GW Instek PSH-1070AGP User manual

Programmable Power Supply
PSH series
USER MANUAL
GW INSTEK PART NO. XXXX-XXXXXX
ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information, which is protected
by copyrights. All rights are reserved. No part of this manual may
be photocopied, reproduced or translated to another language
without prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves
the rights to change specification, equipment, and maintenance
procedures at any time without notice.
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng City, Taipei County 236, Taiwan.

Table of Contents
3
Table of Contents
Safety Instructions ........................................ 5
Safety Symbols ......................................... 6
Safety Guidelines....................................... 6
Power cord for the United Kingdom .............. 9
PSH Overview .............................................. 11
Main Features ..........................................12
PSH Series Lineup.....................................13
Package Contents .....................................14
Front Panel ..............................................16
Rear Panel ...............................................18
Display....................................................19
Setup ........................................................... 21
AC Power Cable Assembly ..........................22
Remote Sensing and Local Sensing .............24
Load / Remote Sensing Wire Selection.........25
Load Configuration....................................26
Load Wire Assembly..................................30
Remote Sensing Wire Assembly ..................32
Functionality Check...................................34
Rack Mounting (Optional) ..........................40
Panel Operation ........................................... 43
Menu Key Overview ..................................44
Constant Voltage/ Constant Current Crossover
Characteristic ...........................................45
Output Voltage Setting ..............................46
Output Current Setting ..............................47
OVP (Output Voltage Protection) Setting ......48
OCP (Output Current Protection) Setting ......49
Display Contrast Setting ............................50
PSH User Manual
4
Buzzer sound Setting ................................51
Remote Operation.........................................52
Interface Selection....................................53
Command Syntax .....................................57
Command Set ..........................................58
Calibration ....................................................61
Calibration Preparation ..............................62
Entering calibration mode ..........................63
Output Voltage calibration..........................64
Output Current calibration .........................66
OVP Calibration ........................................68
FAQ...............................................................69
Appendix.......................................................71
Specifications...........................................71
Declaration of Conformity ..........................75
Index ............................................................76

Safety Instructions
5
Safety Instructions
This chapter contains important safety
instructions that must be followed when
operating PSH and when keeping it in storage.
Read the following before any operation to
insure safety and to keep the best condition for
PSH.
Safety Symbols Safety Symbols ......................................... 6
Safety
Guidelines
Safety Guidelines....................................... 6
Power Supply ............................................ 7
Fuse ........................................................ 7
Cleaning PSH ............................................ 7
Operation Environment............................... 8
Storage Environment ................................. 8
Power cord Power cord for the United Kingdom .............. 9
PSH User Manual
6
Safety Symbols
These safety symbols may appear in this manual or on PSH.
WARNING Warning: Identifies conditions or practices that
could result in injury or loss of life.
CAUTION
Caution: Identifies conditions or practices that
could result in damage to PSH or to other
properties.
DANGER High Voltage
Attention Refer to Manual
Protective Conductor Terminal
Earth (ground) Terminal
Safety Guidelines
•Do not place any heavy object on PSH.
•Avoid severe impacts or rough handling that
leads to damaging PSH.
•Do not discharge static electricity to PSH.
•Do not block or obstruct cooling fan vent
opening.
•Do not perform measurements at power source
and building installation site (Note below).
•Do not disassemble PSH unless you are
qualified as service personnel.
General
Guideline
CAUTION
(Note) EN 61010-1:2001 specifies the measurement
categories and their requirements as follows. PSH falls
under category II.
Measurement category IV is for measurement performed

Safety Instructions
7
at the source of low-voltage installation.
Measurement category III is for measurement performed
in the building installation.
Measurement category II is for measurement performed
on the circuits directly connected to the low voltage
installation.
Power Supply
WARNING
•Input voltage: 90 ~ 250 V AC, 50/60 Hz
•The power supply voltage should not fluctuate
more than 10%.
•Connect the protective grounding conductor of
the power cord to earth ground, to avoid
electrical shock.
PSH-1036A
PSH-2018A
PSH-3610A
PSH-6006A
6.3A/250V x2
PSH-1070A
PSH-2035A
PSH-3620A
PSH-6012A
6.3A/250V x2
0.5A/250V x1
15A/250V x1
PSH-10100A
PSH-2050A
PSH-3630A
PSH-6018A
6.3A/250V x3
0.5A/250V x1
20A/250V x1
Fuse
WARNING
•Make sure the correct type of fuse is installed
before powering up.
•Replace the fuse with the specified type and
rating only, for continued fire protection.
•Disconnect the power cord before fuse
replacement.
•Make sure the cause of the fuse blowout is
fixed before fuse replacement.
Cleaning PSH •Disconnect the power cord before cleaning.
•Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid
into PSH.
•Do not use chemicals or cleaners containing
harsh materials such as benzene, toluene,
PSH User Manual
8
xylene, and acetone.
Location: Indoor, no direct sunlight, dust free,
almost non-conductive pollution (Note below)
Relative Humidity: < 85%
Altitude: < 2000m
Temperature: 0°C to 40°C
Input Breaker Capacity: Over 20A (PSH-10100A,
2050A, 3630A, 6018A)
This is a Class A product which may cause radio
interference in a domestic environment. In such
case, take adequate measures.
Operation
Environment
WARNING
(Note) EN 61010-1:2001 specifies the pollution degrees
and their requirements as follows. PSH falls under degree
2.
Pollution refers to “addition of foreign matter, solid,
liquid, or gaseous (ionized gases), that may produce a
reduction of dielectric strength or surface resistivity”.
Pollution degree 1: No pollution or only dry,
non-conductive pollution occurs. The pollution has no
influence.
Pollution degree 2: Normally only non-conductive
pollution occurs. Occasionally, however, a temporary
conductivity caused by condensation must be expected.
Pollution degree 3: Conductive pollution occurs, or dry,
non-conductive pollution occurs which becomes
conductive due to condensation which is expected. In
such conditions, equipment is normally protected against
exposure to direct sunlight, precipitation, and full wind
pressure, but neither temperature nor humidity is
controlled.
Storage
Environment
Location: Indoor
Relative Humidity: < 70%
Temperature: −10°C to 70°C

Safety Instructions
9
Power cord for the United Kingdom
When using PSH in the United Kingdom, make sure the power
cord meets the following safety instructions.
NOTE: This lead / appliance must only be wired by competent persons
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT: The wires in this lead are coloured in accordance with the
following code:
Green/ Yellow: Earth
Blue: Neutral
Brown: Live (Phase)
As the colours of the wires in main leads may not correspond with the colours
marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green & Yellow must be connected to the Earth
terminal marked with the letter E or by the earth symbol or coloured Green
or Green & Yellow.
The wire which is coloured Blue must be connected to the terminal which is
marked with the letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked
with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact
the supplier.
This cable/appliance should be protected by a suitably rated and approved
HBC mains fuse: refer to the rating information on the equipment and/or user
instructions for details. As a guide, cable of 0.75mm2 should be protected by a
3A or 5A fuse. Larger conductors would normally require 13A types,
depending on the connection method used.
Any moulded mains connector that requires removal /replacement must be
destroyed by removal of any fuse & fuse carrier and disposed of immediately,
as a plug with bared wires is hazardous if a engaged in live socket. Any
re-wiring must be carried out in accordance with the information detailed on
this label.

PSH Overview
11
PSH Overview
PSH Series are modular-type programmable
switching power supplies designed for broad
range of applications. The series consists of 12
models, output ranging from 360W to 1000W.
Switching technology and built-in PFC control
give PSH higher power efficiency, power density,
and power factor compared with other linear
power supplies. Protection mechanisms keep the
output voltage, current, and temperature within
limit. Remote control interface equipped with
SCPI command set and Lab-View Driver
facilitates ATE software development.
This chapter describes PSH series features and
appearances in a nutshell.
Main features Main Features ......................................... 12
Series lineup 360W..................................................... 13
720W..................................................... 13
1000/ 1080W .......................................... 13
Package
contents
Main unit ................................................ 14
AC input cable kit .................................... 14
Output connection kit ............................... 15
Manual................................................... 15
Panel
descriptions
Front Panel ............................................. 16
Rear Panel .............................................. 18
Display
descriptions
Default display ........................................ 19
Menu mode display .................................. 20
PSH User Manual
12
Main Features
Performance •12 models with wide output range: 6~100A,
10~60V, and 360~1000W.
•High power factor with PFC control
•High efficiency power conversion
•Compact size, light weight
Operation •Constant voltage operation
•Constant current operation
•Output On/Off control
•Built-in buzzer
•Self test and calibration
•LCD display
Protection •Over voltage protection (OVP)
•Over current protection (OCP)
•Over temperature protection (OTP)
Interface •RS-232 (standard) / GPIB (optional) interface
•IEEE 488.2/SCPI compatible command set
•LabView driver
Optional items •GPIB remote control interface
•19 inch standard rack mounting

PSH Overview
13
PSH Series Lineup
PSH series consist of the following 12 models with various output
voltage and current ratings. For the detailed specifications, see
page71.
PSH-1036A
10V, 36A
PSH-2018A
20V, 18A
PSH-3610A
36V, 10A
PSH-6006A
360W
(Mainframe
only)
60V, 6A
PSH-1070A
10V, 70A
PSH-2035A
20V, 35A
PSH-3620A
36V, 20A
PSH-6012A
720W
(Mainframe +
one slave
module)
60V, 12A
PSH-10100A
10V, 100A
PSH-2050A
20V, 50A
PSH-3630A
36V, 30A
PSH-6018A
1000/ 1080W
(Mainframe +
two slave
modules)
60V, 18A
PSH User Manual
14
Package Contents
Check the contents before using PSH series. Contact your local
dealer in case there is a missing item.
Main unit
AC input cable
kit
•Cable gland
•Terminal cover
•AC power input cord

PSH Overview
15
Package Contents (cont.)
Output
connection kit
•Terminal cover
•Output cable screw
Manual •User manual (this document)
•Programming manual
PSH User Manual
16
Front Panel
1 LCD Display
Shows the output and the configuration status.
See page19 for details.
2 Power
Switch
On Off
3 Wheel knob
Sets parameters. Turn right: increase, turn left:
decrease.
4 Output
Switch
Turns the output On or Off. When On, the “OUT”
sign appears on the display.
Out On
OCP OUT
CV 2.58V 2.01A
Out Off
OCP
SET 2.58V 2.01A

PSH Overview
17
5 Vset/ Iset/
Enter key
Switches between voltage setting mode and
current setting mode, or confirm the entered
value in the menu mode (see page44).
Vset (edit Voltage)
OCP
SET 2.58V 2.01A
Iset (edit Current)
OCP
SET 2.58V 2.01A
6 F/C (Fine/
Coarse) key
Switches the editing location and resolution:
before (coarse) or after (fine) the decimal point.
Fine (after decimal)
OCP
SET 2.58V 2.01A
Coarse (before decimal)
OCP
SET 2.58V 2.01A
7 Menu key Enters into the menu mode. For details, see
page44.
Default mode
OCP OUT
CV 2.58V 2.01A
Menu mode (OVP setting)
Set OVP
* 21.10V
8 Local key Switches from remote control mode to local
operation mode (page56), OR releases OVP/OCP
error messages and go back to normal operation
(page37), OR enters the calibration mode when
pressed for more than 5 seconds (page61).
Error message example
OCP Error! Press
“Local” to reset
Calibration mode
Calibration
Voltage
PSH User Manual
18
Rear Panel
1 Ground
Terminal
Connect the output line shield (page25) and
the remote sensing line shield (page32).
2 Output
Terminal
Connect DUT (Device Under Test). For details,
see page24.
3 Sense Terminal
Connect the feedback line to compensate for
cable loss. For details, see page24 (theory),
page32 (cable connection).
4 RS232/ GPIB
Terminal
Connect the remote control line. For remote
control details, see page52. GPIB requires an
optional module. For installation details, see
the service manual.
Note: Only one interface module (RS232 or
GPIB) can be installed at a time.
5 AC input
Terminal
Connect the AC power input cable. For
details, see page22.

PSH Overview
19
Display
Default
display
Display mode
RMT ADRS OCP OUT
CV 10.10V 36.10A
A B C D
E F G
Editing mode
OCP
SET 10.10V 36.10A
A B C D
E F G
A RMT: remote control mode
(Nothing): panel operation mode
Not available in editing mode
B ADRS: RS-232 or GPIB address (available
in remote control)
Not available in editing mode
C OCP: Output Current Protection On
(Nothing): Output Current Protection Off
D OUT: Output On
(Nothing): Output Off
Not available in editing mode
E CV/CC: Current and Voltage display
mode (Constant Voltage/ Constant
Current)
SET: Current and Voltage editing mode
F Output Voltage readback value (display
mode)
Output Voltage setting value (editing
mode)
G Output Current readback value (display
mode)
Output Current setting value (editing
mode)
PSH User Manual
20
Display (cont.)
Menu mode
display
The following displays appear when pressing the
Menu key MENU . To move to the next configuration,
press the Menu key repeatedly. When inactive for
more than 5 seconds, the display goes back to the
default mode.
(Default display)
Output Voltage
Protection setting.
For details, see
page48.
Output Current
Protection setting.
For details, see
page49.
Display contrast
setting. For details,
see page50.
Buzzer setting. For
details, see page51.
Set OVP
21.10V
Set OCP
ON (OFF)
Set Contrast
70%
Set Buzzer
ON (OFF)
Interface RS232
Baud Rate 9600
OCP OUT
CV 2.58V 2.01A
Remote control
interface setting. For
details, see page52.

Setup
21
Setup
This chapter describes load configurations and
setup procedures. Follow these instructions to
properly install PSH series.
AC power cable
assembly
AC Power Cable Assembly ......................... 22
AC power cable requirement ..................... 23
Load
configuration
Remote Sensing and Local Sensing ............ 24
Load / Remote Sensing Wire Selection........ 25
Single Load + Local Sensing...................... 26
Single Load + Remote Sensing .................. 26
Multiple Loads + Local Sensing .................. 27
Multiple Loads + Remote Sensing .............. 27
Series Operation + Local Sensing............... 28
Series Operation + Remote Sensing ........... 29
Wire assembly Load Wire Assembly................................. 30
Remote Sensing Wire Assembly ................. 32
Functionality
Check
Preparation ............................................. 34
Output Voltage & OVP Check ..................... 35
Output Current Check .............................. 37
OCP Check.............................................. 38
Rack mounting
(optional)
Rack mounting kit contents ....................... 40
Rack mounting assembly .......................... 41
PSH User Manual
22
AC Power Cable Assembly
1 Cable gland +
Terminal Cover
Put the power cable through the cable gland and
the terminal cover, screw them together.
2 Cable wire +
Terminal
CAUTION
Screw the wire onto the AC input terminal. Note
the wire color: Neutral (white), GND (green), and
Line (black).
3 Terminal
cover +
Terminal
Screw the terminal cover onto the terminal.

Setup
23
AC power cable requirement
Here is the AC power cable specification, in case of using cables
other than the attached one.
Cable length ≤3m
Cable gland KSS or PG-2013
Cable type
(recommended)
Model: SJT
Type: 3 x 14 AWG stranded copper
Rating: 60°C min, 300V
Diameter: 9.143~10.03 mm
Model: H05 VV-F
Type: 3G 1.5mm2stranded copper
Rating: 300V/500V
Diameter: 8.5 ± 0.2 mm
PSH User Manual
24
Remote Sensing and Local Sensing
Remote sensing compensates the cable loss between PSH and load,
up to 0.5V. Use remote sensing whenever the load voltage has to
be accurate.
Local Sensing
(default)
VSET = VOUT
VOUT > VLOAD
VOUT VLOAD
VOUT
Output
Setting
VSET
|VSET–VOUT|Sense
PSH Load
The sense terminal is internally connected to the
PSH output terminal. The delta between the
voltage setting level (VSET) and the actual output
level (VOUT) is compensated. The load terminal
voltage (VLOAD) might become lower than the
output due to cable loss.
Remote
Sensing
VSET = VLOAD
VOUT > VSET
PSH Load
Sense
VOUT VLOAD
VLOAD
Output
Setting
VSET
|VSET–VLOAD|
The sense terminal is connected to the load input
terminal. The delta between the voltage setting
level (VSET) and the actual load voltage (VLOAD) is
compensated. The output voltage (VOUT) might
become higher than the setting due to the
compensation.

Setup
25
Load / Remote Sensing Wire Selection
The following instructions apply to both load wire and remote
sensing wire, unless noted.
Wire size (FOR
LOAD ONLY)
Load wires must have enough current capacity
to minimize cable loss and load line impedance.
Voltage drop across a wire should not excess
0.5V. The following list is the wire current rating
at 450A/cm2.
Wire size
(AWG)
Max.
current (A)
Wire size
(AWG)
Max.
current (A)
20 2.5 6 61
18 4 4 97
16 6 2 155
14 10 1 192
12 16 1/0 247
10 21 2/0 303
8 36
Wire length To avoid excessive cable loss, shorten the
distance between PSH and load as much as
possible. Remote sensing compensates cable
loss up to 0.5V.
Wire shielding To minimize noise effect and load line
impedance, use shielded pair wiring. Twisted
wires are more effective, especially for remote
sensing.
Wire shield should be connected to the rear
panel ground connector.
PSH User Manual
26
Load Configuration
Select the appropriate configuration for the target application.
For local sensing and remote sensing explanation, see the
previous page.
For connection guideline, see page25 (wire selection), page30 (load
connection), page32 (remote sensing connection).
Single PSH + single load
Single Load +
Local Sensing PSH
—OUT
+OUT
—IN
+IN
Load
—Sense
+Sense
Connect the output wire to the load and the sense
terminal to the PSH local output monitor.
Single Load +
Remote
Sensing PSH
+OUT +IN
Load
+Sense
—IN—OUT
—Sense
Connect both the output wire and the remote
sensing wire to the load.

Setup
27
Single PSH + multiple Load
Condition •Output current for each load follows the load
requirement.
•When the sum of the load current surpasses the
rating, PSH automatically switches to CC
(Constant Current) mode.
Multiple Loads
+ Local
Sensing PSH
+OUT +IN
Load #1
+Sense Load #2
+IN
—IN
—IN
—OUT
—Sense
All loads share one PSH output.
Multiple Loads
+ Remote
Sensing PSH
+OUT +IN
Load #1
+Sense Load #2
+IN
—IN
—IN
—OUT
—Sense
Distribution
Point
Create a distribution point between PSH and the
loads. PSH compensates the cable loss up to the
distribution point.
To maximize compensation, make sure the
distribution point is closer to the load side.
PSH User Manual
28
Multiple PSH + single load (series operation)
Condition •Up to four PSH series (with identical output
ratings) can be cascaded.
•Output voltage is the sum of the cascaded PSH.
•Output current is the same as a single PSH.
Series
Operation +
Local Sensing
PSH #1
+OUT +IN
Load
+Sense
PSH #2
+OUT
+Sense
—IN—OUT
—OUT
—Sense
—Sense
First PSH:
Negative output →Negative load input
Positive output →The next PSH negative output
Intermediate PSH:
Negative output →The previous PSH positive
output
Positive output →The next PSH negative output
Last PSH:
Negative output →The previous PSH positive
output
Positive output →Positive load input

Setup
29
Series Operation (cont.)
Series
Operation +
Remote
Sensing
PSH #1 +OUT
+IN
Load
+Sense
PSH #2 +OUT
+Sense
—IN—OUT
—OUT
—Sense
—Sense
First PSH:
Negative output →Negative load input
Positive output →The next PSH negative output
Negative sense →Negative load input
Positive sense →Positive output monitor
Intermediate PSH:
Negative output →The previous PSH positive
output
Positive output →The next PSH negative output
Negative sense →The previous PSH positive
output
Positive sense →Positive output monitor
Last PSH:
Negative output →The previous PSH positive
output
Positive output →Positive load input
Negative sense →The previous PSH positive
output
Positive sense →Positive load input
PSH User Manual
30
Load Wire Assembly
1. Wire
selection
Select the appropriate wire according to the
guideline on page25.
2. Terminal
screw
replacement
Replace the two screws on the output terminal
with the hex screw in the output connection kit.
3. Terminal
connection
Screw load wires to the terminal.

Setup
31
Load Wire Assembly (cont.)
4. Terminal
cover assembly
Screw the output terminal cover to the rear
panel.
5. Wire shield
connection
(recommended)
Connect the load wire shield to the rear panel
ground connector.
PSH User Manual
32
Remote Sensing Wire Assembly
Select the appropriate wire according to the guideline on page25.
Local sensing The sense terminal is connected to the output
monitor terminal with bare wires.
Remote Sensing 1. Take off the wire jumpers.
2. Screw wires to the sense (S) side.
CAUTION
•Do not screw remote sensing wires to the
monitor (M) side.
•M+, M−are for output monitoring only. NEVER
screw load wires to the remote sensing
terminal.

Setup
33
Remote Sensing Wire Assembly (cont.)
5. Wire shield
connection
To minimize noise effect, we recommend
covering the remote sensing wire with ground
shield and connect it to the ground terminal.
CAUTION An open remote sense circuit leads to output
level overshoot. Make sure the line is securely
connected.
PSH User Manual
34
Functionality Check
Check the PSH basic functionalities before operation.
Preparation
Check items •Output Voltage
•OVP functionality
•Output Current
•OCP functionality
Digital
Multimeter
•DC Voltage Accuracy: <±0.1%
•Recommended model:
GDM-8245, GDM-8246
Current Shunt •Current range: >100A
•Accuracy: <±0.1%
PSH – Current
Shunt cable
•Voltage rating: >70V
•Current rating: >100A
Equipment
Multimeter –
Current Shunt
cable
•N/A
When there is a
problem…
Run calibrations (page61). If this does not solve
the issue, refer to the service center.

Setup
35
Output Voltage & OVP Check
Connection
Digital Multimeter
PSH Series
V
A
— +
Checking step
1. Power On PSH and connect the Multimeter Voltage
measurement terminal.
2. Set Output Voltage and Output Current to the rating value.
•Vset/Iset/Enter key
VSET/ ISET
ENTER
switches the cursor between
Voltage and Current.
•F/C key F/C switches the cursor
between before and after the
decimal point.
•Wheel knob changes the value.
PSH-2018A (20V, 18A)
SET 20.00V 18.00A
3. Press the Menu key once and set the OVP value to rating
voltage + 100mV.
Press the Vset/Iset/Enter
key
VSET/ ISET
ENTER to confirm the OVP
setting.
Set OVP
20.10V
PSH User Manual
36
4. Make sure the Multimeter shows no value (No output).
5. Press the Output key
OUTPUT
and turn On the output.
The display changes into CV
(Constant Voltage) mode and
shows the OUT sign on the top
right corner.
OUT
CV 20.00V 18.00A
6. Make sure the Multimeter reading and the PSH display show
approximately the same Voltage.
7. Increase the PSH output voltage beyond the OVP value.
8. Make sure the display shows an error message.
Press the Local key LOCAL to get
back to the normal display.
OVP Error! Press
“Local” to reset
9. Make sure the output is now turned Off in the display and the
Multimeter shows no value (No output).

Setup
37
Output Current Check
Connection
Digital Multimeter PSH Series
V
A
—+
Current
Shunt
Checking step
1. Power On PSH and connect the Multimeter/ Current Shunt
terminal.
2. Set the Output Voltage and Current value to the rating.
•Vset/Iset/Enter key
VSET/ ISET
ENTER switches
the cursor between Voltage and
Current.
•F/C key F/C switches the cursor
before and after the decimal point.
•Wheel knob changes the value.
PSH-2018A (20V, 18A)
SET 20.00V 18.00A
3. Make sure the Multimeter/Current Shunt shows no output.
4. Press the Output key
OUTPUT
and turn On the output.
5. Make sure the Multimeter/Current Shunt reading and the
PSH display show approximately the same Current.
PSH User Manual
38
OCP Check
Connection
Digital Multimeter PSH Series
V
A
—+
Current
Shunt
Checking step
1. Power On PSH and connect the Multimeter / Current Shunt
terminal.
2. Set the Output Voltage and Current value to the rating.
•Vset/Iset/Enter key
VSET/ ISET
ENTER
switches the cursor between
Voltage and Current.
•F/C key F/C switches the cursor
before and after the decimal point.
•Wheel knob changes the value.
PSH-2018A (20V, 18A)
SET 20.00V 18.00A
3. Press the Menu key twice to view the OCP setting.
Turn the wheel knob to change
OCP setting to ON. Set OCP
ON
Press the Vset/Iset/Enter key
VSET/ ISET
ENTER to confirm the setting.

Setup
39
The OCP sign appears on the
upper side of the display. OCP
CV 20.00V 18.00A
4. Press the Output key
OUTPUT
and turn On the output.
5. Make sure the display shows the error message.
Press the Local key LOCAL to get
back to the normal display.
OCP Error! Press
“Local” to reset
6. Make sure the output is now turned Off in the display and the
Multimeter / Current Shunt shows no value (No output).
PSH User Manual
40
Rack Mounting (Optional)
PSH can be mounted on standard 19 inch rack using GRA-403
rack mounting kit.
Rack mounting kit contents
Main bracket x 1 Front panel x 1
Large decoration board x 1
Medium decoration board x 2
Small decoration board x 2 Binding plate x 6
Handle x 2 Screw M4 * 0.7 L=10mm x 4
Screw M3 * 0.5 L = 8mm x 18