RKC INSTRUMENT THV-10 User manual

Single-phase Thyristor Unit
20 A/30 A/45 A
/
60 A/80 A/100 A
THV
-
10
Instruction Manual
IMR02W05-E1
RKC INSTRUMENT INC.
®
*00584294*

All Rights Reserved, Copyright 2020, RKC INSTRUMENT INC.
NOTICE
This manual assumes that the reader has a fundamental knowledge of the principles of electricity,
process control, computer technology and communications.
The figures, diagrams and numeric values used in this manual are only for explanation
purpose.
RKC is not responsible for any damage or injury that is caused as a result of using this
instrument, instrument failure or indirect damage.
RKC is not responsible for any damage and/or injury resulting from the use of instruments
made by imitating this instrument.
Periodic maintenance is required for safe and proper operation of this instrument. Some
components have a limited service life, or characteristics that change over time.
Every effort has been made to ensure accuracy of all information contained herein. RKC makes no
warranty, expressed or implied, with respect to the accuracy of the information. The information in
this manual is subject to change without prior notice.
No portion of this document may be reprinted, modified, copied, transmitted, digitized, stored,
processed or retrieved through any mechanical, electronic, optical or other means without prior
written approval from RKC.
Various symbols are used on the equipment, and they have the following meaning.
: Warning (Instrument display)
This symbol is attached to parts that require care when handling this product in order to protect
the operator. Carefully read the cautions in this manual before using the instrument.
: High temperature caution (Instrument display)
Do not touch the heat radiation fin while the power is turned on or just after the power is
turned off as it may be at high temperatures. If touched, burning may result.
Windows is a trademark of Microsoft Corporation.
Modbus is a registered trademark of Schneider Electric.
Company names and product names used in this manual are the trademarks or registered
trademarks of the respective companies.
Thank you for purchasing this RKC product. In order to achieve maximum
performance and ensure proper operation of the instrument, carefully read all
the instructions in this manual. Please place the manual in a convenient
location for easy reference.

IMR02W05-E1 i-1
Safety Precautions
Pictorial Symbols (safety symbols)
Various pictorial symbols are used in this manual to ensure safe use of the product, to protect
you and other people from harm, and to prevent damage to property. The symbols are
described below.
Be sure you thoroughly understand the meaning of the symbols before reading this manual.
: This mark indicates precautions that must be
taken if there is danger of electric shock, fire,
etc., which could result in loss of life or injury.
: This mark indicates that if these precautions
and operating procedures are not taken,
damage to the instrument may result.
:This mark indicates that all precautions
should be taken for safe usage.
: This mark indicates that all precautions
should be taken to avoid fire.
: This mark indicates that all precautions
should be taken to avoid electric shock.
To prevent injury to persons, damage to the instrument and the equipment, a
suitable external protection device shall be required.
All wiring must be completed before power is turned on to prevent
electric shock, fire or damage to the instrument and the equipment.
This instrument must be used in accordance with the specifications to
prevent fire or damage to the instrument and the equipment.
This instrument is not intended for use in locations subject to flammable
or explosive gases.
Do not touch high-voltage connections such as power supply terminals,
etc. to avoid electric shock.
When the withstand voltage test or each test is performed, please contact RKC
sales office or the agent. If you make a mistake in the test method, the
instrument failure may result.
RKC is not responsible if this instrument is repaired, modified or
disassembled by other than factory-approved personnel.
Malfunction may occur and warranty is void under these conditions.

IMR02W05-E1
i-2
Prevent metal fragments or lead wire scraps from falling inside
instrument case to avoid electric shock, fire or malfunction.
Tighten each terminal screw to the specified torque found in
the manual to avoid electric shock, fire or malfunction.
This product is intended for use with industrial machines, test and measuring equipment.
(It is not designed for use with medical equipment and nuclear energy plant.)
This is a Environment A instrument. In a domestic environment, this instrument may cause
radio interference, in which case the user may be required to take additional measures.
Be sure to provide an appropriate surge control circuit respectively for the following:
- If input/output or signal lines within the building are longer than 30 meters.
- If input/output or signal lines leave the building, regardless the length.
This instrument is designed for installation in an enclosed control panel. All high-voltage
connections such as power supply terminals must be enclosed in the control panel to avoid
electric shock to operating personnel.
All precautions described in this manual should be taken to avoid damage to the instrument
or equipment.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
All wiring must be in accordance with local codes and regulations.
Always use this product at the rated power supply voltage, load current and power frequency.
To prevent instrument damage as a result of failure, protect the power line and the
input/output lines from high currents with a suitable overcurrent protection device with
adequate breaking capacity such as a fuse, circuit breaker, etc.
If this product is used for phase control, higher harmonic noise may be generated. Therefore
in this case, take such measures as separating the power line from the high-voltage line for
load drive.
For proper operation of this instrument, provide adequate ventilation for heat dissipation.
Do not connect wires to unused terminals as this will interfere with proper operation of the
instrument.
Turn off the power supply before cleaning the instrument.
Do not use a volatile solvent such as paint thinner to clean the instrument. Deformation or
discoloration may occur. Use a soft, dry cloth to remove stains from the instrument.
To avoid damage to the instrument display, do not rub with an abrasive material or push the
front panel with a hard object.
When disposing of each part used for this instrument, always follows the procedure for
disposing of industrial wastes stipulated by the respective local community.
For Proper Disposal

IMR02W05-E1 i-3
Symbols
Pictorial Symbols (safety symbols)
: This mark indicates important information on installation, handling
and operating procedures.
: This mark indicates supplemental information on installation,
handling and operating procedures.
: This mark indicates where additional information may be located.
Character Symbols
7-segment character
0 1 2 3 4 5 6 7 8 9
Minus Period
0 1 2 3 4 5 6 7 8 9 - .
A B (b) C c D (d) E F G H I J K
A b C c D E F G H I J K
L M N (n) O (o) P Q R S T t U u
L M n o P Q R S T t U u
V W X Y Z
Degree ／Prime ＊
(Asterisk)
V W X Y Z @ ` Š
8.8.
8.8.
Dim lighting
Bright lighting

IMR02W05-E1
i-4
Document Configuration
There are four manuals pertaining to this product. Please be sure to read all manuals specific
to your application requirements.
The following manuals can be downloaded from the official RKC website:
https://www.rkcinst.co.jp/english/download-center/
Manual Manual
Number Remarks
20 A/30 A/45 A/ 60 A/ 80 A/100 A
THV-10 Installation Manual
IMR02W01-EThis manual is enclosed with instrument.
This manual explains the mounting and wiring.
20 A/30 A/45 A/ 60 A/ 80 A/100 A
THV-10 Quick Operation Manual
IMR02W04-EThis manual is enclosed with instrument.
This manual explains the basic key operation,
mode menu, and data setting.
20 A/30 A/45 A/ 60 A/ 80 A/100 A
THV-10 Instruction Manual
IMR02W05-E1This manual you are reading now.
This manual describes installation, wiring,
operation of each function, and
troubleshooting.
20 A/30 A/45 A/ 60 A/ 80 A/100 A
THV-10 Host Communication
Instruction Manual
IMR02W06-EThis manual explains RKC communication
protocol (ANSI X3.28-1976) and Modbus
relating to communication parameters setting.
Read this manual carefully before operating the instrument. Please place the manual
in a convenient location for easy reference.

IMR02W05-E1 i-5
Contents
Page
NOTICE
Safety Precautions ............................................................................................................................... i-1
Pictorial Symbols (safety symbols).............................................................................................. i-1
WARNING ....................................................................................................................................... i-1
CAUTION ........................................................................................................................................ i-2
For Proper Disposal.............................................................................................................................. i-2
Symbols................................................................................................................................................ i-3
Pictorial Symbols (safety symbols).............................................................................................. i-3
Character Symbols ...................................................................................................................... i-3
Document Configuration....................................................................................................................... i-4
Pictorial table of contents ................................................................................................................... i-12
1. OUTLINE............................................................................1-1
Chapter 1 describes features, package contents, model code, etc.
1.1 Features .......................................................................................................1-2
1.2 Checking the Product ...................................................................................1-4
1.3 Checking the Model Code ............................................................................1-5
1.4 Preparation Before Operation.......................................................................1-8
2. MOUNTING........................................................................2-1
Chapter 2 describes mounting cautions, dimensions and mounting procedures.
2.1 Mounting Environment..................................................................................2-2
2.2 Mounting Cautions........................................................................................2-4
2.3 Outer Dimensions and Mounting Dimensions...............................................2-6
2.4 Mounting Procedures .................................................................................2-11

IMR02W05-E1
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Page
3. WIRING ..............................................................................3-1
Chapter 3 describes wiring cautions and shows examples of wiring.
3.1 Circuit Block Diagram ...................................................................................3-2
3.2 Wiring Cautions ............................................................................................3-3
3.3 Wiring of Main Circuit ...................................................................................3-4
3.4 Wiring of Input Signal ...................................................................................3-7
3.4.1 Wiring method of input signal.......................................................................................... 3-7
3.4.2 Wiring example of the series connection (For current input) .......................................... 3-8
3.4.3 Wiring example of the parallel connection (For voltage input or voltage pulse input) .... 3-9
3.5 Wiring for Input/Output Connector ..............................................................3-10
3.5.1 Input/Output connector pin numbers and details ...........................................................3-10
3.5.2 Wire size used for input/output connector......................................................................3-10
3.5.3 Wiring of external gradient setter .................................................................................. 3-11
3.5.4 Wiring of external manual setter ................................................................................... 3-11
3.5.5 Wiring of contact input (DI)............................................................................................ 3-13
3.5.6 Wiring of input signal transfer (with external gradient setter)........................................ 3-14
3.5.7 Wiring of contact input................................................................................................... 3-15
3.5.8 Wiring of alarm output ................................................................................................... 3-16
3.6 Wiring for Retransmission Output Connector .............................................3-17
3.6.1 Retransmission output connector pin numbers and details .......................................... 3-17
3.6.2 Wire size used for retransmission output connector ..................................................... 3-17
3.6.3 Wiring for retransmission output connector example.................................................... 3-17
3.7 Wiring for Communication Connector.........................................................3-18
3.7.1 Communication connector pin numbers and details ......................................................3-18
3.7.2 Wire size used for communication connector ................................................................
3-18
3.8 Connections for Loader Communication ....................................................3-19
3.9 Wiring Method of UL Certified Fuse Holder ................................................3-21
4. PARTS DESCRIPTION......................................................4-1
Chapter 4 describes names of parts of this instrument.
4.1 Parts Description ..........................................................................................4-2

IMR02W05-E1 i-7
Page
5. MODE SWITCHING AND PARAMETER SWITCHING.....5-1
Chapter 5 describes various mode types, how to switch between them, and how to change the set values.
5.1 Switching the Mode ......................................................................................5-2
5.2 Switching Parameters Within the Same Mode..............................................5-4
5.2.1 Switching the monitor screen (Monitor mode A ) ......................................................... 5-4
5.2.2 Switching the setting screen (Parameter select mode B , setting mode C )............. 5-5
5.2.3 Switching the Setting Screen (Engineering mode D ).................................................. 5-6
5.3 Changing and Registering the Set Value......................................................5-8
5.4 List of Parameter Operations......................................................................5-10
6. PARAMETER LIST............................................................6-1
Chapter 6 describes displays, names and data ranges of each parameter.
6.1 Reading the Table .......................................................................................6-2
6.2 Monitor Mode A .....................................................................................6-3
6.3 Parameter Select Mode B .....................................................................6-4
6.4 Setting Mode C ......................................................................................6-7
6.5 Engineering mode D ..............................................................................6-9
Function block 1 ............................................................................................................... 6-9
Function block 2 ............................................................................................................. 6-10
Function block 3 ............................................................................................................. 6-11
Function block 4 ............................................................................................................. 6-12
Function block 5 ............................................................................................................. 6-13
Function block 6 ............................................................................................................. 6-14
Function block 7 ............................................................................................................. 6-15
Function block 8 ............................................................................................................. 6-15
Function block 9 ............................................................................................................. 6-16
Function block 10 ........................................................................................................... 6-17
7. INPUT FUNCTION .............................................................7-1
Chapter 7 describes input related functions, setting contents and setting procedure.
7.1 Control Input (Auto mode) ............................................................................7-2
7.1.1 Description of function..................................................................................................... 7-2
7.1.2 Setting contents .............................................................................................................. 7-2
7.1.3 Setting procedure............................................................................................................ 7-3


IMR02W05-E1
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Page
7.2 Manual Mode ...............................................................................................7-4
7.2.1 Description of function..................................................................................................... 7-4
7.2.2 Setting contents .............................................................................................................. 7-5
7.2.3 Setting procedure............................................................................................................ 7-7
7.3 Gradient Setting Function ............................................................................7-8
7.3.1 Description of function..................................................................................................... 7-8
7.3.2 Setting contents .............................................................................................................. 7-9
7.3.3 Setting procedure............................................................................................................ 7-9
7.4 Contact Input (DI) ......................................................................................7-10
7.4.1 Description of function................................................................................................... 7-10
7.4.2 Setting contents ............................................................................................................ 7-14
7.4.3 Setting procedure.......................................................................................................... 7-15
8. CONTROL AND OUTPUT FUNCTION .............................8-1
Chapter 8 describes control and output related functions, setting contents and setting procedure.
8.1 Output Limiter High and Low .......................................................................8-2
8.1.1 Description of function..................................................................................................... 8-2
8.1.2 Setting contents .............................................................................................................. 8-3
8.1.3 Setting procedure............................................................................................................ 8-3
8.2 Output Limiter High at Operation Start .........................................................8-4
8.2.1 Description of function..................................................................................................... 8-4
8.2.2 Setting contents .............................................................................................................. 8-5
8.2.3 Setting procedure............................................................................................................ 8-6
8.3 Phase Control/Zero-cross Control ................................................................8-7
8.3.1 Description of function..................................................................................................... 8-7
8.3.2 Setting contents .............................................................................................................. 8-8
8.3.3 Setting procedure............................................................................................................ 8-9
8.4 Output Mode for Phase Control ..................................................................8-10
8.4.1 Description of function................................................................................................... 8-10
8.4.2 Setting contents ............................................................................................................ 8-17
8.4.3 Setting procedure.......................................................................................................... 8-18
8.5 Ramp Function (Soft-Start/Soft-Down Function) ........................................8-19
8.5.1 Description of function................................................................................................... 8-19
8.5.2 Setting contents ............................................................................................................ 8-20
8.5.3 Setting procedure.......................................................................................................... 8-23
8.6 Minimum Output Phase Angle Adjustment Function ..................................8-25
8.6.1 Description of function................................................................................................... 8-25
8.6.2 Setting contents ............................................................................................................ 8-25
8.6.3 Setting procedure.......................................................................................................... 8-26

IMR02W05-E1 i-9
Page
8.7 Retransmission Output (AO).......................................................................8-27
8.7.1 Description of function................................................................................................... 8-27
8.7.2 Setting contents ............................................................................................................ 8-28
8.7.3 Setting procedure.......................................................................................................... 8-29
8.8 Current Limit Function ................................................................................8-30
8.8.1 Description of function................................................................................................... 8-30
8.8.2 Setting contents ............................................................................................................ 8-31
8.8.3 Setting procedure.......................................................................................................... 8-31
8.9 Base-Up Setting Function...........................................................................8-32
8.9.1 Description of function................................................................................................... 8-32
8.9.2 Setting contents ............................................................................................................ 8-32
8.9.3 Setting procedure.......................................................................................................... 8-33
8.10 Protection Function for Control of Primary Side of a Transformer ............8-34
8.10.1 Description of function................................................................................................. 8-34
8.10.2 Setting contents .......................................................................................................... 8-36
8.10.3 Setting procedure........................................................................................................ 8-38
8.11 RUN/STOP Transfer.................................................................................8-40
8.11.1 Description of function................................................................................................. 8-40
8.11.2 Setting contents .......................................................................................................... 8-40
8.11.3 Setting procedure........................................................................................................ 8-41
8.12 SCR Trigger Signal Setting.......................................................................8-42
8.12.1 Description of function................................................................................................. 8-42
8.12.2 Setting contents .......................................................................................................... 8-43
8.12.3 Setting procedure........................................................................................................ 8-43
9. ALARM AND SELF-DIAGNOSIS ......................................9-1
Chapter 9 describes alarm and self-diagnosis related functions, setting contents and setting procedure.
9.1 Heater Break Alarm/Thyristor Break-Down Alarm ........................................9-2
9.1.1 Description of function..................................................................................................... 9-2
9.1.2 Type 1 for phase control (constant resistance type, deviation alarm) ............................ 9-3
9.1.3 Type 2 for phase control (linearity resistor type, absolute value alarm) ......................... 9-6
9.1.4 Type 2 for Zero-cross control (linearity resistor type, absolute value alarm).................. 9-8
9.1.5 Alarm differential gap .................................................................................................... 9-11
9.1.6 Number of alarm determination..................................................................................... 9-11
9.1.7 Setting contents ............................................................................................................ 9-12
9.1.8 Setting example of Heater break alarm/Thyristor break-down alarm ........................... 9-19

IMR02W05-E1
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Page
9.2 Non-linear Resistance Heater Break Alarm................................................9-30
9.2.1 Description of function................................................................................................... 9-30
9.2.2 Setting contents ............................................................................................................ 9-32
9.2.3 Setting example of Non-linear resistance heater break alarm...................................... 9-37
9.2.4 Conversion table for output limiter high value
at the time of automatic detection of knee points ......................................................... 9-47
9.3 Power Frequency Monitoring Function .......................................................9-50
9.3.1 Description of function................................................................................................... 9-50
9.3.2 Display items................................................................................................................. 9-50
9.4 Over Current Alarm Function......................................................................9-51
9.4.1 Description of function................................................................................................... 9-51
9.4.2 Setting contents ............................................................................................................ 9-52
9.4.3 Setting procedure.......................................................................................................... 9-53
9.5 Alarm Output ..............................................................................................9-54
9.5.1 Description of function................................................................................................... 9-54
9.5.2 Setting contents ............................................................................................................ 9-54
9.5.3 Setting procedure.......................................................................................................... 9-57
10. DISPLAYS AND SETTINGS..........................................10-1
Chapter 10 describes display items and functions of the monitor screen, and setting related functions.
10.1 Monitors....................................................................................................10-2
10.1.1 Description of function................................................................................................. 10-2
10.2 Default Display Selection........................................................................10-10
10.2.1 Description of function............................................................................................... 10-10
10.2.2 Setting contents ........................................................................................................ 10-10
10.2.3 Setting procedure...................................................................................................... 10-10
10.3 Display OFF Timer .................................................................................10-11
10.3.1 Description of function............................................................................................... 10-11
10.3.2 Setting contents ........................................................................................................ 10-11
10.3.3 Setting procedure...................................................................................................... 10-11
10.4 Parameter Select Function .....................................................................10-12
10.4.1 Description of function............................................................................................... 10-12
10.4.2 Setting contents ........................................................................................................ 10-18
10.5 Integrated Operating Time......................................................................10-19
10.5.1 Description of function............................................................................................... 10-19
10.5.2 Display items............................................................................................................. 10-19
10.5.3 Checking procedure .................................................................................................. 10-20

IMR02W05-E1 i-11
Page
10.6 ROM Version ..........................................................................................10-21
10.6.1 Description of function............................................................................................... 10-21
10.6.2 Display items............................................................................................................. 10-21
10.6.3 Checking procedure .................................................................................................. 10-22
10.7 Set Data Lock .........................................................................................10-23
10.7.1 Description of function............................................................................................... 10-23
10.7.2 Setting contents ........................................................................................................ 10-26
10.7.3 Setting procedure...................................................................................................... 10-26
11. TROUBLESHOOTING...................................................11-1
Chapter 11 describes Error displays and countermeasures for errors.
11.1 Daily Inspection ........................................................................................11-2
11.2 Error Displays ...........................................................................................11-3
11.3 Troubleshooting........................................................................................11-4
11.4 Replacement of UL Certified Fuse............................................................11-8
11.5 Removal of Terminal Cover (For Main Circuit Terminals).........................11-9
12. SPECIFICATIONS .........................................................12-1
INDEX [Alphabetical Order]................................................ A-1
INDEX [Character Order] .................................................... A-3

IMR02W05-E1
i-12
Pictorial table of contents
It shows the corresponding pages for functions that are mainly related to hardware.
* Choose one of the two. Specify
the required options when placing
the order.
Connector is not supplied when
neither one is specified.
Input/Output
connector
Input/Output Connector
················· P. 3-10
Wiring of External
gradient setter
················· P. 3-11
Wiring of External
manual setter
················· P. 3-11
Wiring of Contact input
(DI)
················· P. 3-13
Wiring of Input signal
transfer
················· P. 3-14
Wiring of Contact input
················· P. 3-15
Wiring of Alarm output
················· P. 3-16
Retransmission output
connector (optional) *
Wiring of Retransmission
connector
·················· P. 3-17
Loader
communication
connector
Connection for Loader
communication
connector
················· P. 3-19
Input terminals
Wiring of Input signal
·················· P. 3-7
Communication
connector (optional) *
Wiring of Communication
connector
·················· P. 3-18
Front keys
Operation and settings
·················· P. 5-2
Power supply terminals
Wiring of Main circuit
·················· P. 3-4
Main circuit terminals
Wiring of Main circuit
·················· P. 3-4

OUTLINE
IMR02W05-E1 1-1
This chapter describes features, package contents, model code, etc.
1.1 Features........................................................................................... 1-2
1.2 Checking the Product....................................................................... 1-4
1.3 Checking the Model Code................................................................ 1-5
1.4 Preparation Before Operation .......................................................... 1-8

1. OUTLINE
1-2 IMR02W05-E1
1.1 Features
This instrument is a single-phase thyristor unit for power supply voltage (load) 100 to 240 V AC. It is
possible to adjust power supplied to heaters, etc. by the signal from the controller or the setting of the setter
(potentiometer) or front keys.
Six types of rated current are available
Power supply voltage 100 to 240 V AC
Rated current 20 A 30 A 45 A 60 A 80 A 100 A
The input signal and set value can be checked on the display unit
The display unit can check the input signal from the controller, phase angle ratio, power frequency, current
value or set value of each parameter, etc.
Front keys or communication can be used for the gradient setting,
manual setting, etc.
In addition to the setting by an ordinary potentiometer setting, it is possible to set values for internal gradient
setting and internal manual mode by the front keys or communication while checking these numeric values
shown on the display unit.
Three types of control can be selected
It is possible to select by the front keys or communication and then use any one of Phase control, Zero-cross
control (continuous), and Zero-cross control (input synchronous type).
Front keys
Internal manual mode,
Internal gradient setting,
A
larm setting, etc.
Alarmer etc.
Thyristor break-down,
Heater break alarm, etc.
Alarm output
A
uto mode
Controller
Retransmission output (AO)
0 to 10 V DC
Load
(Heater etc.)
External gradient setting
External
gradient setter
External
manual setter
External manual mode
Power supply for
instrument
Switch etc.
Contact input
Personal
computer
Loade
r
communication
COM-K2-1
Rating 100 to 240 V AC
Communication
converter
Analog
Voltmeter
Host communication
RS-485
Host computer
A
uto/Manual mode etc.

1. OUTLINE
IMR02W05-E1 1-3
Product with current detector (optional)
For instruments with a current detector, the following functions can be selected when ordering.
Constant current control/Power proportional control
Current limit function
Heater break alarm/Thyristor break-down alarm
Non-linear resistance heater break function
Protection function for control of primary side of a transformer
1 alarm output (optional)
Several different alarms can be assigned. An alarm signal is output when any one of the assigned alarms is abnormal.
Retransmission output (AO) function (optional)
The manipulated output value (phase angle ratio) and monitor value can be output as a voltage continuous output 0 to
10 V DC signal. You can use it by connecting to an analog voltmeter.
Host communication (optional)
You can send and receive data by connecting to a host computer using our dedicated protocol RKC communication or
Modbus protocol.
Loader communication
This instrument is equipped with a loader communication port as standard. This instrument can be linked to a personal
computer for setup.
As for the communication converter, use our communication converter COM-K2-1. To perform setup from a personal
computer, a dedicated communication tool is necessary.
The communication tool “PROTEM2” can be downloaded from the official RKC website.
Maximum connections: 1 unit
Communication converter
COM-K2-1

1. OUTLINE
IMR02W05-E1
1-4
1.2 Checking the Product
Before using this product, check each of the following:
Model code
Check that there are no scratch or breakage in THV-10 external appearance (case, heat radiation fin, front panel,
terminal, etc.)
Check that all of the items delivered are complete (Refer to below)
The accessories attached to product Quantity Remarks
Plug connector for input/output
[Code: THV1P-C01]
1 Bundled with the main unit
Supplied when ordered as an option.
Plug connector for retransmission output
[Code: THV1P-C02]
1 Bundled with the main unit
Supplied when ordered as an option.
Plug connector for communication
[Code: THV1P-C03]
1 Bundled with the main unit
Supplied when ordered as an option.
20 A/30 A/45 A/60 A/80 A/100 A
THV-10 Installation Manual
(IMR02W01-E)
1 Bundled with the main unit
20 A/30 A/45 A/60 A/80 A/100 A
THV-10 Quick Operation Manual
(IMR02W04-E)
1 Bundled with the main unit
20 A/30 A/45 A/60 A/80 A/100 A
THV-10 Instruction Manual
(IMR02W05-E1)
1 This
document
Sold
separately
You can also download it from our website.
Website address:
https://www.rkcinst.co.jp/english/download-
center/
20 A/30 A/45 A/60 A/80 A/100 A
THV-10 Host Communication Instruction Manual
(IMR02W06-E)
1 Sold
separately
Refer to P. 1-6 for the details of optional accessories such as the setter and fuse unit. Make sure that you have
the quantity that you ordered.

1. OUTLINE
IMR02W05-E1 1-5
1.3 Checking the Model Code
Use the following list of codes to check whether the product you have is the one you ordered. Please contact our sales
office or distributor if there is any difference from the desired specifications.
List of specification codes
THV 10 PZ 
 
(1) (2) (3) (4) (5) (6) (7) (8)
Description Specification code
(1) (2) (3) (4) (5) (6) (7) (8)
Power supply for load 100 to 240 V AC 10
Control method Phase control/Zero-cross control
(Switchable: Factory set value is Phase control)
PZ
Rated current
20 A AC 020
30 A AC 030
45 A AC 045
60 A AC 060
80 A AC 080
100 A AC 100
Input signal
Voltage input 0 to 10 V DC 5
Voltage input 1 to 5 V DC 6
Current input 4 to 20 mA DC 8
Voltage pulse input 0/12 V DC V
Heater break alarm
Current limit function
Constant current
control
Protection function for
control of primary side
of a transformer *
Power proportional
control
No function N
With heater break alarm, Current limit function,
Constant current control, Protection function for control
of primary side of a transformer, and Power
proportional control
H
With Non-linear resistance heater break alarm, Current limit
function, Constant current control, Protection function for
control of primary side of a transformer, and Power
proportional control
B
Alarm output No alarm output
N
1 alarm output A
Retransmission
output (AO) or
communication
function
None N
Retransmission output (AO) [Continuous transmission output 0 to 10 V DC]
(With plug connector for retransmission output)
A
Communication (RS-485) [RKC communication]
(With plug connector for communication)
B
Communication (RS-485) [Modbus communication]
(With plug connector for communication)
C
Accessory to the plug
connector for
input/output
None
N
Supplied 1
* When controlling the primary side of a transformer, it is recommended to select a code H or B.

1. OUTLINE
IMR02W05-E1
1-6
Accessories (Codes for ordering separately)
When you order an accessory, please specify it with the following code.
Common accessories
Code Details
THV1P-S01 Setter (potentiometer, knob, and scale plate)
THV1P-C01 Plug connector for input/output
THV1P-C02 Plug connector for retransmission output
THV1P-C03 Plug connector for communication
THVP-V01 Output voltmeter (150 V span) [For phase control]
THVP-V02 Output voltmeter (300 V span) [For phase control]
20 A types
Code UL Standard Details Fuse
rating*
THVP-F21 Not UL
certified
Fuse unit for 20 A (fast-blow fuse and holder [3-circuit types]) 20 A
THVP-F20 Fast-blow fuse for 20 A [3-circuit types] 20 A
THVP-H01 Fuse holder for 20 A/30 A [3-circuit types] 
THVP-F22 Not UL
certified
Fuse unit for 20 A (fast-blow fuse and holder [1 circuit type]) 20 A
THVP-F2A Fast-blow fuse for 20 A [for 1 circuit] 20 A
THVP-H02 Fuse holder for 20 A/30 A/45 A [1 circuit type] 
THVP-F23
UL certified
UL certified fuse unit for 20 A (fast-blow fuse and holder [1 circuit type]) 20 A
THVP-F2B UL certified fast-blow fuse for 20 A [1 circuit type] 20 A
THVP-H04 UL certified fuse holder for 20 A/30 A [1 circuit type] 
* Rating of the fuse.
30 A types
Code UL Standard Details Fuse
rating*
THVP-F31 Not UL
certified
Fuse unit for 30 A (fast-blow fuse and holder [3-circuit types]) 30 A
THVP-F30 Fast-blow fuse for 30 A [3-circuit types] 30 A
THVP-H01 Fuse holder for 20 A/30 A [3-circuit types] 
THVP-F32 Not UL
certified
Fuse unit for 30 A (fast-blow fuse and holder [1 circuit type]) 30 A
THVP-F3A Fast-blow fuse for 30 A [1 circuit type] 30 A
THVP-H02 Fuse holder for 20 A/30 A/45 A [1 circuit type] 
THVP-F33
UL certified
UL certified fuse unit for 30 A (fast-blow fuse and holder [1 circuit type]) 30 A
THVP-F3B UL certified fast-blow fuse for 30 A [1 circuit type] 30 A
THVP-H04 UL certified fuse holder for 20 A/30 A [1 circuit type] 
*Rating of the fuse.
45 A types
Code UL Standard Details Fuse
rating*
THVP-F42 Not UL
certified
Fuse unit for 45 A (fast-blow fuse and holder [1 circuit type]) 50 A
THVP-F45 Fast-blow fuse for 45 A [1 circuit type] 50 A
THVP-H02 Fuse holder for 20 A/30 A/45 A [1 circuit type] 
THVP-F43
UL certified
UL certified fuse unit for 45 A (fast-blow fuse and holder [1 circuit type]) 50 A
THVP-F4B UL certified fast-blow fuse for 45 A [1 circuit type] 50 A
THVP-H05 UL certified fuse holder for 45 A/60 A/80 A/100 A [1 circuit type] 
*Rating of the fuse.