Kikusui PWX750ML User manual

PWX 1
PART NO. IB022997
Dec. 2014
PWX750ML
Installation
and Preparation
Basic Functions
External Control
Parallel/Series
Operation
Maintenance
Specifications
User’s Manual
Regulated DC Power Supply
PWX Series
1
2
3
4
5
6
Isolated Analog Interface 7
OPtions
Troubleshooting
App

2PWX
Thank you for purchasing the PWX750ML Regulated DC
Power Supply.
These manuals are intended for users of the Regulated DC
Power Supply and their instructors. It is assumed that the
reader has knowledge about electrical aspects of regulated
DC power supplies.
Documentation Structure
Safety information
This document contains general safety precautions for this
product. Keep them in mind and make sure to observe
them.
User’s manual (this manual, PDF)
This manual is intended for first-time users of this product. It
provides an overview of the product and notes on usage. It
also explains how to configure the product, operate the
product, perform maintenance on the product, specifications
the product, and so on. To effectively use the product fea-
tures, read this manual from beginning to end.
We recommend that you read it thoroughly before using this
product for the first time.
If you forget how to use the product or if a problem occurs,
we recommend that you refer to this manual again.
Quick reference
This manual explains Panel description and operation
briefly.
Communication Interface Manual (HTML,
partially PDF)
This manual contains details about using commands to con-
trol the product remotely. It also contains details about the
multichannel function (Virtual Multi Channel Bus), which
makes it possible to control up to 31 PWXs from a single
PC.
The interface manual is written for readers with sufficient
basic knowledge of how to control power supplies using a
PC.
The command list is provided in PDF format.
PDF and HTML files are included in the accompanying CD-
ROM.
Adobe Reader 6.0 or later is required to view the PDF files.
Microsoft Internet Explorer 6.0 or later is required to view
the HTML files.
If you find any misplaced or missing pages in the manuals,
they will be replaced. If the manual gets lost or soiled, a new
copy can be provided for a fee. To replace or purchase a man-
ual, please contact your Kikusui agent or distributor. At that
time, inform your agent or distributor of the “Part No.” written
on the front cover of this manual.
Every effort has been made to ensure the accuracy of this
manual. However, if you have any questions or find any errors
or omissions, please contact your Kikusui agent or distributor.
After you have finished reading this manual, store it so that
you can use it for reference at any time.
Firmware versions that this manual cov-
ers
This manual covers firmware versions 2.2X.
When contacting us about the product, please provide us with:
The model (marked in the top section of the front panel)
The firmware version (see page 13)
The serial number (marked on the rear panel)
Trademarks
Microsoft, Windows, and Visual Basic are registered trade-
marks of Microsoft Corporation in the United States and/or
other countries.
All company names and product names used in this manual
are trademarks or registered trademarks of their respective
companies.
Copyrights
The contents of this manual may not be reproduced, in whole
or in part, without the prior consent of the copyright holder.
The specifications of this product and the contents of this man-
ual are subject to change without prior notice.
© 2011 Kikusui Electronics Corporation
When you receive the product, check that all accessories are
included and that the accessories have not been damaged
during transportation.
If any of the accessories are damaged or missing, contact
your Kikusui agent or distributor.
We recommend that you save all packing materials, in case
the product needs to be transported at a later date.
About the PWX750ML Manuals
Component Quantitiy
Power cord 1 pc.
Output terminal cover 1 set
J1 connector plug kit 1 set
Output terminal M6 bolt set 2 sets
Chassis connection wire 1 pc.
Packing list 1 pc.
Quick reference English: 1 pc.
Japanese: 1 pc.
Safety information 1 pc.
CD-ROM 1 disc
Checking the Package Contents

PWX 3
The PWX750ML is a constant voltage (CV)/constant current
(CC) automatic crossover power supply that can output a wide
range of voltage and current within rated output power.
It can be controlled remotely through the standard-equipped
communication feature.
Features
Communication feature
RS232C, USB, and LAN interfaces are all installed as stan-
dard.
The remote interfaces comply with IEEE Std 488.2 1992
and SCPI Specification 1999.0. Because the LAN interface
complies with the LXI standard, the construction of a highly
cost-effective system is possible. If you use the multichan-
nel (VMCB) function, you can construct a multichannel
power supply system in which up to 31 PWXs are controlled
from a single PC.
Master-slave parallel operation
You can increase the PWX750ML’s output current by con-
necting up to four units in parallel. You can set one unit as
the master unit, and control the remaining units as slave
units.
Setting preset feature
You can save up to three sets of output settings (the combi-
nation of the voltage value and current value). You can sim-
ply select a set of output settings that you want to use rather
than having to specify each setting every time.
Automatic output on setting
You can set the PWX750ML so that when a protection func-
tion is activated and the output is turned off, output is auto-
matically turned back on when the problem that caused the
protection function to be activated is fixed.
Set voltage/current limitation feature
You can apply limits to the voltage and current settings.
This prevents you from setting an appropriate value by mis-
take, which would cause the output to turn off.
Overcurrent protection (OCP) detection time setting
You can set a detection time, which is the amount of time
that an overcurrent must persist after the first detection of
the overcurrent before the overcurrent protection (OCP) is
activated. By setting the detection time, you can prevent an
alarm from occurring when an inrush current from the EUT
connected to the output causes an excessive current to flow
temporarily.
Bleeder on/off feature
You can turn the bleeder circuit on and off. Turn the bleeder
circuit off when you do not want the internal bleeder circuit
to sink output current. When you connect a battery, you can
prevent excessive electrical discharges by turning the
bleeder circuit off.
Compatibility with other products
You can set the command language and emulation that are
used during remote control. By setting the command lan-
guage, you can enable the PWX to support the proprietary
commands of other products. By selecting the emulation,
you can remotely control products other than the PWX.
Isolated analog interface (factory option)
You can use isolated optical signals to set and monitor the
output voltage and current. The signal is isolated from the
reference potential of this product.
You can use a voltage control (0 V to 5 V or 0 V to 10 V) or a
current control (4 mA to 20 mA).
Model Maximum
operating
current
Operating
voltage Power
PWX750ML 28 A 0 V to 80 V 750 W
Product Overview

4PWX
When using this product, be sure to observe the “Safety
Precautions” in the Safety information manual.
When installing this product, be sure to observe the
“Precautions Concerning Installation Location” in the
Safety information manual. The following precautions
pertain only to this product.
• When installing this product, be sure to observe the temper-
ature and humidity ranges indicated below.
Operating temperature range: 0 °C to +50 °C
(32 °F to 122 °F)
Operating humidity range: 20 %rh to 85 %rh (no conden-
sation)
• When storing this product, be sure to observe the tempera-
ture and humidity ranges indicated below.
Storage temperature range: -20 °C to +70 °C
(-4 °F to 158 °F)
Storage humidity range: 90 %rh or less (no condensation)
• In this manual, the PWX750ML Regulated DC Power Sup-
ply is referred to as the “PWX Series” or “PWX750ML.”
• The term “PC” is used to refer generally to both personal
computers and workstations.
• The screen captures used in this manual may differ from the
actual screens that appear on the PWX750ML. The screen
captures are merely examples.
• The following markings are used in this manual.
Indicates a potentially hazardous situation which, if
ignored, could result in death or serious injury.
Indicates a potentially hazardous situation which, if
ignored, may result in damage to the product or other
property.
Indicates information that you should know.
Explanation of terminology or operation principle.
Indicates a reference to detailed information.
Indicates reference to detailed information operation man-
ual.
CFxx:x
“CF” stands for a CONFIG parameter. The two digits after
CF indicate the CONFIG parameter number. The value
after the colon indicates the selected setting.
SHIFT+key name (blue characters below the
keys)
Indicates an operation that requires you to press a key
indicated in blue characters (below the key) while holding
down the SHIFT key.
Indicates useful information.
Safety Precautions
Precautions Concerning
Installation Location
Notations Used in This Manual
WARNING
CAUTION
DESCRIPTION
See
Memo

PWX 5
Contents
About the PWX750ML Manuals ..................2
Checking the Package Contents ................2
Product Overview .......................................3
Safety Precautions ......................................4
Precautions Concerning Installation Location
4
Notations Used in This Manual ...................4
Search by Topic...........................................7
Component Names......................................8
1Installation and Prepara-
tion
Connecting the Power Cord............................. 12
Turning the Power On...................................... 13
Turning the POWER switch on ................. 13
Turning the POWER switch Off................. 14
Rack Mounting................................................. 14
Load Considerations........................................ 15
Load Cables..................................................... 17
Connecting to the Output Terminals ................ 18
Sensing............................................................ 20
Local sensing............................................ 21
Remote sensing........................................ 21
2Basic Functions
Measured Value Display and Setting Display.. 24
Panel Operations ............................................. 25
Output Operations............................................ 26
Operation Overview ......................................... 26
CV Power Supply and CC Power Supply ........ 27
Using the PWX750ML as a CV or CC Power Sup-
ply .................................................................... 29
Protection Functions and Alarms..................... 30
Alarm occurrence and clearing alarms...... 30
Protection function activation .................... 31
CONFIG Settings............................................. 36
CONFIG parameter details ....................... 39
Preset Memory Function.................................. 47
Saving settings to preset memory............. 47
Recalling preset memory entries............... 48
Locking Panel Operations (Key lock)............... 49
Bleeder On/Off Feature.................................... 49
Switching from Remote Mode to Local Mode .. 50
Factory Default Settings (Initialization) ............ 51
3External Control
Overview.......................................................... 54
About the J1 Connector................................... 54
Output Terminal Insulation............................... 56
When the output terminal is not grounded
(floating).................................................... 56
When the output terminal is grounded...... 57
Cautions when using the external voltage
(Vext) ........................................................ 58
Controlling the Output Voltage......................... 59
Control using an external voltage (Vext)... 59
Control using an external resistance (Rext)60
Controlling the Output Current......................... 61
Control using an external voltage (Vext)... 61
Control using an external resistance (Rext)62
Controlling the Output On and Off States........ 63
Controlling Output Shutdown........................... 65
Controlling the Clearing of Alarms................... 66
External Monitoring.......................................... 67
4Parallel/Series Operation
Master-Slave Parallel Operation...................... 70
Features of the PWX750ML during master-
slave parallel operation............................. 70
Connection (master-slave parallel operation).
72
Settings (master-slave parallel operation) 74
Starting master-slave parallel operation .. 75
Series Operation.............................................. 76
Features of the PWX750ML during series op-
eration....................................................... 76
Connection (series operation)................... 78
Settings (series operation)........................ 79
Starting series operation........................... 79
5Maintenance
Calibration........................................................ 82
Calibration overview.................................. 82
Calibration procedure................................ 83
6Specifications
7Isolated Analog Inter-
face
Introduction...................................................... 96
Isolated Analog Interface Connector ............... 97
Setup and Operation........................................ 98

6PWX
Appendix
A Options ......................................100
B Troubleshooting........................102

PWX 7
Search by Topic
Troubleshooting
See “Troubleshooting” on page 102
• I want to check the accessories. →See “Checking the Package Contents”
or the included packing list. p.2
• The installation space is limited, so I want
to check the installation conditions. →See the included “Safety Precautions”
document, or the electronic version of
the document on the CD-ROM. –
• How do I connect the AC power supply? →“Connecting the Power Cord” p.12
• What kind of load cables should I use? →“Load Cables” p.17
• How do I ensure stable voltage when the
cables connected to the load are long (the
distance to the load is long)?
→“Sensing” p.20
• How do I rack mount the PWX750ML?
What kind of parts are needed? →“Rack Mounting” p.14
• How do I use remote sensing to stabilize
the PWX750ML?
→“Sensing” p.20
• How do I set the protection functions to
prevent damage to the load?
→“Protection Functions and Alarms” p.30
• After a protection function has been acti-
vated, how do I restart tests automatically
when the cause of the alarm is fixed?
→“Alarm occurrence and clearing alarms” p.30
• How do I set the communication condi-
tions for remote control?
→See the Communication Interface Man-
ual on the CD-ROM. –
• How do I check the settings in preset
memory?
→“Recalling preset memory entries” p.48
• How do I reset the PWX750ML to its fac-
tory default settings?
→“Factory Default Settings (Initialization)” p.51
• How do I use the multichannel (VMCB)
function to construct a multichannel power
supply system?
→See the Communication Interface Man-
ual on the CD-ROM. –
• How do I use the PWX750ML as a con-
stant voltage power supply (CV mode)?
→“Using the PWX750ML as a CV or CC
Power Supply” p.29
• How do I use the PWX750ML as a con-
stant current power supply (CC mode)?
• How do I operate the PWX750ML at a
specific current? How do I save current
values to the preset memory?
→“Preset Memory Function” p.47
• How do I control the output voltage with
an external DC voltage?
→“Overview” p.54
• How do I monitor the output voltage and
output current?
→“External Monitoring” p.67
• How do I use parallel operation to
increase the current capacity?
→“Master-Slave Parallel Operation” p.70
• How do I prevent the settings from being
changed?
→
“Locking Panel Operations (Key lock)”
p.49
• How do I clean the PWX750ML? →See the included “Safety Precautions”
document, or the electronic version of
the document on the CD-ROM. –
• How do I calibrate the PWX750ML? →“Calibration” p.82
Preparation
Setup
Operation
Maintenance

8PWX
Component Names
Front Panel
Display area
5
16 17 18 19 20 21
67 8 9 10 11
23
15
4
1
Display area
1312 14

PWX 9
No. Name Function
1 POWER switch Flip the switch to the ( ) side to turn the power on. Flip it to the ( ) side to turn the
power off. p.13
2CURRENT knob Used to set the current value or select a parameter number in the CONFIG settings. p.25, p.36
FINE Used to make fine current value adjustments. p.25
3VOLTAGE knob Used to set the voltage value or change the value of a CONFIG parameter. p.25, p.36
FINE Used to make fine voltage value adjustments. p.25
4 Air inlet (louver) Air inlet for cooling the inside of the PWX750ML. –
5 OUTPUT key Used to turn output on and off. p.26
6SET key Used to set and confirm the output voltage and output current (the key has an LED). p.24
ALM CLR key Used to release protection functions that have been activated (the key has an LED). p.31
7OCP •OVP keys Used to set and display the overcurrent protection (OCP), overvoltage protection
(OVP), undervoltage limit (UVL) trip points (the key has an LED). p.32
A Used to recall and save the value of preset memory A (the key has an LED). p.47
8CONFIG key Used to configure the various operating conditions (the key has an LED). p.36
B Used to recall and save the value of preset memory B (the key has an LED). p.47
9PWR DSPL key Used to display the output power on the ammeter (the key has an LED). p.24
C Used to recall and save the value of preset memory C (the key has an LED). p.47
10 LOCAL key Used to switch between local mode and remote mode (the key has an LED). p.50
LOCK key Used to lock the operation of all keys other than the OUTPUT key (the key has an
LED). p.49
11 SHIFT key Used to enable the functions that are written in blue characters below the key. –
12 Ammeter Displays the current, power, or the parameter number of a CONFIG parameter. p.24, p.36
13 CC LED Lights in red during constant current mode. p.29
14 Voltmeter Displays the voltage, the value of a CONFIG parameter, or the cause of an alarm. p.24, p.30,
p.36
15 CV LED Lights in green during constant voltage mode. p.29
16 OUTPUT LED Lights in green when output is turned on. Blinks orange when output is on and a pro-
tection function has been activated. p.26, p.30
17 ALARM LED Lights in red when a protection function has been activated, However, does not light when a undervoltage limit (UVL) protection has been activated, Blinks red when the
power limit (POWER LIMIT) has been activated. p.30
18 PRESET LED A: Lights in green when the memory A values are being recalled or saved. B: Lights in green when the memory B values are being recalled or saved.
C: Lights in green when the memory C values are being recalled or saved. p.47
19 LOCK LED Lights in green when the keys are locked. p.49
20 REMOTE LED Lights in green during remote control. –
21 LAN LED
Lights and blinks when the LAN interface is in use.
• No fault status: Lights in green.
• Fault status: Lights in red.
• Standby status: Lights in orange.
• WEB identify status: Blinks green.
–
See

10 PWX
Rear Panel
No. Name Function
1 DC OUTPUT Output connector p.18
2 USB USB port for controlling the PWX750ML remotely
Interface
Manual
3 RS232C RS232C port for controlling the PWX750ML remotely
4 LAN Ethernet port for controlling the PWX750ML remotely
5 Air outlet Air outlet for cooling the inside of the PWX750ML –
6 AC INPUT AC inlet p.12
7 Chassis terminal Connector for grounding the output –
8Sensing terminal connec-
tors Terminals to connect the sensing cables p.20
9 J1 External control connector p.54, p.69
10 Option slot Slot for the isolated analog interface option (factory option) p.95
* The serial number is displayed on the side of the product next to the AC inlet.
634
78 9 10
25
1
See

Installation and Preparation
This chapter describes how to turn on the
PWX750ML, what kind of load cables to
use, and how to connect cables to the out-
put connectors.

12 PWX
Connecting the Power Cord
This product is a piece of equipment that conforms to IEC Overvoltage Category II (equip-
ment that consumes energy supplied from a fixed installation).
1Check that the AC power line meets the nominal input rating of the prod-
uct.
The product can receive a nominal line voltage in the range of 100 Vac to 240 Vac at
50 Hz or 60 Hz.
2Check that the POWER switch is turned off.
3Connect the power cord to the AC inlet on the rear panel.
4Insert the power plug into a grounded outlet.
WARNING
Risk of electric shock.
• This product is a piece of equipment that conforms to IEC Safety Class I (equipment
that has a protective conductor terminal). Be sure to earth ground the product to
prevent electric shock.
• The product is grounded through the power cord ground wire. Connect the protec-
tive conductor terminal to earth ground.
• Use the supplied power cord to connect to the AC line. If the supplied power cord cannot
be used because the rated voltage or the plug shape is incompatible, have a qualified engi-
neer replace it with an appropriate power cord that is 3 m or less in length. If obtaining a
power cord is difficult, contact your Kikusui agent or distributor.
• The power cord with a plug can be used to disconnect the PWX750ML from the AC power
line in an emergency. Connect the plug to an easily accessible power outlet so that the plug
can be removed from the outlet at any time. Be sure to provide adequate clearance around
the power outlet.
• Do not use the supplied power cord for other devices.

PWX 13
1
Installation and Preparation
Turning the Power On
Turning the POWER switch on
p.51 When you turn the POWER switch on for the first time after purchase, the PWX750ML starts
with its factory default settings. Subsequent times that you turn the PWX750ML on, it starts
with the panel settings (excluding the output on/off setting) that were in use immediately
before the POWER switch was turned off.
p.39 You can use the CONFIG settings (CF02) to select how the PWX750ML starts when the
POWER switch is turned on.
1Check that the power cord is connected correctly.
p.19 2Check that the OUTPUT terminal cover is attached.
When the product is shipped from the factory, the OUTPUT terminal cover is not
attached.
3Turn the POWER switch on ( ).
All the LEDs light, and then the voltmeter and the ammeter display the following
sequence of information: the rated voltage and rated current, the firmware version
number, the build number, and then the selected interface. Each item is displayed for
approximately 1 second.
After a few seconds, the PWX750ML enters the operation standby state (the output
value is displayed).
Inrush current
When the POWER switch is turned on, an inrush current of up to 70 A flows. Check that suffi-
cient current capacity is available in the AC power line or the switchboard, particularly if you
are using multiple PWX750ML and turning on their POWER switches simultaneously.
WARNING
Risk of electric shock. Regardless of whether load cables are connected to the output
terminals, be sure to attach the OUTPUT terminal cover before turning the POWER
switch on.
CAUTION
You can use the CONFIG settings to set how the PWX750ML starts when you turn the
POWER switch on. Depending on the setting, the output may be turned on automatically
when the POWER switch is turned on. In case that you connect a load without setting OVP
and OCP to the appropriate values, the load may be damaged if output automatically turns
on at the PWX750ML power-on.
See
See
See
Firmware version display
(Version 1.00 in this example)
Rated voltage and rated current display
(The PWX750ML is being used in this
example.)
Build number display
(Build number BLD 0120 in this example.)
Interface display
(The LAN interface is selected in this
example.)

14 PWX
Rack Mounting
Turning the POWER switch Off
Flip the POWER switch to the ( ) side to turn the PWX750ML off.
The PWX750ML saves the panel settings (except the output on/off setting) that were in use
immediately before the POWER switch was turned off.
p.39 You can use the CONFIG settings (CF02) to select how the PWX750ML starts when the
POWER switch is turned on.
If the POWER switch is turned off immediately after the settings have been changed, the last
settings may not be stored.
Rack Mounting
p.100 You can mount one or two PWX750MLs side by side to a rack. You can use brackets or slide
rails to mount the PWX750ML to a rack.
Remove the rubber feet before you mount the PWX750ML to a rack.
If you are mounting two PWX750MLs side by side, install the optional support board to sup-
port the two PWX750MLs.
Attach the optional support angles (KRB1-PWX SUPPORT ANGLE) to support the
PWX750ML.
We recommend that you keep all pieces that you have removed from the PWX750ML. You
will need these pieces if you remove the PWX750ML from the rack.
If you remove the PWX750ML from the rack, re-attach the original rubber feet.
When using several PWX750ML power supplies together, such as for master-slave parallel
operation or series operation, mount them to a rack before use.
You can mount the PWX750ML to the Kikusui KRC series and KRO series racks.
Removing the rubber feet
Loosen the screws to remove the rubber feet (in four locations).
See
CAUTION
After you turn the POWER switch off, wait at least 10 seconds after the panel display turns
off before you turn the POWER switch back on. Repeatedly turning the POWER switch on
and off at short intervals can cause damage to the inrush current limiter. Furthermore, this
will shorten the service life of the POWER switch and the internal input fuse.
See
Rubber foot
Screw (4 locations)
M3 screw
Max. depth: 8 mm [0.31 inches]
()

PWX 15
1
Installation and Preparation
Load Considerations
Note that the output will become unstable if the following types of loads are connected.
Loads with peak current or pulse-shaped current
The PWX750ML only indicates mean values. Even when the indicated value is less than or
equal to the set constant current, the peak values may exceed the set constant current. If this
happens, the PWX750ML is instantaneously put into constant-current mode, and the output
voltage drops.
For these types of loads, you must increase the set constant current or increase the current
capacity.
Loads that generate reverse current to the power supply
The PWX750ML series cannot absorb reverse current from the load. Therefore, if a regener-
ative load (such as an inverter, converter, or transformer) is connected, the output voltage
increases and becomes unstable. This can cause a malfunction.
For these types of loads, connect a resistor (RD) as shown in the following figure to bypass
the reverse current. However, the amount of current to the load decreases by Irp.
Load current with peaks Pulse-shaped load current
Set constant current
Ammeter reading (mean value)
Set constant current
Ammeter reading (mean value)
IO
RD
EO
Equivalent circuit of the PWX750ML Regenerative load
 ＋
0
Reverse current
-IO
+IO
Irp
RD(in Ω) ≤
RD: Reverse current bypass dummy load
EO: Output voltage
Irp: Maximum reverse current
EO (in V)
Irp (in A)
Load
Output current
CAUTION
Use a resistor with sufficient rated power for RD. If a resistor with insufficient rated power for
the circuit is used, resistor RDwill burn out.

16 PWX
Load Considerations
Loads with accumulated energy
Connecting a load with accumulated energy, such as a battery, to the PWX750ML may cause
current to flow from the load to the internal circuit of the PWX750ML. This current may dam-
age the PWX750ML or reduce the life of the load.
For this type of load, connect a reverse-current-prevention diode (DRP) between the
PWX750ML and the load in series as shown in the following figure.
This cannot be used in conjunction with remote sensing.
PWX750ML Load with accumulated energy
DRP: Reverse-current-protection diode
DRP
CAUTION
• To protect the load and the PWX750ML, use a DRP that conforms to the following
specifications.
Reverse voltage withstand capacity:
At least twice the rated output voltage of the PWX750ML.
Forward current capacity:
Three to ten times the rated output current of the PWX750ML.
A diode with small loss.
• Be sure to take into account the heat generated by DRP. DRP will burn out with inadequate
heat dissipation.

PWX 17
1
Installation and Preparation
Load Cables
The cables’ allowable current depends on the insulation’s maximum allow-
able temperature.
A cable’s temperature is determined by the resistive loss based on the current, the ambient
temperature, and the cable’s external thermal resistance. The following table shows the cur-
rent capacity of heat-resistant vinyl wires that have a maximum allowable temperature of
60°C, assuming that a wire is stretched out horizontally in air in an ambient temperature of
30°C. The current capacity must be reduced under certain conditions, such as when vinyl
cables that have a low heat resistance are used, when the ambient temperature is 30 °C or
greater, or when cables are bundled together and little heat is radiated.
Taking measures against noise
When connecting wires that have the same heat resistance, separating the wires as much as
possible to increase heat radiation enables a greater amount of current to flow. However, wir-
ing the + (positive) and - (negative) output wires of the load cable side by side or bundling
them together is more effective against unwanted noise. The Kikusui-recommended currents
shown in the above table are allowable currents that have been reduced in consideration of
the potential bundling of load cables. Use these values as a guideline when connecting load
cables.
Limitations of the remote sensing function
All wires have resistance. As the wire becomes longer or the current becomes larger, the volt-
age drop in the wire becomes greater. This results in a smaller voltage being applied at the
load end. The PWX750ML has a sensing function that compensates for this voltage drop up
to approximately 4 V for a single line. If the voltage drop exceeds this level, use wires that
have a greater cross-sectional area.
WARNING
Risk of fire.
• Use load cables whose capacity is adequate for the PWX750ML’s rated output cur-
rent.
• The output connector and its surrounding area become hot. Use cables whose cov-
ers have heat resistance at 85 °C and higher.
Risk of electric shock.
• Use load cables whose rated voltage meets or exceeds the PWX750ML’s isolation
voltage.
Nominal cross-sectional
area [mm2]AWG (reference cross- sectional area) [mm2]Allowable current1[A]
(Ta = 30 °C)
1 Excerpt from Japanese laws related to electrical equipment.
Kikusui-recommended
current [A]
2 14 (2.08) 27 10
3.5 12 (3.31) 37 -
5.5 10 (5.26) 49 20
8 8 (8.37) 61 30
14 6 (13.3) 88 50
22 4 (21.15) 115 80
30 2 (33.62) 139 -
38 1 (42.41) 162 100
50 1/0 (53.49) 190 -
60 2/0 (67.43) 217 -
80 3/0 (85.01) 257 200
100 4/0 (107.2) 298 -
125 - - 344 -
150 - - 395 300
200 - - 469 -

18 PWX
Connecting to the Output Terminals
1Turn the POWER switch off.
Check that there is no voltage across the output terminals.
2Connect one end of the included chassis connection wire to the chassis
terminal, and then connect the other end of the wire to the negative or
positive output terminal.
Use the screw that is attached to the PWX750ML to connect the wire to the chassis
terminal. Use the screw that is attached to the output terminal to connect the wire to
the output terminal.
3Attach crimping terminals to the load cables.
The output terminals have bolt holes (M6) for connecting the load cables. Use crimp-
ing terminals that are designed for M6 bolts.
4Use the included bolt set to connect the load cables to the output termi-
nals.
Connect the positive cable to the positive output terminal and the negative cable to
the negative output terminal.
WARNING
Risk of electric shock.
• Turn the POWER switch off before you touch the OUTPUT terminals.
• Even if you turn the output off or turn the POWER switch off, if the bleeder on/off set-
ting (CF11) is set to “oFF,” the voltage that was present when the output was on will
remain at the output terminals. Set the bleeder on/off setting to “on” before you
touch the output terminals.
• Regardless of whether load cables are connected to the output terminals, be sure to
attach the OUTPUT terminal cover before turning the POWER switch on.
- terminal
Chassis terminal
+ terminal
Screw (M3)
Screw (M4)
Chassis connection wire
Use an M3 screw and an
M4 screw to connect the
wire.
Crimping terminal
Bolt (M6)
Spring washer
Washer
Nut
Use the M6 bolt set to
connect the cables.

PWX 19
Connecting to the Output Terminals
1
Installation and Preparation
Attaching the OUTPUT terminal cover
1Remove the screw that is attached next to the output terminals on the
PWX750ML.
Use this screw to attach the OUTPUT terminal cover.
2Place the bottom half of the OUTPUT terminal cover underneath the load
cables connected to the output terminals.
3Align the hooks of the top half of the OUTPUT terminal cover with the
bottom half of the OUTPUT terminal cover.
4Pushing the top half of the OUTPUT terminal cover toward the rear
panel, slide the top half of the OUTPUT terminal cover onto the bottom
half.
Continue sliding the cover until you hear a click.
5Push the OUTPUT terminal cover against the rear panel, and then use
screws to fix the cover in place.
Make sure that both screws are securely fastened.
Memo
Both the top and bottom
of the OUTPUT terminal
cover are the same
shape.
Remove the screws, and
then line up the cover.
Memo
It is easier to slide the
OUTPUT terminal cover
in place if you make the
load cables perpendicular
with the PWX750ML.
Push this part toward the panel.
Continue sliding the cover until
you hear a click.
Top cover
Bottom cover
Line up the two halves so
that the protruding parts of
the top cover are in front of
the protruding parts of the
bottom cover.
After you have lined up the top
and bottom covers, use the
screws to fix them in place.
Screws (M3)

20 PWX
Sensing
When the PWX750ML is shipped from the factory, terminal cover and connector are attached
to the sensing terminals. For safety reasons, when not using the sensing terminals, be sure to
attach to terminal cover.
If they are damaged or lost, contact your Kikusui agent or distributor.
Connecting the sensing cables
If the sensing cables come loose, the output voltage across the load may become unstable,
and an excessive voltage may be applied to the load. If an appropriate OVP trip point is set,
the OVP will trip before an excessive voltage is generated.
When you are finished with remote sensing, return the PWX750ML to local sensing mode.
84-61-7305
Connector
P1-000-109
Terminal cover
WARNING
Risk of electric shock and damage to internal circuits.
• Never wire the sensing terminals while the POWER switch is turned on.
• Use sensing cables whose rated voltage is higher than the PWX750ML’s isolation
voltage. Protect the uncovered sections of the shielded cable by using insulation
tubes whose withstand voltage is greater than the PWX750ML’s isolation voltage.
• The sensing terminals are at approximately the same electric potential as the nega-
tive output terminal. Insert the cables so that the wire strands do not touch the chas-
sis when they stick out of the sensing terminal. Also, insert the cables so that the
stripped wires do not stick out of the terminal.
• Even if you turn the output off or turn the POWER switch off, if the bleeder on/off set-
ting (CF11) is set to oFF, the voltage that was present when the output was on will
remain at the output terminals. Set the bleeder on/off setting to on before you touch
the sensing terminals.
• Regardless of whether local sensing or remote sensing is used, be sure to attach the
sensing terminal cover before turning the POWER switch on.
Strip 7 mm (0.28 inches) of the
cable covering, and then insert
the cable here.
Incorrect Incorrect
Correct
The wire itself is
in contact with
the chassis.
Wire scraps are
in contact with
the chassis.
Strip gauge
7 mm (0.28 inches)
Use this screw to fix the
cables in place so that they do
not come loose.
Local sensing jumpers
Terminal Function
-S Negative remote sensing terminal
-LS Negative local sensing terminal Connected to the negative output
terminal
— Not connected
+LS Positive local sensing terminal Connected to the positive output
terminal
+S Positive remote sensing terminal
Sensing
cable AWG28 to AWG16