Programmable High Precision DC
Power Supply
PPX Series
PROGRAMMING MANUAL
Rev. A
ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information, which is protected by
copyright. 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 Dist., New Taipei City 236, Taiwan.
Table of Contents
Table of Contents
SAFETY INSTRUCTIONS .................................................. 4
GETTING STARTED .......................................................... 7
PPX Series Overview .............................. 8
Appearance .......................................... 11
Theory of Operation ............................. 19
REMOTE CONTROL ....................................................... 29
Interface Configuration ........................ 31
Socket Server Examples ....................... 64
Command Syntax ................................. 68
Command List ..................................... 72
Status Register Overview ................... 130
Error List ........................................... 142
APPENDIX .................................................................... 151
PPX Series Default Settings ............... 151
INDEX .......................................................................... 154
3
PPX Series Programming Manual
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 the PPX or to other
properties.
DANGER High Voltage
Attention Refer to the Manual
Protective Conductor Terminal
Earth (ground) Terminal
SAFETY INSTRUCTIONS
This chapter contains important safety
instructions that you must follow during
operation and storage. Read the following before
any operation to insure your safety and to keep
the instrument in the best possible condition.
Safety Symbols
These safety symbols may appear in this manual or on the
instrument.
4
SAFETY INSTRUCTIONS
Do not dispose electronic equipment as unsorted
municipal waste. Please use a separate collection
facility or contact the supplier from which this
instrument was purchased.
General
Guideline
CAUTION
Do not place any heavy object on the PPX.
Avoid severe impact or rough handling that
leads to damaging the PPX.
Do not discharge static electricity to the PPX.
Use only mating connectors, not bare wires, for
the terminals.
Do not disassemble the PPX unless you are
qualified.
Power Supply
CAUTION
WARNING
AC Input Voltage:
100Vac/120Vac/220Vac/240Vac, 50Hz/60Hz,
single phase
Frequency: 47Hz to 63Hz
Before connecting the power plug to an AC line
outlet, make sure the voltage selector switches
of the bottom panel in the correct position.
Disconnect power cord and test leads before
replacing fuse.
The fuse specification is as following:
To avoid electrical shock connect the protective
grounding conductor of the AC power cord to
an earth ground.
Safety Guidelines
5
PPX Series Programming Manual
Cleaning the PPX
Disconnect the power cord before cleaning.
Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid.
Do not use chemicals containing harsh material
such as benzene, toluene, xylene, and acetone.
Operation
Environment
Location: Indoor, no direct sunlight, dust free,
almost non-conductive pollution (Note below)
Relative Humidity: 20%~ 80% (no condensation)
Altitude: < 2000m
Temperature: 0°C to 40°C
(Pollution Degree) EN61010-1:2010 specifies the pollution degrees
and their requirements as follows. The PPX 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
Temperature: -20°C to 70°C
Relative Humidity: 20 to 85%(no condensation)
Disposal
Do not dispose this instrument as unsorted
municipal waste. Please use a separate collection
facility or contact the supplier from which this
instrument was purchased. Please make sure
discarded electrical waste is properly recycled to
reduce environmental impact.
6
GETTING STARTED
PPX Series Overview ............................................... 8
Series lineup ................................................................................................. 8
Main Features .............................................................................................. 8
Accessories .................................................................................................. 9
Appearance ............................................................. 11
Front Panel .................................................................................................. 11
Display Area ................................................................................................ 15
Rear Panel .................................................................................................... 17
Theory of Operation ................................................ 19
Operating Description ............................................................................... 19
CC and CV Mode ....................................................................................... 20
Slew Rate ...................................................................................................... 21
Bleeder Control ........................................................................................... 22
Alarms .......................................................................................................... 23
Considerations ............................................................................................ 24
Grounding ................................................................................................... 27
GETTING STARTED
This chapter describes the power supply in a
nutshell, including its main features and front /
rear panel introduction. After going through the
overview, please read the theory of operation to
become familiar with the operating modes,
protection modes and other safety considerations.
7
PPX Series Programming Manual
Model name
Operation Voltage
Operation Current
Rated Power
PPX-1005
0-10V
0-5A
50W
PPX-2002
0-20V
0-2A
40W
PPX-2005
0-20V
0-5A
100W
PPX-3601
0-36V
0-1A
36W
PPX-3603
0-36V
0-3A
108W
PPX-10H01
0-100V
0-1A
100W
Features
2.4" TFT-LCD Panel.
Preset memory function.
Output ON/OFF delay function.
CV, CC priority start function. (prevents
overshoot with output ON)
Adjustable voltage and current slew rates.
Bleeder circuit ON/OFF setting. (to prevent
over-discharging of batteries)
OVP, OCP, AC Alarm and OTP protection.
Supports test sequence.
Web server monitoring and control. (The
function is activated when connecting to LAN
Interface)
Analog monitor output.
PPX Series Overview
Series lineup
The PPX series consists of 6 models, covering a number of different
current, voltage and power capacities:
Main Features
8
GETTING STARTED
Remote sensing to compensate for voltage drop
in load leads.
Support K type thermocouple temperature
measurement.
With 4 measuring currents and Manual / Auto
shift function.
Interface
Built-in USB, RS-232/485 and LAN interface.
External analog control function.
Optional GPIB interface.
Standard
Accessories
Part number
Description
Qty.
CD-ROM
User manual, Programming manual
1
Power Cord
1
GTL-104A
Test leads for PPX-1005/PPX2005/PPX-3603 (Binding Posts
Terminal), 1m, 10A
1
GTL-105A
Test leads for PPX-2002/PPX-3601,
1m, 3A
1
Short Bar (Binding Posts Terminal)
1
GTL-204A
Test leads for PPX-1005/PPX2005/PPX-3603 (European Type Jack
Terminal), 1m, 10A
1
GTL-203A
Test leads for PPX-2002/PPX3601/PPX-10H01 (European Type Jack
Terminal), 1m, 3A
1
GTL-201A
Ground lead for European Type Jack
Terminal
1
Accessories
Before using the PPX power supply unit, check the package
contents to make sure all the standard accessories are included.
9
PPX Series Programming Manual
Optional
Accessories
Part number
Description
GRA-441-J
Rack for PPX (JIS)
GRA-441-E
Rack for PPX (EIA)
GTL-205A
Temperature probe adaptor with
thermocouple K type
GTL-246
USB Cable (USB 2.0 Type A- Type B Cable,
4P)
GTL-258
GPIB Cable, 2000mm
GTL-259
RS232 cable with DB9 connector to RJ45
GTL-260
RS485 cable with DB9 connector to RJ45
GTL-262
RS485 slave cable
Factory Installed
Options
Part number
Description
Option 1
GPIB interface
10
1
2
3
4
5
6
7
8
9
10
11
12
14
15
13
16
1.
Display
Button
Used to switch among 4 different
display modes.
2.
Knob Key
Used to navigate menu, and to
configure or confirm
voltage/current/time values, among
others. Also, the indicator on the
upper-right corner shows current state
and power mode.
GETTING STARTED
Appearance
Front Panel
11
PPX Series Programming Manual
3.
Left/Right
Arrow Keys
Used to select a parameter number in
the Function settings. Also the left
arrow key can be used as backspace.
4.
Menu Button
Used to enter the Menu page.
M1 Button
(+Shift) Used to recall the M1 setup.
5.
Test Button
Used to run customized test sequence.
M2 Button
(+Shift) Used to recall the M2 setup.
6.
D-Log Button
Used to run data log function.
M3 Button
(+Shift) Used to recall the M3 setup.
7. PROT Button
Used to set OVP, OCP and UVL
protecting functions.
ALM_CLR
Button
+
(+Shift) Used to release protection
functions that have been activated.
The tripped protection alarms include
the following: OVP Alarm, OCP
Alarm, OTP Alarm, AC Alarm, Sense
Alarm, WDOG Alarm, Ah CAP
Alarm, Wh CAP Alarm, TEMP Short
Alarm, TEMP Monitor Alarm.
8.
Shift Button
Used to enable the functions that are
written in blue characters above
certain buttons.
9.
Lock Button
Used to lock all front panel buttons
other than the Output Button.
Unlock/Local
Button
(+Shift) Used to unlock the front panel
buttons or it switches to local mode.
12
GETTING STARTED
10.
Output
Button
Used to turn the output on or off.
11.
USB A Port
USB A port for data transfer, loading
test scripts and firmware update.
12.
TC Input
Terminal to connect the K type
thermocouple cable for temperature
measurement.
13.
Sensing
Terminal
Terminal to connect the sensing
cables, which compensate voltage
drop occurred in load leads.
14.
Power Switch
Used to turn the power on/off.
15.
Output
terminal
DC output terminal for
PPX is European Type
Jack Terminal.
PPX-10H01 the max.
output is 100V/1A/100W
DC output terminal for
PPX is Binding Posts
Terminal or European
Type Jack Terminal.
PPX-1005 the max. output
is 10V/5A/50W
13
PPX Series Programming Manual
DC output terminal for
PPX is Binding Posts
Terminal or European
Type Jack Terminal.
PPX-2002 the max. output
is 20V/2A/40W
DC output terminal for
PPX is Binding Posts
Terminal or European
Type Jack Terminal.
PPX-2005 the max. output
is 20V/5A/100W
DC output terminal for
PPX is Binding Posts
Terminal or European
Type Jack Terminal.
PPX-3601 the max. output
is 36V/1A/36W
DC output terminal for
PPX is Binding Posts
Terminal or European
Type Jack Terminal.
PPX-3603 the max. output
is 36V/3A/108W
16
Display Area
The display area shows set values, output values
and parameter settings.
14
Display Area
1
2
3
4
5 6
7
8
9
10
17
16
15
14 12
13
11
1
2
3
4
5 6
7
10
17
16
15
14 12
13
11
1.
2Wire/4Wire
2-wire or 4-wire indicator.
2.
Voltage Meter
Displays the voltage.
3.
Current Meter
Displays the current.
4.
V/A Set
Guidance
The scrolling symbol indicates to select
between V and A set via scrolling knob key.
External CC &
CV Control
When the external CC or CV control is
activated, the indicator(s) will be shown.
5.
V Set
Manually sets voltage.
6.
I(A) Set
Manually sets current.
7.
Dlog Icon
When Data Logger is enabled, the icon will be
shown accordingly. Note that when SEQ
appears, the icon will be faded out.
SEQ
When Sequence function is turned On, the icon
will be shown accordingly.
GETTING STARTED
15
PPX Series Programming Manual
8.
DLY Icon
When Output On/Off Dly is enabled, the icon
will be shown accordingly. Note that when
SEQ appears, the icon will be faded out.
9.
VSR/ISR
Icon
When CV/CC Slew Rate Priority (CVLS/CCLS)
is activated, the icon will be shown. Note that
when SEQ appears, the icon will be faded out.
10.
CC/CV/UR
indicator
It shows when constant voltage or constant
current mode is ongoing. However, when output
is unregulated, which means neither in CV mode
nor CC mode, it shows UR instead. If it is not
under power output, it simply shows Off.
11.
LAN Indicator
When PPX series connects to LAN network, the
icon will be shown.
12.
Remote Control
Indicator
When remote control (USB/LAN/GPIB,
UART) is underway, the icon will be shown.
13.
USB Indicator
When USB disk is inserted into the front panel
of PPX series, the icon will be shown.
14.
External Output
Indicator
When external output enable is turned On, the
icon will be shown.
15.
Lock Indicator
When the lock mode is activated, the icon will
be shown.
16.
Communication
Monitor
Indicator
When communication monitor is enabled, the
icon will be shown.
17.
Error Indicator
When error occurs from command of remote
control, the icon will be shown.
16
Rear Panel
5
2
1
3
4
6
7
8
1.
Remote-OUT
RJ-45 connector that is used to daisy chain power
supplies with the Remote-IN port to form a
communication bus.
2.
Remote-IN
Two different types of cables can be used for
RS232 or RS485-based remote control.
PSU-232: RS232 cable with DB9 connector kit.
PSU-485: RS485 cable with DB9 connector kit.
3.
LAN
Ethernet port for controlling the PPX remotely
4.
USB
USB port for controlling the PPX remotely.
GETTING STARTED
17
PPX Series Programming Manual
5.
GPIB
GPIB connector for units equipped with IEEE
programming option. (Factory Installed Options)
6.
EXT I/O
External analog remote control connector.
7.
Line Voltage
Input
AC inlet.
8.
AC Select
Switch
The AC selector is located at the
bottom side of the unit.
Switch Voltage to 100V, 120V,
220V or 240V.
18
GETTING STARTED
Background
The PPX power supplies are regulated DC
power supplies with a stable voltage and
current output. These operate within a switch
automatically between constant voltage and
constant current according to changes in the
load.
Suitable supply cord set for use with the equipment:
Mains plug: shall be national approval
Mains connector: C13 type
Cable:
1. Length of power supply cord: less
than 3m
2. Cross-section of conductors: at least
0.75mm2
3. Cord type: shall meet the
requirements of IEC 60227 or IEC
60245 (e.g.: H05VV-F, H05RN-F)
Caution
If the equipment is used in a manner not specified
by the manufacturer, the protection provided by
the equipment may be impaired.
Theory of Operation
The theory of operation chapter describes the basic principles of
operation, protection modes and important considerations that
must be taken into account before use.
Operating Description
19
PPX Series Programming Manual
CC and CV mode
Description
When the power supply is operating in
constant current mode (CC) a constant current
will be supplied to the load. When in constant
current mode the voltage output can vary,
whilst the current remains constant. When the
load resistance increases to the point where the
set current limit (I
SET
) can no longer be
sustained the power supply switches to CV
mode. The point where the power supply
switches modes is the crossover point.
When the power supply is operating in CV
mode, a constant voltage will be supplied to
the load, whilst the current will vary as the
load varies. At the point that the load
resistance is too low to maintain a constant
voltage, the power supply will switch to CC
mode and maintain the set current limit.
The conditions that determine whether the
power supply operates in CC or CV (V
SET
), the
load resistance (RL) and the critical resistance
(RC). The critical resistance is determined by
V
SET/ISET
. The power supply will operate in CV
mode when the load resistance is greater than
the critical resistance. This means that the
voltage output will be equal to the V
SET
voltage
but the current will be less than I
SET
. If the load
resistance is reduced to the point that the
current output reaches the I
SET
level, the power
supply switches to CC mode.
CC and CV Mode
20
GETTING STARTED
Conversely the power supply will operate in
CC mode when the load resistance is less than
the critical resistance. In CC mode the current
output is equal to I
SET
and the voltage output is
less than V
SET
.
RL=R
C
RL<R
C
VSET
ISET
CV
CC
V
I
RL>R
C
Crossover
point
Theory
The PPX has selectable slew rates for CC and
CV mode. This gives the PPX power supply the
ability to limit the current/voltage draw of the
power supply. Slew rate settings are divided
into High Speed Priority and Slew Rate
Priority. High speed priority mode will use the
fastest slew rate for the instrument. Slew Rate
Priority mode allows for user adjustable slew
rates for CC or CV mode. The rising and falling
slew rate can be set independently.
Slew Rate
21
PPX Series Programming Manual
High Speed
Priority
mode
Slew rate =
Enabled
Background
The PPX DC power supplies employ a bleed
resistor in parallel with the output terminals.
PPX
Load
Bleed
resistor
Bleed resistors are designed to dissipate the
power from the power supply filter capacitors
when power is turned off and the load is
disconnected. Without a bleed resistor, power
may remain charged on the filter capacitors for
some time and be potentially hazardous.
In addition, bleed resistors also allow for
smoother voltage regulation of the power
supply as the bleed resistor acts as a minimum
voltage load.
The bleed resistance can be turned on or off
using the configuration settings.
Bleeder Control
22
GETTING STARTED
Note
By default the bleed resistance is on. For battery
charging applications, be sure to turn the bleed
resistance off as the bleed resistor can discharge
the connected battery when the unit is off.
OVP
Over voltage protection (OVP) prevents a high
voltage from damaging the load. This alarm
can be set by the user.
OCP
Over current protection prevents high current
from damaging the load. This alarm can be set
by the user.
UVL
Under voltage limit. This function sets a
minimum voltage setting level for the output.
It can be set by the user.
OTP
Over temperature protection protect the
instrument from overheating
AC ALARM
When AC input voltage or frequency is
abnormal or beyond the AC power range
under operation, the alarm will be generated.
SENSE ALARM
This alarm function is activated when real
output voltage is larger than sense output
voltage.
Alarm output
Alarms are output via the analog control
connector. The alarm output is an isolated
open-collector photo coupler output.
Alarms
The PPX power supplies have a number of protection features.
When one of the protection alarms is set, the ALM icon on the
display will be lit.
23
PPX Series Programming Manual
Inrush current
When the power supply switch is first turned
on, an inrush current is generated. Ensure there
is enough power available for the power
supply when first turned on, especially if a
number of units are turned on at the same
time.
Caution
Cycling the power on and off quickly can cause the
inrush current limiting circuit to fail as well as
reduce the working life of the input fuse and power
switch.
Pulsed or Peaked
loads
When the load has current peaks or is pulsed, it
is possible for the maximum current to exceed
the mean current value. The PPX power supply
ammeter only indicates mean current values,
which means for pulsed current loads, the
actual current can exceed the indicated value.
For pulsed loads, the current limit must be
increased, or a power supply with a greater
capacity must be chosen. As shown below, a
pulsed load may exceed the current limit and
the indicated current on the power supply
ammeter.
Considerations
The following situations should be taken into consideration when
using the power supply.
24
GETTING STARTED
Current limit
level
Measured
Ammeter
current
Reverse Current:
Regenerative load
When the power supply is connected to a
regenerative load such as a transformer or
inverter, reverse current will feed back to the
power supply. The PPX power supply cannot
absorb reverse current. For loads that create
reverse current, connect a resistor in parallel
(dummy load) to the power supply to bypass
the reverse current. To calculate the resistance
for the dummy resistor, RD, first determine the
maximum reverse current, IR, and determine
what the output voltage, EO, will be.
RD(Ω) ≤ EO(V) ÷ IR(A)
PPX
Load
R
D
I
R
I
R
-
+
E
O
Output
Current
Note
The current output will decrease by the amount of
current absorbed by the resistor.
Ensure the resistor used can withstand the power
capacity of the power supply/load.
25
PPX Series Programming Manual
Reverse Current:
Accumulative
energy.
When the power supply is connected to a load
such as a battery, reverse current may flow
back to the power supply. To prevent damage
to the power supply, use a reverse-currentprotection diode in series between the power
supply and load.
PPX
Load
Diode
CAUTION
Ensure the reverse withstand voltage of the diode
is able to withstand 2 times the rated output
voltage of the power supply and the forward
current capacity can withstand 3 to 10 times the
rated output current of the power supply.
Ensure the diode is able to withstand the heat
generated in the following scenarios.
When the diode is used to limit reverse voltage,
remote sensing cannot be used.
26
GETTING STARTED
Floating
As the output terminals are floating, the load
and all load cables must have an insulation
capacity that is greater than the isolation
voltage of the power supply.
PPX
Load
Ext-V
Ext-R
Analog
connector
( ) Insulation capacity > isolation voltage
of power supply
WARNING
If the insulation capacity of the load and load
cables are not greater than the isolation voltage of
the power supply, electric shock may occur.
Grounding
The output terminals of the PPX power supplies are isolated with
respect to the protective grounding terminal. The insulation
capacity of the load, the load cables and other connected devices
must be taken into consideration when connected to the protective
ground or when floating.
27
PPX Series Programming Manual
Grounded output
terminal
If the positive or negative terminal is connected
to the protective ground terminal, the
insulation capacity needed for the load and
load cables is greatly reduced. The insulation
capacity only needs to be greater than the
maximum output voltage of the power supply
with respect to ground.
PPX
Load
Ext-V
Ext-R
Analog
connector
( ) Insulation capacity > voltage of power
supply with respect to ground
CAUTION
If using external voltage control, do not ground
the external voltage terminal as this will create a
short circuit.
28
REMOTE CONTROL
Interface Configuration ........................................... 31
USB Remote Interface ............................................................................... 31
Configuration ........................................................................................ 31
USB CDC Function Check ................................................................ 32
GPIB Remote Interface ............................................................................ 39
Configuration ........................................................................................ 39
GPIB Function Check ........................................................................ 40
UART Remote Interface ........................................................................... 44
Configure UART .................................................................................. 44
UART Function Check ....................................................................... 46
Multiple Unit Connection ......................................................................... 47
Multi Unit Connection ........................................................................ 47
Multiple units Function Check .......................................................... 48
Error Message ............................................................................................. 50
Command Errors ................................................................................. 50
Execution Errors .................................................................................. 51
Devic Specific Errors .......................................................................... 53
Query Errors ......................................................................................... 53
Other SCPI Defined Error Values.................................................... 54
Configure Ethernet Connection .............................................................. 55
Web Server Configuration .................................................................. 55
Web Server Remote Control Function Check ................................ 56
Sockets Server Configuration ............................................................. 58
Socket Server Function Check ........................................................... 59
Socket Server Examples .......................................... 64
Visual Basic Example ................................................................................. 64
C++ Example ............................................................................................. 65
LabVIEW Example ................................................................................... 67
Command Syntax .................................................... 68
Command List ........................................................ 72
REMOTE CONTROL
This chapter describes basic configuration of
IEEE488.2 based remote control.
29
PPX Series Programming Manual
Status Register Overview ........................................ 130
Introduction to the Status Registers ........................................................130
The Status Registers ...................................................................................131
Questionable Status Register Group .......................................................132
Operation Status Register Group ............................................................135
Standard Event Status Register Group ...................................................138
Status Byte Register & Service Request Enable Register .....................140
Error List ................................................................. 142
Command Errors ........................................................................................142
Execution Errors ........................................................................................146
Device Specific Errors ...............................................................................148
Query Errors ...............................................................................................149
30
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