rated primary input

440 V ± 10%

Rated secondary

3V

outputExternal CT

Capacity

0.03 VA

Rated primary input

5A

Rated secondary

0.1 A

outputCapacity※

5 VA

Contact us if the main circuit voltage is not 110 V, 210 V, or 440 V ± 10%.

88

APPENDIX A. PARAMETER LIST
Display
symbolP

H

Name

Temperature
control signal
Manual (upper
limit) signal

Setting range

Increment

Unit

0.0

to 100.0

0.1

%

0.0

to 100.0

0.1%

Lower pointL(lower limit)

Default
value
0.0

0.0

Changeable
duringoperation
✓

✓

0.0
0.0

to 100.0

0.1

%

✓

signalGradient
F(proportional)

100.0
0.0

to 100.0

0.1

%

0.0

to 300.0

0.1

s

to

1

%

✓

signalE
C

Soft-start time
Current limit
amount10110

HeaterUdisconnection

0.5
110

✓
✓

50
5

to

50

1

%

✓

amountd

Delay time

0.0

to

3.0

0.1

s

0.0

✓

t

Interval

1.0

to

3.0

0.1

s

1.0

✓

0

to

7

1

No.

n

Functioncharacteristics

0✗↑(“during operation”... the operation status LED is ON or flashes, i.e. output is generated.)

89

Code

Function name

Setting range

F000

Rated current setting

1

to

F001

Rated voltage setting

0.1

to

F100

F101

F2_P

Waveform control
methodTemperature
controller type

Incre
ment

9999
999.9

0: Phase control

Unit

Default
value

Changeable
duringoperation

1

A

*1

✓

0.1

V

*2

✓

–

–

0

✓

–

–

0

✗

0

✗

0

✗

0

✗

0

✗

1

✗

1

✗

1

✗

1

✗

1

✗

1

✗

1: Intermittent cycle control
2: Continuous cycle control
0: 4 to 20 mA (1 to 5 VDC)
1: 0 to 5 VDC
2: Two-position control

Priority of the0: Control terminal block

temperature

input

controller signal (P)Priority of the
F2_H

1: Panel––upper limit signal(H)
Priority of the

F2_L

2: Communication

lower point signal
(L)

F2_F

F2_E

F2_C

Priority of thegradient signal (F)Priority of the softstart time (E)Priority of the current
limit amount (C)Priority of the heater

F2_U

1: Panel––disconnection
amount (U)

F2_d

F2_t

F2_n

Priority of the delay

2: Communication

time (d)Priority of theinterval (t)Priority of the function
characteristics (n)↑(“during operation”... the operation status LED is ON or flashes, i.e. output is generated.)(*1: Rated current value of unit model.)(*2: Rated voltage value of unit model.)

90

Code

F300

Function name

Setting range

Selection of1

Increment

to

7

1

Unit

Changeable

Default

duringvalue

operation

No.

1

✗

target to change

Default values of function characteristics

0.0% ofsetting
10.0% ofsetting
20.0% ofsetting
30.0% ofsetting
40.0% ofsetting
50.0% ofsetting
60.0% ofsetting
70.0% ofsetting
80.0% ofsetting
90.0% ofsetting100.0% ofsetting

Characteristic

Characteristic

Characteristic

Characteristic

Characteristic

Characteristic

Characteristic

1

2

3

4

5

6

7

0

0

0

0

0

0

0

24

28

32

35

40

46

9

37

41

45

48

53

58

22

47

51

55

58

62

67

37

56

60

63

66

69

74

52

65

68

71

73

76

79

67

73

75

77

79

82

84

80

80

82

84

85

87

89

89

87

88

89

90

91

93

95

94

94

95

95

96

97

98

100

100

100

100

100

100

100

91

Code

Function nameFeedback control
F400

methodIncre

Setting range

ment

Unit

Default
value

Changeable
duringoperation

0: No feedback
1: Constant current
2: Constant voltage

–

–

0

✗

–

–

0

✗

3: Constant power
0: Disable standard version

F401

Heater

1: Disable highly functional

disconnection

versiondetection function

2: Enable standard version
3: Enable highly functionalversion

F402

Heater A count

1

to

5

1

–

2

✗

F403

Heater B count

1

to

5

1

–

1

✗

Current gain

1

to

9999

1

A

–

✓

1

to

999.9

0.1

V

–

✓

1

to

999.9

0.1

kW

–

✓

0: External CT, 1: Built-in

–

–

0

✗

–

–

F404

F405

F406

F407

F408

adjustment
Voltage gain
adjustment
Power gain
adjustment
CT selection
Conversion boardCT(No setting)––model check↑(“during operation”... the operation status LED is ON or flashes, i.e. output is generated.)

CodeFunction name

Setting range

F501

Node address

F502

Transmission rate[9.6], [19.2], [38.4]

Transmission[8n1], [8o1], [8E1],

mode[8n2], [8o2], [8E2]

F503

F507

Transmission

0

0

to

to

latency
92

255

999

Incre
ment
1

1

Unit

–

Default
value

Changeable
duringoperation

1

✗

–

kbps

[9.6]

✗

–

–

[8E1]

✗

ms

0

✗

Code

F601

Function name

Setting range

Er.01: Overcurrent

Incre
ment

Unit

Default
value

Changeable
duringoperation

–

–

1

✗

–

–

1

✗

–

–

1

✗

0: No output

–

–

1

✗

1: Output to 1A-1C

–

–

1

✗

2: Output to HA-HC

–

–

1

✗

3: Output to both

–

–

0

✗

detection
Er.02:

F602

Temperature rise
error

F603

Er.03: Fuse blowout
Er.04: Self-diagnosis

F604

Load short circuit
error

F605

F606

Er.05: Self-diagnosis
Thyristor open
Er.06: Self-diagnosis
Thyristor short circuit

F607

Er.07: CPU error

F608

Er.08: Memory error

–

–

0

✗

F609

Er.09: Emergency stop

–

–

0

✗

–

–

2

✗

–

–

2

✗

–

–

2

✗

–

–

2

✗

–

–

2

✗

–

–

1

✗

–

–

0

✗

–

–

0

✗

F610

F611
F612
F613

Er.10: Power supply
voltage drop
Er.11: Instantaneousvoltage drop
Er.12: Frequency error
Er.13: Heater
disconnection
Er.14: Self-

F614

diagnosis
Load open error

F700

Self-diagnosis stop

F701

RUN/STOP key lock

F702

SAVE key lock

0: Suspend self-diagnosis
1: Enable self-diagnosis
0: Unlock
1: Lock
0: Unlock
1: Lock↑(“during operation”... the operation status LED is ON or flashes, i.e. output is generated.)

93

APPENDIX B. PANEL TRANSITION DIAGRAM

94

APPENDIX C. ERROR CODE LIST
Behavior
CodeFunction nameafter
detection

Er.01

Er.02

Er.03

Er.04

Er.05

Er.06

Er.07

Er.08

Er.09

Er.10

Er.11

Er.12

Er.13

Er.14

Overcurrent detection

RecoverymethodOperation

Power

stops

OFF

Operation

Power

stops

OFF

Operation

Power

stops

OFF

Self-diagnosis: Load

OperationPowershort circuit error

stops

OFF

Self-diagnosis: Thyristor

Operation

Power

open

stops

OFF

Self-diagnosis: Thyristor

OperationPowershort circuit

stops

OFF

CPU error

Operation

Power

stops

OFF

Operation

Power

stops

OFF

Operation

Automatic

stops

recoveryPower supply voltage

Operation

Automatic

drop

stops

recovery

Instantaneous voltage

Operation

Automatic

drop

stops

recoveryFrequency error

Operation

Automatic

continues

recoveryOperation

Automatic

continues

recoverySelf-diagnosis: Load

Operation

Automatic

open error

continues

recoveryTemperature rise error

Fuse blowout

Memory error

Emergency stop

Heater disconnection

Relay
outputError history

destination
Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

Relay (1)

Saved

(None)

Not saved(None)

Not saved(None)

Saved (only during
operation)

Relay (2)

Saved (only during
operation)

Relay (2)Not saved

Relay (2)Not saved

Relay (2)Not saved

Relay (2)Not saved

Relay (1): Between 1A and 1C on the control terminal block, (2) between HA and HC on thecontrol terminal block95

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Contact a representative in charge of power regulators.

This instruction manual is subject to change without notice.