• R4G series
  • R4G series
  • R4G series
  • R4G series
  • R4G series
  • R4G series

R4G series

Compact and High Resolution
Regulated DC Power Supply

Implement ultra low ripple and High Speed response by the series regulator system

  • Max Voltage: 6V to 650V
  • Max Current: 0.1A to 10A
  • Max Power: 12W to 180W
  • Cotrol via CC-Link is available.

Realized Ultra low Noise with Series Regulator System

R4G series is series regulator system high accuracy and ultra low noise DC power supply so that enabled setting and reading out more fine output with a 4 digits indicator and a high resolution D/A and A/D convertor adapted newly. Not only Overvoltage protection but also Overcurrent protection is included as standard equipment, and moreover digital communication function is available. They are applicable to wide range from experiment to automation line.

Features and Benefits

Voltage and/or Current displayed four digits indicator
Voltage or Current is indicated with four digits despite of its compact size. It has been possible to control output in more detailed unit as [0.1 mA] and [1 mV] than ever.
Ultra low Ripple and High Speed Response
High Speed Response with ultra low ripple and low noise by the series regulator system. It is best fit to application that fundamental performance is important as DC power supplies.
Ease of Formation of Automation Line or Measuring System
It is able to configure easily automation line or measuring system by utilizing options for analogue remote control, various status output, digital communication.
Standard Equipment of Various Function
Analogue Remote Control and Multi-set in addition to Overvoltage Protection, Overcurrent Protection and Key Lock are included as standard equipment.
Applicable to Digital Interface also
It is able to built-in digital interface despite of series regulator system. It is not required to buy more expensive communication unit than power supply.
Silent Naturally-cooling System (108 W Model and Smaller)
Operation sound is silent as no cooling fan. It is best fit for usage that its operation sound hinders measuring like as test of fan motor. And it is the safety design so as not to expose the heatsink from the case.


  • Various Research and Development
  • As the Power Supply for System
  • For Aging
  • School Training Aid


Model Maaximum Output Minimum Set. Unit *1 Constant Volt. Characteristic Constant Cur. Characteristic Power consmption (VA)
Output Voltage
Output Current
Input regulation
[mV] *2
Load regulation
[mV] *3
Input regulation
[(mA)] *2
Load regulation
[mA] *3
R4G6-2 6 2 12 1 1 0.5 1 5 1 2 10 30
R4G8-5 8 5 40 1 1 0.5 1 5 1 4 20 90
R4G18-2 18 2 36 10 1 0.5 1 2 1 2 10 90
R4G18-3 3 54 10 1 0.5 1 3 1 2 15 100
R4G18-5 5 90 10 1 0.5 1 5 1.5 4 20 170
R4G18-10 10 180 10 10 1 2 10 3 5 25 300
R4G36-1 36 1 36 10 1 0.5 2 2 1 2 10 90
R4G36-3 3 108 10 1 0.5 2 4 1 2 15 200
R4G36-5 5 180 10 10 1 2 4 3 5 20 300
R4G45-2 45 2 90 10 1 1 4 4 2 2 15 170
R4G45-4 Coming soon*4 4 180 10 1 1 4 4 5 5 20 300
R4G60-1.2 60 1.2 72 10 1 1 4 4 1 2 10 130
R4G80-1 80 1 80 10 1 1 4 4 1 2 10 130
R4G120-0.3 120 0.3 36 100 0.1 1 7 7 1 2 10 100
R4G120-0.6 0.6 72 100 0.1 1 7 7 1 2 10 160
R4G160-0.45 160 0.45 72 100 0.1 2 10 10 1 2 10 160
R4G250-0.3 250 0.3 75 100 0.1 3 15 15 1 1 5 170
R4G360-0.2 360 0.2 72 100 0.1 3 25 25 1 1 5 160
R4G650-0.1 650 0.1 65 100 0.1 8 30 30 1 1 5 140
  1. Values in Local control.It is possible to set move fine values for remote control by digital communication. Go to "Digital Control Function".
  2. For the AC variation ±10%
  3. For the load variation 10% to 100%
  4. The date of delivery is different from other models, so please contact our sales office for the details.


Remote Control

Output Control

Output Control
Vout·Iout Control Voltage R
0 to Max 0 to 10 Vdc approx.
Input Imp. 500 kΩ
0 to 10 Ω approx.

Output Monitor

Output Monitor
0 to Max
0 to about 10 Vdc
Output Imp. 1 kΩ
0 to about 10 Vdc
Output Imp. 1 kΩ

* Output control external signal should not be grounded but floating potential. + output terminal and common become same potential. Power supply cannot be controlledor could be damaged if common is grounded via way of customer's equipment. Please be aware that external control voltage signal could accidentally be connected to the ground of other equipment in case, for example, multi-channel, non-isolated PLC is in use.

Output of Status

Output of Status

COMMON is floating with the output of Open Collector for each COMMON.
Isolation voltage 30 Vdc, Sink Current ≤ 5 mA

  • Power ON: ON at Power ON status
  • OUTPUT: ON at OUTPUT status
  • FLT: ON at abnormal status
    [ON for the status of OVP, OCP and Interlock (LD).]
  • CV, CC: ON at CV or CC status

Remote Switch ON/OFF

Remote Switch ON/OFF
Output Relay Open Collector
ON Short VCE ≤ 0.4 V
OFF Open VCE ≥ 2 V
  • Sink current 1mA
  • Logic of OUTPUT can be made reverse.

Parallel Operation by One Control

Parallel Operation by One Control

One master unit can control several slave units that are parallel connected.
It is possible to increase output current by connecting more than 2 units of the same model power supply in parallel.

Remote Sensing

Remote Sensing

Prevent to degrade stability due to voltage drop (Vo-VL) by resistance (R) in output wiring or contact resistance. (up to 0.5 V)

(Except R4G360-0.2, R4G650-0.1)

Digital Control Function (at selected various optional digital interface)

Control Function Output ON/OFF setting
Display of various Status (Output/Input/OVP/OCP/Door Switch)
Digital Control Max. 32 units
Package Control Multiple Units Hooked
Write Function Setting Output Voltage/Current Percent Mode *1, Voltage or Current Mode *2
Setting OVP/OCP Percent Mode *1, Voltage or Current Mode *2
Read Function Measured Output Voltage/Current Percent Mode *1, Voltage or Current Mode *2
Setting Output Voltage/Current Percent Mode *1, Voltage or Current Mode *2
Setting OVP/OCP Percent Mode *1, Voltage or Current Mode *2
  1. Minimum setting unit for each model is one ten-thousandth (100.00%).
  2. Minimum setting unit for each model is one count of the indicator.


This image is R4G's front panel.
This image is R4G's rear panel.
  1. Indicate output voltage and OVP setting
  2. Indicate output current and OCP setting
  3. Display remote programming: Lighten during remote control of voltage or current.
  4. Display OUTPUT: Lighten during output ON.
  5. ON/OFF Switch, output: This use for output ON/OFF at local and reset of protection functions.
  6. Display LAN: Only for -LMi optional model
  7. + Outout Terminal
  8. GND Terminal
  9. - Output Terminal
  10. Setting Dial for output voltage/OVP
  11. Display Voltage Mode
  12. FINE Switch: Changeover setting digits at setting output voltage/current.
  13. Display Current Mode
  14. Setting Dial for output current/OCP
  15. Preset Switch, output
  16. Setting Switch, OVP/OCP
  17. Setting Switch, Key Lock
  18. ON/OFF Switch, Power
  19. Interface Board: Picture shows ones at optional -LGbmb.
  20. Input Terminal


For details, download the datasheet below.


-LGob: Optical Interface Board *1 *2

  • -LGob: Optical Interface board + Optical cable 2 m
  • -LGob(Fc5): Optical Interface board + Optical cable 5 m
  • -LGob(Fc10): Optical Interface board + Optical cable 10m
  • -LGob (Fc20): Optical Interface board + Optical cable 20 m
  • -LGob (Fc40): Optical Interface board + Optical cable 40 m

Insulation control is made with optical communication.
As perfect insulation is made by optical fiber it is able to forestall miss operation as transient phenomenon caused by surge, dielectric thunder or foreign noise, etc.

It is highly encouraged to select -LGob option for use under following conditions.
  • Environment with much electrical noise. (Example. Motors or coils are used nearby power supply or load)
  • Used in high voltage floating. (250 V and higher)
  • Our power supply and controller (PC or PLC) can not be installed within 2 m.
-LGob Optical Interface Board

-LCk: CC-Link Interface Board *1 *4

CC-Link master unit such as PLC can control power supplies with CC-Link compatible with CC-Link ver1.10, possible to operate as CC-Link device station. One unit occupies 2 stations, maximum 32 units can be controllable. Please refer to CC-Link association web for CC-Link detail.

-LCk CC-Link Interface Board

-LMi: Multi digital interface *1 *4

Digital control by LAN (Ethernet), USB (USBTMC) and RS-485 (Multidrop) is available. (These simultaneous use is impossible. And, RS-485 supports only FULL DUPLEX communications.) This option includes -L (SCPI) option, and attaches IVI driver corresponding to SCPI command. It makes it easy for control program development with various programming languages such as LabView, Visual Basic and C# etc.

-LH: Higher isolation voltage (only for up to 80 V models)

This option make the isolation voltage to be ±500 V-DC, which enable extended capability of series operation.

-LGmb: Digital Interface Board *1 *2

  • -LGmb: Digital Interface board + CO-M cable 2m
  • -LGmb (Mc0.15): Digital Interface board + CO-M cable 0.15m
  • -LGmb (Mc0.5): Digital Interface board + CO-M cable 0.5m

Digital control via LAN (Ethernet), USB, RS-232C, RS-485 and GPIB are possible. And, one control in master-slave operation is enabled. (Ethernet is the registered trademark of Xerox CO., Ltd.)

Please select -LGob, if use them under environment with much electrical noise.

Up to 16 units ban be hooked on Master-slave function. (Same model units are hooked. No adapter is required.)

-LGmb Digital Interface Board

-LUs1: USB Interface Board *1 *2

Digital Control is enabled via USB.
It is possible to hook 1 unit per 1 USB port equipped on a personal computer.
If number of USB ports equipped on the PC to be used is in lacking, use a USB hub. But there is a case that the hub is not operated correctly.

OS for Personal Computers: Microsoft Windows XP/Vista/7/8/10
Both of 32 bits and 64 bits are applicable

Microsoft and Windows are registered brands of Microsoft Corp. in USA and other.

-LRs: RS-232C Interface Board *1 *2

Digital Control is enabled via RS-232C.
It is possible to hook 1 unit per 1 COM port equipped on a personal computer.

-LNcn: -COMMON *3

It changes +COMMON for control and monitor voltage to -COMMON.
Potential of -COMMON is the same one of output terminals.

-LNcn option

-L(120V), -L(200V), -L(220V), -L(240V)

It is applicable to above input voltages other than standard 115Vac.

  1. Either one of these options is selectable.
  2. For the detail function of optical interface, USB interface, RS-232C interface and digital interface, please refer to the datasheet of digital controller CO/USB series.
  3. Only for models of its maximum output voltage 120 V and lower.
  4. Only for models of its maximum output voltage 360 V and lower.

How to Order

Type names should be suffixed by optional codes in alphabetical order. Please notice that the input voltage should be describe in the end of line with case arc.



AC Input Cable


125 V/10 A (included as standard)


250 V/10 A *


250 V/10 A (to be sold separetely)


* -L (200V), -L (220 V), -L(240 V) attached as option


Examples of Applied Operation

R4G can be enhanced in its output voltage or current by hooking the same type of units in series or parallel. And one control parallel operation or digital master-slave with optional -LGmb is possible. Do not connect together COMMON of two and more units because the COMMON of the connector for external input and output control (TB1) is connected to +output (in case of optional -LNcn selected, -output).

Series Operation

Series Operation

Sum total of output voltage is 250 V. Accordingly, ones of exceeding 250 V its output voltage can not operate in series. Output current is one of the smallest power supply.

Parallel Operation

Parallel Operation

Make all setting voltage the same value.
Output current is sum total of one of each unit.
Then, make OVP level of all power supplies the maximum to prevent damage.

Split Operation

Split Operation

+ and – output are possible.


For details, download the datasheet below.


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