TEXIO PU Series User manual

B71-0128-00
INSTRUCTION MANUAL
750W SERIES DC POWER SUPPLY
PU SERIES
PU6-100 6V/100A PU8-90 8V/90A
PU12.5-60 12.5V/60A PU20-38 20V/38A
PU30-25 30V/25A PU40-19 40V/19A
PU60-12.5 60V/12.5A PU80-9.5 80V/9.5A
PU100-7.5 100V/7.5A PU150-5 150V/5A
PU300-2.5 300V/2.5A PU600-1.3 600V/1.3A

■ About Brands and Trademarks
TEXIO is the product brand in the industrial-use electronics equipment of our company.
The company and product names described in this manual are the brands and trademarks owned by the respective
companies or organizations in each country and region.
■ About the Instruction Manual
Permission from the copyright holder is needed to reprint the contents of this manual, in whole or in part. Be aware
that the product specifications and the contents of this manual are subject to change for the purpose of improvement.

CONTENTS
USING THE PRODUCT SAFELY ............................................................................................ Ⅰ~Ⅲ
1. GENERAL INFORMATION ____________________________________________________ 1
1-1. Features and options........................................................................................................................1
1-2. Analog voltage programming and monitoring ..................................................................................1
1-3. Control via the serial communication port........................................................................................1
1-4. Output connections...........................................................................................................................2
1-5. Cooling and mechanical construction ..............................................................................................2
1-6. Models covered by this manual........................................................................................................2
2. PRIOR TO USE _____________________________________________________________ 3
2-1. Initial inspection ................................................................................................................................3
2-2. Accessories ......................................................................................................................................3
2-3. Installation ........................................................................................................................................3
2-4. Preparation for use...........................................................................................................................3
2-5. Rack mounting..................................................................................................................................4
2-6. Location, mounting and cooling .......................................................................................................4
2-7. AC source requirements...................................................................................................................4
2-8. AC input power connection ..............................................................................................................4
2-8-1. AC input connector ............................................................................................................................... 4
2-8-2. AC input cord......................................................................................................................................... 4
2-8-3. Time to heat beforehand...................................................................................................................... 4
2-9. Turn-on checkout procedure ............................................................................................................5
2-9-1. Prior to operation................................................................................................................................... 5
2-9-2. Constant voltage check........................................................................................................................ 5
2-9-3. Constant current check ........................................................................................................................ 5
2-9-4. OVP check............................................................................................................................................. 6
2-9-5. UVL check ............................................................................................................................................. 6
2-9-6. Foldback check ..................................................................................................................................... 6
2-9-7. Address setting ..................................................................................................................................... 6
2-9-8. Baud rate setting................................................................................................................................... 6
2-10. Connecting the load .......................................................................................................................7
2-10-1. Load wiring .......................................................................................................................................... 7
2-10-2. Current carrying capacity................................................................................................................... 7
2-10-3. Wire termination.................................................................................................................................. 8
2-10-4. Noise and impedance effects ............................................................................................................ 8
2-10-5. Inductive loads .................................................................................................................................... 8
2-10-6. Making the load connections............................................................................................................. 9
2-10-7. Connecting single loads, local sensing (default) ........................................................................... 11
2-10-8. Connecting single loads, remote sensing ...................................................................................... 11

2-10-9. Connecting multiple loads, radial distribution method................................................................... 12
2-10-10. Multiple load connection with distribution terminals .................................................................... 12
2-10-11. Grounding outputs.......................................................................................................................... 12
2-11. Local and remote sensing ............................................................................................................13
2-11-1. Local sensing .................................................................................................................................... 13
2-11-2. Remote sensing................................................................................................................................ 14
2-11-3. J2 sense connector technical information ...................................................................................... 14
3. FRONT AND REAR PANEL CONTROLS AND CONNECTORS ______________________ 15
3-1. Front panel controls and indicators ................................................................................................15
3-2. Rear panel ......................................................................................................................................17
3-3. SW1 setup switch...........................................................................................................................18
3-3-1. SW1 position functions....................................................................................................................... 18
3-3-2. Resetting the SW1 switch.................................................................................................................. 18
3-4. J1 programming and monitoring connector ...................................................................................19
3-4-1. Making J1 connections....................................................................................................................... 19
4. LOCAL OPERATION _______________________________________________________ 21
4-1. Standard operation.........................................................................................................................21
4-1-1. Constant voltage mode ...................................................................................................................... 21
4-1-2. Constant current operation ................................................................................................................ 21
4-1-3. Automatic crossover........................................................................................................................... 21
4-2. Over voltage protection (OVP) .......................................................................................................22
4-2-1. Setting the OVP level ......................................................................................................................... 22
4-2-2. Activated OVP protection indications................................................................................................ 22
4-2-3. Resetting the OVP circuit................................................................................................................... 22
4-3. Under voltage limit (UVL) ...............................................................................................................22
4-3-1. Setting the UVL level .......................................................................................................................... 22
4-4. Foldback protection ........................................................................................................................23
4-4-1. Setting the Foldback protection......................................................................................................... 23
4-4-2. Resetting activated Foldback protection........................................................................................... 23
4-5. Output ON/OFF control ..................................................................................................................23
4-6. Output SHUT-OFF (SO) control via rear panel J1 connector........................................................24
4-7. ENABLE/DISABLE control via rear panel J1 connector ................................................................24
4-8. CV/CC signal..................................................................................................................................25
4-9. PS_OK signal .................................................................................................................................25
4-10. Safe start and auto-restart modes................................................................................................25
4-10-1. Automatic start mode ....................................................................................................................... 25
4-10-2. Safe start mode................................................................................................................................. 25
4-11. Over temperature protection (OTP) .............................................................................................25
4-12. Last setting memory.....................................................................................................................26
4-13. Series operation ...........................................................................................................................26
4-13-1. Series connection for increased output voltage............................................................................. 26
4-13-2. Series connection for positive and negative output voltage ......................................................... 27

4-14. Parallel operation..........................................................................................................................28
4-14-1. Parallel operation (1) ........................................................................................................................ 28
4-14-2. Parallel operation (2) ........................................................................................................................ 29
4-15. Daisy-chain connection ................................................................................................................30
4-16. Front panel locking .......................................................................................................................31
4-16-1. Unlocked front panel......................................................................................................................... 31
4-16-2. Locked front panel ............................................................................................................................ 31
5. REMOTE ANALOG PROGRAMMING___________________________________________ 32
5-1. LOCAL /REMOTE analog control ..................................................................................................32
5-2. LOCAL/REMOTE analog indication ...............................................................................................32
5-3. Remove voltage programming of output voltage and current limit ................................................33
5-4. Resistive programming of output voltage and current ...................................................................34
5-5. Remote monitoring of output voltage and current..........................................................................35
6. RS232 & RS485 REMOTE CONTROL __________________________________________ 36
6-1. CONFIGURATION .........................................................................................................................36
6-1-1. Default setting ..................................................................................................................................... 36
6-1-2. Address setting ................................................................................................................................... 36
6-1-3. RS232 or RS485 selection ................................................................................................................ 36
6-1-4. Baud rate setting................................................................................................................................. 36
6-1-5. Setting the unit into Remote or Local mode..................................................................................... 36
6-1-6. RS232/485 port in Local mode.......................................................................................................... 37
6-1-7. Front panel in Remote mode............................................................................................................. 37
6-2. RS232/485 connector.....................................................................................................................37
6-3. Connecting power supply to RS232 or RS485 bus .......................................................................37
6-3-1. Single power supply ........................................................................................................................... 37
6-3-2. Multi power supply connection to RS232 or RS485 bus ................................................................ 39
6-4. Communication interface protocol..................................................................................................40
6-4-1. Data format.......................................................................................................................................... 40
6-4-2. Addressing........................................................................................................................................... 40
6-4-3. End of Message.................................................................................................................................. 40
6-4-4. Checksum............................................................................................................................................ 40
6-4-5. Acknowledge....................................................................................................................................... 40
6-4-6. Backspace ........................................................................................................................................... 40
6-5. Error messages ..............................................................................................................................41
6-6. Command set description...............................................................................................................41
6-6-1. Command set categories................................................................................................................... 41
6-6-2. Initialization control commands ......................................................................................................... 42
6-6-3. ID control commands.......................................................................................................................... 42
6-6-4. Output control commands.................................................................................................................. 42
6-6-5. Global output commands................................................................................................................... 43
6-6-6. Status control commands .................................................................................................................. 45
6-7. Status, error and SRQ registers.....................................................................................................46

6-7-1. Conditional registers........................................................................................................................... 47
6-7-2. Service Request: Enable and Event Registers................................................................................ 48
6-8. Serial communication test set-up ...................................................................................................49
7. ISOLATED ANALOG PROGRAMMING OPTION __________________________________ 50
7-1. Specifications .................................................................................................................................50
7-1-1. 0V to 5V/0V to 10V option.................................................................................................................. 50
7-1-2. 4mA to 20mA option........................................................................................................................... 50
7-2. Isolated programming and monitoring connector...........................................................................51
7-3. Setup and operating instructions....................................................................................................52
7-3-1. Setting up the power supply for 0V to 5V/0V to 10V Isolated Programming and Monitoring...... 52
7-3-2. Setting up the power supply for 4mA to 20mA Isolated Programming and Monitoring............... 52
8. MAINTENANCE ___________________________________________________________ 53
8-1. Units under warranty ......................................................................................................................53
8-2. Periodic maintenance.....................................................................................................................53
8-3. Fan exchange.................................................................................................................................53
8-4. Parts replacement and repairs .......................................................................................................53
8-5. Fuse rating......................................................................................................................................53
APPENDIX A TROUBLESHOOTING _____________________________________________ 54
APPENDIX B PU 750W POWER SUPPLIES OUTPUT DRAWINGS _____________________ 55
APPENDIX C SPECIFICATIONS ________________________________________________ 56
APPENDIX D ACCESSORIES __________________________________________________ 60

I
USING THE PRODUCT SAFELY
■ Preface
To use the product safely, read instruction manual to the end.
Before using this product, understand how to correctly use it.
If you read the manuals but you do not understand how to use it, ask us or your local dealer.
After you read the manuals, save it so that you can read it anytime as required.
■ Pictorial indication
The manuals and product show the warning and caution items required to safely use the product.
The following pictorial indication and warning character indication are provided.
<Pictorial indication>
Some part of this product or the manuals may show this pictorial indication.
In this case, if the product is incorrectly used in that part, a serious danger may be brought
about on the user's body or the product.
To use the part with this pictorial indication, be sure to refer to the manuals.
If you use the product, ignoring this indication, you may get killed or seriously injured.
This indication shows that the warning item to avoid the danger is provided.
If you incorrectly use the product, ignoring this indication, you may get slightly injured or
the product may be damaged.
This indication shows that the caution item to avoid the danger is provided.
Please be informed that we are not responsible for any damages to the user or to the third person, arising from
malfunctions or other failures due to wrong use of the product or incorrect operation, except such responsibility for
damages as required by law.

II
USING THE PRODUCT SAFELY
■ Do not remove the product's covers and panels
Never remove the product's covers and panels for any purpose.
Otherwise, the user's electric shock or fire may be incurred.
■ Warning on using the product
Warning items given below are to avoid danger to user's body and life and avoid the damage or deterioration of the
product. Use the product, observing the following warning and caution items.
■ Warning items on power supply
● Power supply voltage
The rated power supply voltages of the product are 100, 120, 220 and 240VAC. The rated power supply voltage for
each product should be confirmed by reading the label attached on the back of the product or by the “rated” column
shown in the instruction manual. The specification of power cord attached to the products is rated to 125VAC for
all products which are designed to be used in the areas where commercial power supply voltage is not higher
than 125VAC. Accordingly, you must change the power cord if you want to use the product at the power supply
voltage higher than 125VAC. If you use the product without changing power cord to 250VAC rated one, electric
shock or fire may be caused. When you used the product equipped with power supply voltage switching system,
please refer to the corresponding chapter in the instruction manuals of each product.
● Power cord
(IMPORTANT) The attached power cord set can be used for this device only.
If the attached power cord is damaged, stop using the product and call us or your local dealer.
If the power cord is used without the damage being removed, an electric shock or fire may be caused.
● Protective fuse
If an input protective fuse is blown, the product does not operate. For a product with external fuse holder, the fuse
may be replaced. As for how to replace the fuse, refer to the corresponding chapter in the instruction manual.
If no fuse replacement procedures are indicated, the user is not permitted to replace it. In such case, keep the
case closed and consult us or your local dealer. If the fuse is incorrectly replaced, a fire may occur.
■ Warning item on Grounding
If the product has the GND terminal on the front or rear panel surface, be sure to ground the product to safely use it.
■ Warnings on Installation environment
● Operating temperature and humidity
Use the product within the operating temperature indicated in the “rating” temperature column.
If the product is used with the vents of the product blocked or in high ambient temperatures, a fire may occur.
Use the product within the operating humidity indicated in the “rating” humidity column.
Watch out for condensation by a sharp humidity change such as transfer to a room with a different humidity.
Also, do not operate the product with wet hands. Otherwise, an electric shock or fire may occur.
● Use in gas
Use in and around a place where an inflammable or explosive gas or steam is generated or stored may result in an
explosion and fire. Do not operate the product in such an environment.
Also, use in and around a place where a corrosive gas is generated or spreading causes a serious damage to the
product. Do not operate the product in such an environment.
● Installation place
Do not insert metal and inflammable materials into the product from its vent and spill water on it.
Otherwise, electric shock or fire may occur.

III
USING THE PRODUCT SAFELY
■ Do not let foreign matter in
Do not insert metal and inflammable materials into the product from its vent and spill water on it.
Otherwise, electric shock or fire may occur.
■ Warning item on abnormality while in use
If smoke or fire is generated from the product while in use, stop using the product, turn off the switch, and remove the
power cord plug from the outlet. After confirming that no other devices catch fire, ask us or your local dealer.
■ Input / Output terminals
Maximum input to terminal is specified to prevent the product from being damaged.
Do not supply input, exceeding the specifications that are indicated in the "Rating" column in the instruction manual of
the product. Also, do not supply power to the output terminals from the outside.
Otherwise, a product failure is caused.
■ Calibration
Although the performance and specifications of the product are checked under strict quality control during shipment
from the factory, they may be deviated more or less by deterioration of parts due to their aging or others.
It is recommended to periodically calibrate the product so that it is used with its performance and specifications stable.
For consultation about the product calibration, ask us or your local dealer.
■ Daily Maintenance
When you clean off the dirt of the product covers, panels, and knobs, avoid solvents such as thinner and benzene.
Otherwise, the paint may peel off or resin surface may be affected. To wipe off the covers, panels, and knobs, use a
soft cloth with neutral detergent in it.
During cleaning, be careful that water, detergents, or other foreign matters do not get into the product.
If a liquid or metal gets into the product, an electric shock and fire are caused.
During cleaning, remove the power cord plug from the outlet.
Use the product correctly and safely, observing the above warning and caution items.
Because the instruction manual indicates caution items even in individual items, observe those caution items to correctly
use the product.
If you have questions or comments about the manuals, ask us or E-Mail us.

1
1. GENERAL INFORMATION
This user’s manual contains the operating instructions, installation instructions and specifications of the PU 750W
power supply series. The instructions refer to the standard power supplies, including the built-in RS232/485 serial
communication. For information related to operation with the optional GP-IB programming.
◆ Refer to User Manual for Power Supply GP-IB programming Interface.
PU power supplies are wide output range, high performance switching power supplies. The PU series is power factor
corrected and operates from worldwide AC voltage range continuously. Output voltage and current are continuously
displayed and LED indicators show the complete operating status of the power supply. The Front panel controls
allow the user to set the output parameters, the protection levels (Over-Voltage protection, Under-Voltage limit and
Foldback) and preview the settings. The rear panel includes the necessary connectors to control and monitor the
power supply operation by remote analog signals or by the built-in serial communication (RS232/485). GP-IB
programming and Isolated-Analog programming/monitoring are optional.
1-1. Features and options
- Constant Voltage / Constant Current with automatic crossover.
- Harmonics current control circuit built-in and EN61000-3-2 class A conformity
(Power factor 0.99 [with a built-in active filter]).
- Universal Input Voltage 85-265V AC, continuous operation.
- Embedded Microprocessor Controller.
- Built in RS232/485 Interface.
- Voltage & Current high resolution adjustment by digital encoders.
- High accuracy programming/readback-16 bit.
- Software Calibration (no internal trimmers / potentiometers).
- Last Setting Memory.
- Independent Remote ON/OFF (opt-isolated) and Remote Enable/Disable.
- Parallel operation (Master/Slave) with Active current sharing.
- Remote sensing to compensate for voltage drop of power leads.
- Cooling fan speed control for low noise and extended fan life.
- Zero stacking- no ventilation holes at the top and bottom surface of the power supply.
- Optional GP-IB interface (SCPI compatible).
- Optional Isolated Analog programming/monitoring (0V to 5V or 0V to 10V, user selectable and 4mA to 20mA).
- The PU power supplies series can be configured into a programmable power system of up to 31 units using
the built-in RS232/RS485 communication port in the power supply and the RS485 linking cable provided with each
power supply.
- In a GP-IB system, each power supply can be controlled using the optional GP-IB controller (factory installed).
- PU power supplies of the same output voltage and current rating can be paralleled in master-slave configuration
with automatic current sharing to increase power available.
1-2. Analog voltage programming and monitoring
Analog inputs and outputs are provided at the rear panel for analog control of the power supply. The output voltage
and the current limit can be programmed by analog voltage or by resistor, and can be monitored by analog voltage.
The power supply output can be remotely set to On or Off and analog signals monitor the proper operation of the
power supply and the mode of operation (CV/CC).
1-3. Control via the serial communication port
The following parameters can be programmed via the serial communication port:
1. Output voltage setting.
2. Output current setting.
3. Output voltage measurement.
4. Output current measurement.
5. Output on/off control.
6. Foldback protection setting.
7. Over-voltage protection setting and readback.
8. Under-Voltage limit setting and readback.
9. Power-supply start up mode (last setting or safe mode).

2
1-4. Output connections
Output connections are made to rear panel bus-bars for models up to 60V and to a 4-terminal wire clamp connector for
models above 60V rated output voltage. Either the positive or negative terminal may be grounded or the output may
be floated. Models up to 60VDC Rated Output shall not float outputs more than ±60VDC above/below chassis ground.
Models >60VDC Rated Output shall not float outputs more than ±600VDC above/below chassis ground.
Contact factory for assistance with higher float voltage applications.
Local or remote sense may be used. In remote sense, the voltage drop on the load wires should be minimized.
◆ Refer to "APPENDIX C SPECIFICATIONS". for the maximum voltage drop value.
1-5. Cooling and mechanical construction
The PU series is cooled by internal fans. At the installation, care must be taken to allow free airflow into the power
supply via the front panel and out of the power supply via the rear panel. The PU power supplies have a compact
and lightweight package, which allows easy installation and space saving in the application equipment.
Observe all torque guidelines within this manual. Over torque may damage unit or
accessories. Such damage is not covered under manufacturers warranty.
1-6. Models covered by this manual
Table1-1: Models covered by the manual
Model Voltage range (V) Current range (A) Model Voltage range (V) Current range (A)
PU6-100 0 to 6 0 to 100 PU60-12.5 0 to 60 0 to 12.5
PU8-90 0 to 8 0 to 90 PU80-9.5 0 to 80 0 to 9.5
PU12.5-60 0 to 12.5 0 to 60 PU100-7.5 0 to 100 0 to 7.5
PU20-38 0 to 20 0 to 38 PU150-5 0 to 150 0 to 5
PU30-25 0 to 30 0 to 25 PU300-2.5 0 to 300 0 to 2.5
PU40-19 0 to 40 0 to 19 PU600-1.3 0 to 600 0 to 1.3

3
2. PRIOR TO USE
2-1. Initial inspection
Prior to shipment this power supply was inspected and found free of mechanical or electrical defects. Upon
unpacking of the power supply, inspect for any damage, which may have occurred in transit. The inspection should
confirm that there is no exterior damage to the power supply such as broken knobs or connectors and that the front
panel and meters face are not scratched or cracked. Keep all packing material until the inspection has been
completed. If damage is detected, file a claim with carrier immediately and notify our agent nearest you.
2-2. Accessories
Make sure the accessories are attached correctly. If there are any problems, please contact one of our sales branches.
Accessories vary by model.
◆ Refer to "APPENDIX D ACCESSORIES".
2-3. Installation
This section contains instructions for initial inspection, preparation for use and repackaging for shipment.
Connection to PC, setting the communication port and linking PU power supplies are described in
◆ Refer to "6. RS232 & RS485 REMOTE CONTROL".
PU power supplies generate magnetic fields, which might affect the operation of other instruments.
If your equipment is susceptible to magnetic fields, do not position it adjacent to the power supply.
2-4. Preparation for use
In order to be operational the power supply must be connected to an appropriate AC source. The AC source voltage
should be within the power supply specification.
◆ Do not apply power before reading, "2-7. AC source requirements", "2-8. AC input power connection".
Table 2-1 below, describes the basic setup procedure. Follow the instructions in Table 2-1 in the sequence given to
prepare the power supply for use.
Table 2-1: Basic setup procedure
Step No. Item Description Reference
1 Inspection Initial physical inspection of the power supply 2-1. Initial inspection
2 Installation Installing the power supply,
Ensuring adequate ventilation.
2-5. Rack mounting
2-6. Location, mounting and cooling
3 AC source AC source requirements
Connecting the power supply to the AC source.
2-7. AC source requirements
2-8. AC input power connection
4 Test Turn-on checkout procedure. 2-9. Turn-on checkout procedure
5 Load connection
Wire size selection. Local /Remote sensing.
Single or multiple loads. 2-10-6. Making the load connections
6 Default setting The power supply setting at shipment. 6-1-1. Default setting

4
2-5. Rack mounting
Contact our service center. When Rack Mounting Kit is required.
2-6. Location, mounting and cooling
This power supply is fan cooled. The air intake is at the front panel and the exhaust is at the rear panel.
Upon installation allow cooling air to reach the front panel ventilation inlets. Allow minimum 15cm of unrestricted air
space at the front and the rear of the unit. The power supply should be used in an area that the ambient temperature
does not exceed +50°C.
2-7. AC source requirements
The PU series can be operated from a nominal 100V to 240V, single phase, 47Hz to 63Hz.
◆ The input voltage range and current required for each model is specified in "APPENDIX C SPECIFICATIONS".
◆ Ensure that under heavy load, the AC voltage supplied to the power supply does not fall below the specifications
described in "APPENDIX C SPECIFICATIONS".
2-8. AC input power connection
2-8-1. AC input connector
An IEC connector is provided on the rear panel for connecting the unit to the AC power source with an AC cord.
The IEC connector also provides the safety ground connection while the AC cord is plugged into an appropriate AC
receptacle.
2-8-2. AC input cord
2-8-3. Time to heat beforehand
In order to obtain the performance of regulation of this machine, please carry out aging 30 minutes or more.
Connection of this power supply to an AC power source should be made by an
electrician or other qualified personnel.
There is a potential shock hazard if the power supply chassis (with cover in place) is
not connected to an electrical safety ground via the safety ground in the AC input
connector.
Some components inside the power supply are at AC voltage even when the On/Off
switch is in the “Off” position. To avoid electric shock hazard, disconnect the line
cord and load and wait two minutes before removing cover.
The AC input cord is the disconnect device of the power supply. The plug must be
readily identifiable and accessible to the user. The AC input cord must be no longer
than 3m.

5
2-9. Turn-on checkout procedure
The following procedure ensures that the power supply is operational and may be used as a basic incoming inspection
check. Refer to Fig.3-1 and Fig.3-2 for the location of the controls indicated in the procedure.
2-9-1. Prior to operation
1. Ensure that the power supply is configured to the default setting:
- AC On/Off switch at Off position.
- Dip switch : All positions at Down (”Off”) position.
- Sense connector : Configured to Local Sense as shown in Fig.2-1:
Plug P/N: MC 1.5/5-ST-3.81 (Phoenix)
Fig.2-1: Sense connector default connection
- For units equipped with GP-IB option, ensure that the GP-IB_En switch is in Up (default) position, if checkout is to
be done in GP-IB mode.
2. Connect the unit to an AC source.
3. Connect a DVM with appropriate cables for the rated voltage to the output terminals.
4. Turn the front panel AC power switch to On.
2-9-2. Constant voltage check
1. Turn on the output by pressing OUTPUT pushbutton so the OUTPUT LED illuminates.
2. Observe the power supply VOLT display and rotate the Voltage encoder. Ensure that the output voltage varies
while the VOLT encoder is rotated. The minimum control range is from zero to the maximum rated output for the
power supply model. Compare the DVM reading with the front panel VOLT display to verify the accuracy of the
VOLT display. Ensure that the front panel CV LED is on.
3. Turn off the front panel AC power switch.
2-9-3. Constant current check
1. Ensure that the front panel AC power switch is at Off position and the DVM connected to the output terminals shows
zero voltage.
2. Connect a DC shunt across the output terminals. Ensure that the shunt and the wires' current ratings are higher
than the power supply rating. Connect a DVM to the shunt.
3. Turn the front panel AC power switch to on position.
4. Turn on the output by pressing OUTPUT pushbutton so the OUTPUT LED illuminates.
5. Observe the power supply CURRENT display and rotate the CURRENT encoder. Ensure that the output current
varies while the CURRENT encoder is rotated. The minimum control range is from zero to the maximum rated
output for the power supply model.
6. Compare the DVM reading with the front panel CURRENT display to verify the accuracy of the CURRENT display.
Ensure that the front panel CC LED is on.
7. Turn off the front panel AC power switch.
8. Remove the shunt from the power supply output terminals.
1 Remote (+) sense +S
2 Local (+) sense +LS
3 Not connected
4 Local (-) sense -LS
5 Remote (-) sense -S

6
2-9-4. OVP check
◆ Refer to "4-2. Over voltage protection (OVP)".
1. Turn the front panel AC power switch to On position and turn on the output by pressing OUTPUT pushbutton.
2. Using the VOLT encoder, adjust the output voltage to approx.10% of the unit voltage rating.
3. Momentarily press the OVP/UVL button so that the CURRENT display shows “OUP”.
The VOLTAGE display will show the last setting of the OVP level.
4. Rotate the VOLT encoder CCW to adjust the OVP setting to 50% of the unit voltage rating.
5. Wait a few seconds until the VOLT display returns to show the output voltage.
6. Adjust the output voltage toward it’s maximum and check that the output voltage cannot be increased more than
the OVP setting.
7. Adjust OVP limit to the maximum by repeating step 3 and rotating the VOLT encoder CW.
2-9-5. UVL check
◆ Refer to "5-3. Remove voltage programming of output voltage and current limit".
1. Press the OVP/UVL button TWICE so that the CURRENT display shows "UUL". The VOLTAGE display will
show the last setting of the UVL level.
2. Rotate the VOLT encoder to adjust the UVL level to approx.10% of the unit voltage rating.
3. Wait a few seconds until the VOLT display returns to show the output voltage.
4. Adjust the output voltage toward it’s minimum and check that the output voltage cannot be decreased below the
UVL setting.
5. Adjust the UVL limit to the minimum by repeating step1 and rotating the VOLT encoder CCW.
2-9-6. Foldback check
◆ Refer to "4-4. Foldback protection".
1. Ensure that the output voltage is set to approx. 10% of the unit rating.
2. Adjust the CURRENT encoder to set the current limit to approx. 10% of the unit rating.
3. Momentarily press the FOLD button. Ensure that the FOLD LED illuminates. The output voltage remains
unchanged.
4. Short the output terminals momentarily (approx. 0.5 sec.). Ensure that the output voltage falls to zero, the
VOLT display shows “Fb” and the ALARM LED blinks.
5. Press the FOLD button again to cancel the protection. The output voltage remains zero.
6. Press OUTPUT button. Ensure that the output voltage returns to it’s last setting.
7. Turn the output off by pressing OUTPUT button. Ensure that the VOLT display shows “OFF”.
2-9-7. Address setting
1. Press and hold the RMT／LCL button for approx. 3sec. The VOLT display will show the communication port address.
2. Using the VOLT adjust encoder, check that the address can be set within the range of 0 to 30.
2-9-8. Baud rate setting
1. Press and hold the RMT/LCL button for approx. 3sec. The CURRENT display will show the communication port
Baud Rate.
2. Using The CURRENT adjust encoder, check that the Baud Rate can be set to 1200, 2400, 4800, 9600 and 19200.
Shorting the output may expose the user to hazardous voltages. Observe proper
safety procedures.

7
2-10. Connecting the load
2-10-1. Load wiring
The following considerations should be made to select wiring for connecting the load to the power supply:
- Current carrying capacity of the wire.
◆ Refer to "2-10-2. Current carrying capacity".
- Insulation rating of the wire should be at least equivalent to the maximum output voltage of the power supply.
- Maximum wire length and voltage drop.
◆ Refer to "2-10-2. Current carrying capacity".
- Noise and impedance effects of the load wiring.
◆ Refer to "2-10-4. Noise and impedance effects".
2-10-2. Current carrying capacity
Two factors must be considered when selecting the wire size:
1. Wires should be heavy enough not to overheat while carrying the power supply load current at the rated load, or
the current that would flow in the event the load wires were shorted, whichever is greater.
2. Wire size should be selected to enable voltage drop per lead to be less than 1.0V at the rated current.
Although units will compensate for up to 5V in each load wire, it is recommended to minimize the voltage drop
(1V typical maximum) to prevent excessive output power consumption from the power supply and poor dynamic
response to load changes. Please refer to Tables 2-2 and 2-3 for maximum wire length to limit voltage drop in
American and European dimensions respectively.
Table 2-2: Maximum wire length for 1V drop on lead (in AWG)
Maximum length in meters to limit
voltage drop to 1V or less Wire size AWG
Resistivity
Ω/km 5A 10A 20A 50A 150A
14 8.287 24.4 12.2 6.1 2.4 0.8
12 5.213 36.6 18.3 9.1 3.7 1.2
10 3.2789 61.0 30.5 15.2 6.1 2.0
8 2.0620 97.6 48.8 24.4 9.8 3.3
6 1.2969 152.4 76.2 38.1 15.2 5.1
4 0.8156 243.8 121.9 61.0 24.4 8.1
2 0.5131 365.8 182.9 91.4 41.1 13.7
0 0.3225 609.6 304.8 152.4 61.0 20.3
Table 2-3: Maximum wire length for 1V drop on lead (in meters)
Maximum length in meters to limit
voltage drop to 1V or less
Cross sect. Area
(mm2)
Resistivity
Ω/km 5A 10A 20A 50A 150A
2.5 8.21 24.0 12.0 6.0 2.4 0.8
4 5.09 39.2 18.6 9.8 4.0 1.4
6 3.39 59.0 29.4 14.8 5.8 2.0
10 1.95 102.6 51.2 25.6 10.2 3.4
16 1.24 160.0 80.0 40.0 16.0 5.4
25 0.795 250.0 125.0 62.0 25.2 8.4
35 0.565 354.0 177.0 88.0 35.4 11.8
For currents not shown in Table 3-2 and 3-3, use the formula:
Maximum length=1000/(current x resistivity)
where current is expressed in Amperes and resistivity in ohms/km.
Turn off the AC input power before making or changing any rear panel connection.
Ensure that all connections are securely tightened before applying power. There is a
potential shock hazard when using a power supply with a rated output greater than
40V.

8
2-10-3. Wire termination
The wires should be properly terminated with terminals securely attached. DO NOT use unterminated wires for
load connection at the power supply.
When local sensing, a short from +LS or +S to -V or -S or -LS, will cause damage to the
power supply. Reversing the sense wires might cause damage to the power supply in
local and remote sensing. (Do not connect -S to +V or +S to -V).
2-10-4. Noise and impedance effects
To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted pairs to the
shortest possible length. Shielding of sense leads may be necessary in high noise environments. Where shielding
is used, connect the shield to the chassis via a rear panel Ground screw. Even if noise is not a concern, the load and
remote sense wires should be twisted-pairs to reduce coupling, which might impact the stability of power supply. The
sense leads should be separated from the power leads. Twisting the load wires reduces the parasitic inductance of
the cable which could produce high frequency voltage spikes at the load and the output of power supply, because of
current variation in the load itself. The impedance introduced between the power supply output and the load could
make the ripple and noise at the load worse than the noise at the power supply rear panel output. Additional filtering
with bypass capacitors at the load terminals may be required to bypass the high frequency load current.
2-10-5. Inductive loads
Inductive loads can produce voltage spikes that may be harmful to the power supply. A diode should be connected
across the output. The diode voltage and current rating should be greater than the power supply maximum output
voltage and current rating. Connect the cathode to the positive output and the anode to the negative output of the
power supply. Where positive load transients such as back EMF from a motor may occur, connect a surge suppressor
across the output to protect the power supply. The breakdown voltage rating of the suppressor must be
approximately 10% higher than the maximum output voltage of the power supply.

9
2-10-6. Making the load connections
Ensure that the load wiring mounting hardware does not short the output terminals.
Heavy connecting cables must have some form of strain relief to prevent loosening
the connections or bending the bus-bars.
6V to 60V Models
Refer to Fig.2-2 for connection of the load wires to the power supply bus-bars and to Fig.2-3 for mounting the
bus-bars shield to the chassis.
Fig. 2-2: Load wires connection, 6V to 60V models.
Fig. 2-3: Bus-bars shield mounting
Hazardous voltages exist at the outputs and the load connections when using a power
supply with a rated output greater than 40V. To protect personnel against accidental
contact with hazardous voltages, ensure that the load and its connections have no
accessible live parts. Ensure that the load wiring insulation rating is greater than or
equal to the maximum output voltage of the power supply.
Protect cover
(60 V model only )
Shield cover

10
80V to 600V Models
The 80V to 600V models have a four terminal wire clamp output connector. The two left terminals are the positive
outputs and the other two right terminals are the negative outputs. The connector requirements are as follows:
- Connector type: GIC-2.5/4-G-7.62 (Phoenix).
- Plug type: GIC-2.5/4- ST-7.62 (Phoenix).
- Wires: AWG12 to AWG24.
- Tightening torque: 0.55 to 0.59Nm (5.6 to 6.1kgf・cm).
Follow the below instructions for connection of the load wires to the power supply:
1. Strip approx.10mm at the end of each of the wires.
2. Loosen the mating connector terminal screws.
3. Insert the stripped wires into the terminal and tighten the terminal screw securely (see Fig.2-4).
Positive output (+)
Negative(-)
output/return
Fig.2-4: Load wires connection to the output connector
4. Loosen the chassis screw marked “A” halfway as shown in Fig.2-5.
5. Assemble the protective shield to the chassis and tighten the two screws to fix the shield to the chassis.
Screws tightening torque:0. 50Nm to 0.59Nm (5.1kgf.cm to 6.1kgf・cm).
Fig.2-5: Shield assembly
6. Tighten the wires to one of the shield sides using ty-wrap or equivalent. Refer to Fig.2-6.
Ensure that the wire length inside the shield is long enough to provide strain relief.
Fig.2-6: Protective shield and wires assembly
Hazardous voltages exist at the outputs and the load connections. To protect
personnel against accidental contact with hazardous voltages, ensure that the load and
its connections have no accessible live parts.
Ensure that the load wiring insulation rating is greater than or equal to the maximum
output voltage of the power supply.