TEXIO PAR-A Series User manual

INSTRUCTION MANUAL
REGULATED DC POWER SUPPLY
PAR-A SERIES
PAR18-6A PAR36-3A
OPTIONAL INTERFACE UNITS
FOR PAR-A SERIES
IF-41RS IF-41GU IF-41USB
B71-0038-21

CONTENTS
USING THE PRODUCT SAFELY ........................................................................................................ Ⅰ-Ⅴ
1. PAR-A SERIES...........................................................................................................................1
1-1. About This Manual........................................................................................................................... 1
1-2. Outline of Product............................................................................................................................ 1
1-3. Features........................................................................................................................................... 1
1-3-1. PAR-A power supply unit.......................................................................................................... 1
1-3-2. IF-41RS（Option）...................................................................................................................... 2
1-3-3. IF-41GU（Option）...................................................................................................................... 2
1-3-4. IF-41USB（Option）.................................................................................................................... 2
1-4. Accessories ..................................................................................................................................... 2
2. SPECIFICATIONS......................................................................................................................3
3. INSTRUCTIONS ON USE...........................................................................................................6
3-1. Checking Source Voltage................................................................................................................ 6
3-2. Connecting AC Cable...................................................................................................................... 6
3-3. Precautions for Connecting Output Terminals ................................................................................ 6
3-4. Installation Environments................................................................................................................ 6
4. PANELS .....................................................................................................................................7
4-1. Front Panel...................................................................................................................................... 7
4-2. Rear Panel......................................................................................................................................11
4-3. Bottom Plate.................................................................................................................................. 12
5. GENERAL INSTRUCTIONS.....................................................................................................13
5-1. Turning On Power.......................................................................................................................... 13
5-1-1. Display when power is turned on ........................................................................................... 13
5-1-2. Initial setting when power is turned on................................................................................... 14
5-2. OverheatAlarm (OHA).................................................................................................................. 14
5-3. Changing Source Voltage.............................................................................................................. 15
5-4. Connecting Loads.......................................................................................................................... 16
6. FUNCTIONS AND OPERATION PROCEDURES.....................................................................17
6-1. Basic Operations........................................................................................................................... 17
6-1-1. Set value and output value display ........................................................................................ 17
6-1-2. Voltage setting procedures..................................................................................................... 17
6-1-3. Current setting procedures..................................................................................................... 17
6-1-4. Fine adjustment of voltage (or current).................................................................................. 17
6-2. Output Functions........................................................................................................................... 18
6-2-1. Method of turning on or off the output with the MAIN OUTPUT key...................................... 18
6-2-2. Method of turning on or off the output with the OUTPUT SELECT key................................. 18
6-3. Memory Function........................................................................................................................... 18
6-3-1. Storing preset voltage/current values..................................................................................... 19
6-3-2. Recalling preset values .......................................................................................................... 19
6-3-3. Storing values in preset memory in MAIN OUTPUT key on mode........................................ 19
6-3-4. Copying preset values............................................................................................................ 19
6-3-5. Storing setting of each key..................................................................................................... 20
6-3-6. Initializing setting.................................................................................................................... 20
6-4. Usage of KEYLOCK/LOCAL Key.................................................................................................. 20
6-5. Usage of Remote Sensing Function................................................................................................ 21
6-5-1. Remote sensing terminals...................................................................................................... 21
6-5-2. Remote sensing connection................................................................................................... 21
7. EXTERNAL CONTACT CONTROL..........................................................................................22
7-1. Outline of Functions ...................................................................................................................... 22
7-2. Specifications of External Contact Control Connector.................................................................. 22
7-3. Operation Procedures................................................................................................................... 22
7-3-1. Turning on/off MAIN OUTPUT key through external contacts............................................... 23
7-3-2. Selecting PRESET 1 key to PRESET 4 key through external contacts ................................ 23
7-3-3. Detecting OHA signal ............................................................................................................. 23
7-3-4. Inputting alarm signal through external contacts ................................................................... 23
7-3-5. Inputting several alarms through external contaxts ............................................................... 23

8. REMOTE CONTROL................................................................................................................24
8-1. Connecting IF-41RS...................................................................................................................... 24
8-1-1. Remote control using computer............................................................................................. 25
8-1-2. Master operation..................................................................................................................... 26
8-1-3. Remote control using RT-63................................................................................................... 27
8-1-4. Remote control using GP-620................................................................................................ 28
8-2. Connecting IF-41GU/IF-41USB .................................................................................................... 28
8-2-1. Remote control through GP-IB (IF-41GU only)...................................................................... 29
8-2-2. Control through USB .............................................................................................................. 29
8-2-3. Connecting IF-41GU/IF-41USB local bus.............................................................................. 30
8-3. Setting Addresses.......................................................................................................................... 30
8-3-1. Addresses............................................................................................................................... 30
8-3-2. Setting addresses................................................................................................................... 31
8-3-3. Address setting range and set value...................................................................................... 31
8-4. Transmission and Reception Procedures Using IF-41RS (without using GP-620)...................... 32
8-4-1. Message structure.................................................................................................................. 33
8-4-2. Precautions for sending or receiving message...................................................................... 35
8-4-3. Specifying slave machine as talker from master unit............................................................. 36
8-4-4. Acknowledge or negative acknowledge to slave units........................................................... 36
8-4-5. Message structure list when using IF-41RS........................................................................... 36
8-5. Usage of IF-41GU/IF-41USB........................................................................................................ 38
8-5-1. Usage of GPIB (IF-41GU only)............................................................................................... 38
8-5-2. Usage of USB......................................................................................................................... 38
8-5-3. Status bytes............................................................................................................................ 39
8-5-4. Application configuration ........................................................................................................ 39
8-6. Sending Commands (through GP-IB or USB) .............................................................................. 40
8-6-1. Precautions for sending commands....................................................................................... 40
8-6-2. Selecting unit to be controlled................................................................................................ 40
8-7. Details of Commands.................................................................................................................... 41
8-7-1. Setting unit to be controlled.................................................................................................... 41
8-7-2. Setting voltage or current....................................................................................................... 41
8-7-3. Turning on/off MAIN OUTPUT key......................................................................................... 42
8-7-4. Turning on/off OUTPUT SELECT key.................................................................................... 42
8-7-5. Selecting preset memory........................................................................................................ 42
8-7-6. Status output request ............................................................................................................. 42
8-7-7. ID output request.................................................................................................................... 43
8-7-8. Local setting............................................................................................................................ 43
8-7-9. Local lockout........................................................................................................................... 43
8-7-10. Disabling or enabling service request.................................................................................. 43
8-7-11. Storing set data..................................................................................................................... 44
8-7-12. Checking controlled unit....................................................................................................... 44
8-7-13. Checking connected slave unit............................................................................................. 44
8-7-14. Inquiry about optional board ID............................................................................................ 44
8-7-15. Sending output voltage, output current or operation mode (Response to the ST0 command). 45
8-7-16. Sending all preset values (Response to the ST1 command)............................................... 46
8-7-17. Sending all equipment statuses (Response to the ST2 command)..................................... 46
8-7-18. Sending ID data (Response to the ST3 command)............................................................. 46
8-7-19. Sending output voltage, output current or operation mode (Response to the ST4 command). 46
8-7-20. Sending all preset values (Response to the ST5 command)............................................... 46
8-7-21. Sending power supply data (Response to the PWID command) ........................................ 47
8-7-22. Sending address of controlled unit (IF-41GU/IF-41USB only)............................................. 47
8-7-23. Sending addresses of all connected slave units (IF-41GU/IF-41USB only)........................ 47
8-7-24. Sending optional board ID (IF-41GU/IF-41USB only).......................................................... 47
8-7-25. Information of constant-voltage/constant-current mode ...................................................... 47
8-7-26. Information of alarm status................................................................................................... 48
8-7-27. Information about completion of storing the set data........................................................... 48
8-8. Command List ............................................................................................................................... 49
9. OPERATION FAILURES ..........................................................................................................50
10. OUTSIDE DEMENSIONS.......................................................................................................51

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

II
USING THE PRODUCT SAFELY
WARNING
■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 a fire may be incurred.
■Warning on using the product
The warning items given below are to avoid danger to the user's body and life and avoid the
damage and deterioration of the product.
Use the product, observing the following warning and caution items.
■Warning about Input Power
・Be sure to use the product within the source voltage rating marked on the product. Disobedience
to this warning may result in a fire. The rated source voltage of this product is AV 100V to 240V
(voltage fluctuation: within ±10%), single-phase. (AC250V max.)
・Use the AC power cable supplied with the product. Using another power cable may result in
electric shocks, electrocution or a fire. If the supplied AC power cable is damaged, stop using it
and contact your dealer or our distributor. Using the product with the damaged AC power cable
may result in electric shocks, electrocution or a fire.
・The product will not run if the input protection fuse has blown. The protection fuse is built in the
product and cannot be replaced by the user. If it has blown, contact your dealer or our distributor
without opening the case. Our serviceman will replace it. The user must not attempt to replace the
fuse at his/her discretion. Disobedience to this warning may result in electric shocks, electrocution
or a fire. IF 100V or 120V is to be changed into 220V or 230V, power cord need to be changed.
■About Grounding
・Be sure to connect the ground wire of the three-wire power cable supplied with the product (or the
ground terminal of the three-pole plug of the cable) to the earth. The chassis of the product is
grounded to the GND.

III
USING THE PRODUCT SAFELY
WARNING
■Warning about Installation Conditions
・Use the product in the operation temperature range shown in the manual. Do not use the product
with the vent holes blocked or in a high ambient temperature. Disobedience to this warning may
result in a fire.
・Use the product in the operation humidity range shown in the manual. When moving it to a room
at different humidity, pay attention to dew condensation due to rapid humidity change. Do not
handle the product with wet hands. Disobedience to this warning may result in electric shocks,
electrocution or a fire.
・Do not use the product in or around a place where combustible gas, explosive gas or vapor is
produced or stored. Disobedience to this warning may result in explosion or a fire. Do not use the
product in or around a place where corrosive gas is produced or accumulated. Disobedience to
this warning may result in serious damages to the product.
・Do not put metallic or combustible objects or pour water into the product through the vent holes,
etc. Disobedience to this warning may result in electric shocks, electrocution or a fire.
■Warning about Errors in Operation
・If the product products smoke, fire or odor in operation, stop using the product, turn it off, and
disconnect the AC power cable from the AC outlet. Make sure that the fire hasn’t spread to other
equipment, then contact your dealer or our distributor

IV
USING THE PRODUCT SAFELY
CAUTION
■Caution about Installation Condition
・If this product is used in a place with much electrical noises, it may malfunction. Be sure to ground this
productusing the GND terminalof the 3-core powercable or the GND leadwire of a 3P-2P conversion
plug,if used, when it is necessary to use this productin a place with muchelectrical noises.
■External Control I/O Connector
・The external control I/O connector has its maximum rating. The maximum rating must not be
exceeded. Input or output over the maximum rating may result in damages to the product.
■Before Long-Term Unemployment
・If the product is to be unused for a long period of time, disconnect the AC power cable from
the AC outlet.
■Calibration
・The product has been inspected under strict quality control before shipment. It is, however,
subject to change in the performances due to aged deterioration of parts. To maintain its
performances for long, we recommend that it should be calibrated periodically. For calibration,
please contact your dealer or our distributor.
■Daily Maintenance
・Do not use thinner, benzine or other solvents to clean the case, panels, knobs, etc. of the
product. Such solvent may separate the coating or deteriorate the resin surface.
・Clean the case, panels, knobs, etc. lightly with soft cloth moistened with neutral detergent.
・Before cleaning the product, disconnect the power plug from the AC outlet. Be careful not
to put water, detergent or other foreign matters into the product.

V
USING THE PRODUCT SAFELY
CAUTION
■Input/output terminal
Maximum input to the input terminals is specified to prevent the product from being damaged.
Do not supply input, exceeding the specifications that are indicated in the "Rating" or "Caution on
use" column in the user's guide of the product. Otherwise, a product failure is caused.
Also, do not supply power to the output terminals from the outside.
Otherwise, a product failure is caused.
■When the product is left unused for a long time
Be sure to remove the power plug from the outlet.
(Calibration)
Although the performance and specifications of the product are checked under strict quality control
during shipment from the factory, they may slightly change because of secular changes in its parts.
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, call the dealer or the
company or each sales office where you bought the product.
(Daily maintenance)
When you clean off the dirt of the product covers, panels, and knobs, avoid solvents such as
thinner and benzene. Otherwise, paint may peel off or the resin surface may be affected.
To wipe off the covers, panels, and knobs, use a soft cloth with neutral detergent in it.
During cleaning, be careful that water, detergents, and 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 user's guide indicates caution items even in individual items, observe those caution
items to correctly use the product.
If you have questions or comments about the content of the user's guide, call the company's sales
office.

1
1. PAR-A SERIES
1-1. About This Manual
This manual applies to the following PAR-A series power supply units and optional interface units.
・PAR18-6A,PAR36-3A
Optional interface units for the PAR-A series:
・IF-41RS,IF-41GU,IF-41USB
"YB" models with built-in factory options
1-2. Outline of Product
The PAR-A series are dropper type multi-output DC stabilized power supply units. With the
tracking, delay and four-point preset functions, each unit has a wide variety of applications. The
optional interface boards IF-41GU, IF-41RS and IF-41USB are built in the PAR-A series and
interface with computers. Each PAR-A series power supply unit connected with a computer is
connectable with another PAR-A series power supply unit through the local bus, allowing
construction of an intelligent power supply system. It is possible to control all power supply units in
the system and read back the current and voltage values from the computer.
1-3. Features
1-3-1. PAR-A power supply unit
・With a CPU and four preset memory units, the PAR-A power supply unit may store preset voltage
and current of each channel. This function enables easy switching of the voltage (or current).
・The output voltage and current are displayed on seven-segment, four-digit red LED indicators.
Fine adjustment functions are provided for accurate setting.
・It is possible to select PRESET 1 to PRESET 4, turn on or off MAIN OUTPUT key, detect an OHA
alarm and input an alarm through the external contacts.
・The YB option is available. This factory option lowers the output voltage quickly when output is
turned off with no load or light load. "YB" is added to the product code of a model with this option.
(Example: PW18-6AYB)
・The PAR-A power supply unit has a remote sensing terminal. The remote sensing function
compensates for voltage drop of wires.

2
1-3-2. IF-41RS（Option）
・The PAR-A power supply unit with a built-in IF-41RS is possible to remote-control when it is
connected with a computer by RS-232C. The computer controlling the PAR-A power supply unit
is called the master unit, and the controlled PAR-A power supply unit is called the slave unit. It is
possible to connect a maximum of four slave units, which are connected with one another with
modular cables.
・It is also possible to specify equipment other than a computer as the master unit. If the PAR-A
power supply unit is specified as the master unit, operating the master unit causes the other four
PAR-A power supply units to execute the same operation. (Master operation)
・It is also possible to specify the GP-620 (our GP-IB adapter) or RT-63 (our remote controller) as
the master unit, which may remote-control the PAR-A power supply unit.
・The PAR-A power supply unit is compatible with the PAR-A series (our power supply unit). It is
possible to construct a system containing PWR series power supply unit(s).
1-3-3. IF-41GU（Option）
・The IF-41GU is an optional board, which features higher transmission rate than the IF-41RS and
may control more power supply units simultaneously.
・It is connected with a computer through GP-IB or USB. A maximum of fourteen or thirty-two
units
may be connected directly with a computer through GP-IB or USB, respectively.
・It is also possible to construct a large-scale system if thirty-one PAR-A power supply units are
connected with a PAR-A power supply unit directly connected with a computer using two sets of
twisted pair cables and these units are remote-controlled.
1-3-4. IF-41USB（Option）
・The IF-41USB is an option board with the USB connector and local bus, which have the same
functions of those of the IF-41GU.
・It allows the user to construct a system at lower cost than using the IF-41GU.
1-4. Accessories
＜PAR-A power supply unit＞
AC power cable×1、
CD-ROM（Instruction manual）×1、
Lead wires with connectors for external contact control×1
＜IF-41RS,IF-41GU and IF-41USB＞
Simple manual×1
Lead wire with Y terminal for FG connection×1
FG –control line connector×1

3
2. SPECIFICATIONS
Specifivvations of PAR-A
Item
PAR18-6A
PAR36-3A
Output voltage
0V to 18V
0V to 36V
Voltage setting resolution
10mV
Voltage setting accuracy
±（0.5%SET＋20mV）
23℃±5℃、after 30-minute aging
Output current
0A to 6A
0A to 3A
Current setting resolution
1mA
Current setting accuracy
±（1%SET＋5mA）
23℃±5℃、after 30-minute aging
CV characteristics
Input variation
1mV
（For ±10% variation of source voltage）
Load variation
2mV
（for 0% to 100% variation）
Ripple noise
0.5mV
Measured in the RMS method using 5Hz to 1MHz signals
Transient response (TYP)
50μs
Temperature coefficient
60ppm/℃：(at rated output voltage)
CC characteristics
Input variation
2mA
（For ±10% variation of source voltage）
Load variation
5mA
（For 0% to 100% variation）
Ripple noise
1.5mA
Measured in the RMS method using 5Hz to 1MHz signals
Temperature Coefficient
150ppm/℃：(at rated output current)
Voltage & current indication
Voltage indicator
4-digit red LEDs, lowest digit: 1mV
Voltage indication
accuracy & resolution
±（0.5%rdg＋20mV）/10mV
23℃±5℃、after 30-minute aging
Current indicator
4-digit red LEDs, lowest digit: 1mA
Current indication
accuracy & resolution
±（1%rdg＋5mA）/1mA
23℃±5℃、after 30-minute aging
Voltage & current
Indication range
-2.5%FS to＋102.5%FS/0%FS to＋102.5%FS
Power consumption
source voltage
AC100V
AC115V
AC120V
AC200V
AC220V
AC230V
PAR18-6A
Approx.
213W/
278VA
Approx.
213W/
278VA
Approx.
223W/
285VA
Approx.
213W/
278VA
Approx.
234W/
305VA
Approx.
213W/
278VA
PAR36-3A
Approx.
189W/
255VA
Approx.
189W/
255VA
Approx.
193W/
265VA
Approx.
189W/
255VA
Approx.
208W/
280VA
Approx.
189W/
255VA

4
Common Specifications of PAR-A
Item
Rating
Functions
Described in PANELS and FUNCTIONS AND
OPERATION PROCEDURES.
Grounding
Positive, COM or negative grounding is possible.
Protection
MAIN OUTPUT key is turned off if exhaust air temperature
becomes too high.
Heat radiation
Described in PANELS and FUNCTIONS AND
OPERATION PROCEDURES.
Input voltage
AC100V, 115V, 200V and 230V, 50Hz/60Hz selectable.
Voltage fluctuation: ±10%
Operating temperature
range
0℃to 40℃
Operating humidity range
30%RH to 85%RH (No dew condensation)
Storage temperature
range
-20℃to 60℃
Storage humidity range
20%RH to 85%RH (No dew condensation)
Dielectric strength voltage
Primary - casing: AC1500V for 1 minute
Primary - secondary:AC1500V for 1 minute
Insulation resistance
Primary - casing & primary - secondary: 10MΩor more at DC500V
Secondary - casing: 5MΩor more at DC250V
To-earth voltage
±DC250V
Frame dimensions [mm]
138（W）×124（H）×380（D）
Max. dimensions [mm]
140（W）×147.9（H）×402.9（D）
Weight
Approx.9.1kg
Accessories
AC power cable×1, Instruction manual×1, Lead wires with
connectors for external contact control×1
Specifications of YB Option
Item
Rating
Output voltage fall time
(90% of rated voltage →10%)
100ms or less
Residual voltage
40mV or less
Specifications of remote sensing terminal
Item
Rating
Compensating voltage
range
1V, one way
※The CV characteristics and voltage display specifications show the values at the sensing end.
The transient characteristics are the specifications when the sensing function is not used.

5
Communication Specifications of IF-41RS
<Local bus (PW bus)> (IN/OUT pin 3 of connector J1)
Data transmission rate
9600 bps, error: 5% or less
Data code structure
Start bit
1 [bit]
Data bit
7 [bit]
Parity bit
1 [bit]
Stop bit
1 [bit]
Parity
Even parity
Max. cable length
1.5[m]
Signal type
Single-flow NRZ
0：5[V]
1：0[V]
Connectable units
4 units
<Local bus> (IN pins 2 & 5 of connector J1, connector J2)
Electrical level
Conforms to RS-232C.
Data transmission rate
9600 bps, error: 5% or less
Data code structure
Start bit
1[bit]
Data bit
7[bit]
Parity bit
1[bit]
Stop bit
1[bit]
Parity
Even parity
Max. cable length
10 [m] (between computer & IF-41RS)
Other specifications are the same as those of the local bus (PW bus).
Communication Specifications of IF-41GU (GP-IB Block)
GP-IB
Electrical specifications
Conforms to IEEE488-1978.
Mechanical specifications
Conforms to IEEE488-1978.
Interface functions
SH1, AH1, T6, TE0, L3, LE0, SR1, RL1, PP0, DC0, DT0, C0
Address setting
Possible to set address between 0 and 30 and listen-only mode
when turning on power.
Send delimiters
CR・LF + EOI
Listener functions
Possible to set all output conditions of units under control.
Talker functions
Possible to detect all output and setting conditions of units under
control.
Service request functions
Informs of change in CC/CV status, occurrence of alarm,
and response to inquiry.
Communication Specifications of IF-41GU/IF-41USB (USB Block)
USB block
Specifications
Conforms to USB Revision 1.1
Connector shape
USB series B
Transfer rate
Full speed

6
3. INSTRUCTIONS ON USE
3-1. Checking Source Voltage
・Use the PAR-A series power supply units in the rated source voltage range.
・The rated source voltage of the PAR-A series power supply unit is AC100V, 115V, 120V, 200V,
220V or 230V (voltage fluctuation: ±10%), single-phase, 50Hz or 60 Hz.
・The rated source voltage of the PAR-A series power supply unit may be selected with two
switches on the bottom plate. Be sure to check the source voltage before using the unit. See
section "5-3. Changing Source Voltage" for the method of changing the source voltage setting.
3-2. Connecting AC Cable
・Use an AC power cable suitable to the input voltage rating of the PAR-A unit. Make sure that the
power switch is switched off, and connect the power cable to the AC power inlet securely.
3-3. Precautions for Connecting Output Terminals
・The PAR-A series is a multi-channel power supply unit, which outputs positive and negative
voltages. Do not short the output terminals of the units sharing the same COM. Otherwise, a
trouble occurs.
・The PAR-A series is a floating type power supply unit. When it is used in the floating condition,
high potential difference may be produced between the frame GND and output terminals (and
COM terminal). If the frame GND and output terminals (or COM terminal) are shorted in this
condition, the PAR-A unit and/or instruments connected with it may be damaged. Normally,
short-circuit the GND (frame GND) and COM terminal with the shorting bar supplied with the
product. Make sure that the MAIN OUTPUT key switch is set to OFF before connecting or
removing the shorting bar between/from the COM or GND terminal.
3-4. Installation Environments
・The allowable ambient temperature range of the PAR-A series power supply unit is from 0℃to
40℃. Do not use the unit at a temperature over or below this range. If the unit is used in a hot
place and the internal temperature rises, the built-in overheat protection circuit works and turns
off the MAIN OUTPUT key. Do not use the unit in the condition where the vents in the top panel
and air outlet port in the rear panel are blocked. Blocking these ports will also raise the internal
temperature. Keep sufficient distances between these ports and objects. In some conditions,
hot air blows out of the air outlet port in the rear panel. Be careful.
・Do not use the PAR-A power supply unit in a place with much dust or corrosive gas.
Such substance may enhance deterioration of the product.

7
4. PANELS
4-1. Front Panel
Fig.1 Front Panel
□
1 Voltage indicator (4-digit red LEDs)
・Indicates the set voltage, output voltage, PC address, system address, and software versions of
the PAR-A series and IF-41GU, IF-41USB or IF-41RS (option). The LEDs on the left of the
7-segment LEDs show the negative signs when negative values are displayed.
・The PC address, system address and software version of the IF-41GU, IF-41USB or IF-41RS are
displayed when the IF-41GU, IF-41USB or IF-41RS is used.
・It is possible to change the value of a digit of the seven-segment LEDs indicated by a red LED
below it with the rotary encoder □ 12 .
□
2 Current indicator (4-digit red LEDs)
・Indicates the set current, output current, PC address, system address, OHA alarm and Ear alarm.
The LED on the left of the seven-segment LEDs shows the minus sign and goes on when indicating
a negative value.
・The PC address or system address is displayed when the optional IF-41GU, IF41-RS or IF-41USB
is used.
・It is possible to change the value of a digit of the seven-segment LEDs indicated by a red LED
below it with the rotary encoder □ 12 .
1
2
3
5
6
7
8
9
11
4
12
14
19
20
22
23
21
10
15
16
17
18
13

8
□
3 KEY LOCK/LOCAL key（Green）
・Changes the key lock state (with the LED on) into the local state (with the LED off), and vice versa.
◆See section "6-4. Usage of KEY LOCK/LOCAL Key" below.
□
4 LIMIT key（Green）
・Selects which to display on the voltage indicator □ 1 and current indicator □ 2 : Output values, or
set values.
□
5 PRESET 1,2,3,4 key（Green）
・These keys are used to store the set voltage and current values in PRESET 1 (or 2 to 4) and
recall the stored values.
◆See section "6-3. Memory Function" below.
□
6 MEMORY key（Green）
・Stores store the set voltage and current values in PRESET 1 to 4.
◆See section "6-3. Memory Function" below.
□
7 V key（Green）and A key（Green）
・These keys are used to select which value to change with the rotary encoder □ 12 : Set voltage, or
set current.
□
8 MAIN OUTPUT key（Red）
・Turns on or off a channel selected with the OUTPUT SELECT key □ 9 .
◆See section "6-2 Output Off Function".
□
9 OUTPUT SELECT key and CV/CC status indicator (Green/red）
（1）OUTPUT SELECT key
・Turns on or off the output of each channel. The output of a channel selected with this key is
turned on when the MAIN OUTPUT key is turned on.
（2）CV/CC (power state) indicator
・Indicates the operating state (CV or CC) when the MAIN OUTPUT key □ 9 is on. Lit up
green in the CV state. Lit up red in the CC state.
◆See section "6-2. Output Functions" below.
□
10 DISPLAY（Orange）
・Stores setting of the OUTPUT SELECT and PRESET keys when the power switch is thrown.
◆See section "6-3-5. Storing key setting".

9
□
11 DIGIT key
・Selects a digit of the set voltage or current to be changed.
□
12 Rotary encoder
・Changes the set voltage, current or delay time. Clockwise rotation increases the value.
Counterclockwise rotation decreases it.
□
13 Positive output terminal
・Positive output terminal of power supply.
□
14 Positive remote sensing terminal
・Positive remote sensing terminal for the voltage remote sensing function.
□
15 Positive remote sensing shorting bar
・Connects the positive output terminal and positive remote sensing terminal. Remove this bar
only when using the voltage remote sensing function.
※If this shorting bar is removed when the voltage remote sensing function is not used, voltage
over the set voltage is output through the output terminals of the PAR-Apower supply unit.
□
16 Negative output terminal
・Negative output terminal of power supply.
□
17 Negative remote sensing terminal
・Negative remote sensing terminal for the voltage remote sensing function.
□
18 Negative remote sensing shorting bar
・Connects the negative output terminal and negative remote sensing terminal. Remove this bar
only when using the voltage remote sensing function.
※If this shorting bar is removed when the voltage remote sensing function is not used, voltage
over the set voltage is output through the output terminals of the PAR-Apower supply unit.
□
19 Frame GND terminal
・A grounding terminal for the output terminals.
□
20 Shorting bar
・Short-circuits the output terminals and GND terminal. Remove this bar only when using the
output of the PAR-A power supply unit in the floating condition.

10
□
21 Power switch
・Turns on or off the PAR-A power supply unit.
□
22 Handle
・The unit has a handle at the top. Hold it to move the unit.
※If the unit is mounted in a rack and the handle is unnecessary, it may be removed.
□
23 Feet
・The unit has four feet on the bottom plate.
※If the unit is mounted in a rack and the feet are unnecessary, they may be removed.

11
4-2. Rear Panel
Fig.2 Rear Panel
□
24 Optional board mounting section
・The optional remote control board is mounted in this section.
・The PAR-A power supply unit is supplied with a dummy panel mounted here if it incorporates no
optional board.
□
25 AC power inlet
・Connect theAC power cable to this inlet to supply commercialAC power to the unit.
□
26 Fuse holder
・There is a primary side protection fuse in the fuse holder.
□
27 Air outlet port
・A fan exhausts air through this port.
□
28 External contact control connector J1
・This connector is used for external contact control.
◆See section "7. EXTERNAL CONTACT CONTROL" below.
28
26
25
24
27

12
4-3. Bottom Plate
Fig.3 Bottom Plate
□
30 AC source voltage selector switches 1 and 4
・These switches change the voltage ofAC power source: 100V, 115V, 200V or 230V.
◆See section "5-4 Changing Source Voltage" below.
Front panel
1
2
3
4
30