Circuit-test PSC-6916 User manual

1
OPERATION
MANUAL
CIRCUIT-TEST
Switching Mode
Power Supply
PSC-6916
1-16VDC @ 60A
PSC-6932
1-32VDC @ 30A
PSC-6960
1-60VDC @ 15A

2
PSC-6916 / 6932 / 6960 08R14

3
WARNING ...............................................................................................page 5
CAUTION ........................................................................................................ 5
INTRODUCTION ............................................................................................... 6
WARRANTY ..................................................................................................... 6
CONTROLS AND INDICATORS .......................................................................... 7
CONTROL MODE SELECTION ........................................................................... 8
OPERATING INSTRUCTIONS ........................................................................... 10
REMOTE SENSING (only PSC-6916) ................................................................ 13
ANALOGUE REMOTE CONTROL MODE ......................................................... 14
FAULTS AND TROUBLE SHOOTING ................................................................. 17
SPECIFICATIONS ............................................................................................ 19
PC INTERFACE CONTROL ............................................................................... 20
APPENDIX ..................................................................................................... 30
Contents

4
Keep this manual in a safe place for quick reference at all times.
This manual contains important safety and operation instructions for correct use
of the power supply. Read through the manual and pay special attention to the
markings and labels of this unit and equipment to be connected.
Pay special attention to these two types of notices used in this manual
WARNING: Failure to observe this warning may cause injury to persons
and damage to power supply or connected equipment.
CAUTION: Failure to observe this warning may result in damage to
equipment and improper functioning of the power supply.

5
2. Caution
• Use a grounded 3 pin AC source.
• This unit is for indoor use only.
• Do not operate or place this unit in a humid, dusty, direct sunlight location or
near any heat source.
• Before plugging into local AC mains, check the rating label at the back of the
unit.
• Do not block any ventilation openings of the unit.
• This unit must be used within the specified rating, regular excessive continuous
loading will damage the power supply.
• The gauge size of input power cable must be at least 0.75mm2 and the total
length of power cable must not exceed 3m.
1. Warning
• Do not use this power supply near water.
• Do not operate or touch this power supply with wet hands.
• Do not open the casing of the power supply when it is connected to AC mains.
• Refer all servicing to qualified service personnel only.
• Replace the AC fuse with the same type and rating as the original fuse.
• Do not touch the metal part of the output terminals.
• This power supply is designed for using in non-cascade environment. It is not
recommended to connect two or more power supplies in parallel or in series.
• Analogue Remote Control or Remote Programming via USB function is only
suitable for stand-alone one unit operation.
• Do not use this power supply with electrical motors, solenoid or inductive load
that generates a back EMF and voltage transient which may damage the power
supply

6
4. Warranty
Circuit-Test Electronics warrants to the original purchaser that this product be
free of defect in material or workmanship for a period of 2 years from the date
of purchase.
Any product which has been subjected to misuse or accidental damage is ex-
cluded from the warranty. Except as stated above, Circuit-Test Electronics makes
no promises or warranties either expressed or implied including warranties of
merchantability or the fitness for any particular purpose.
3. Introduction
This family of efficient, upgraded SMPS with small form factor, auto cross over
CV CC, 3 VI presets, remote control offers unique solution for various loading
conditions and applications.
The dual action (coarse/fine tune) rotary encoder tuning with MCU makes setting
the voltage and current levels ever so smooth, precise and fast. Setting, chang-
ing, and checking the current limit level can be done easily without sparking the
output poles.
The analogue remote control functionality allows the output power on/off, voltage
& current can be adjusted without touching the front panel of the power supply.
The USB port is added for access to computer to run cyclical operation with max.
20 programmable sets of preset voltage and current with different time duration
and up to 999 cycles.
It is suitable for a wide range of applications such as laboratory, telecommunica-
tion, production testing, field test of voltage critical distant load, powering of DC
network, etc.
The 3 user defined presets facilitate quick access to frequently used VI settings.

7
5. Controls and Indicators
(1) LED panel meter display with CC/CV Indictor
(2) Rear Control Indicator (lights up when using Preset/ Remote Control/ Set
mode)
(3) Output Voltage Control Knob (control both the main and auxiliary output
voltage)
(4) Output Current Control Knob (control both the main and auxiliary output
current limit)
(5) Power ON/OFF Switch
(6) Aux. output terminal (max 5A)
Note: PSC-6916: The total rated current (Aux.+Main) is 60A
PSC-6932: The total rated current (Aux.+Main) is 30A
PSC-6960: The total rated current (Aux.+Main) is 15A
(7) Output Terminal (Rated 60A for PSC-6916/ Rated 30A for PSC-6932/ Rated
15A for PSC-6960)

8
(8) Remote Sensing Terminal (for model PSC-6916 only)
Warning • Do not short the remote sensing terminals
• Connecting the remote sensing terminals in reverse
polarity will damage the power supply.
(9) Mode Selection Switch (Normal, Preset, Remote Control, Set Modes)
(10) Recall Selection Switch
(11) Analogue Remote Control Terminal
(12) Cooling Fan Air Intake Grill
(13) AC Input
(14) USB port (for access to computer to run cyclical operation with programmable
voltage, current, period time and cycle)
6. Control Mode Selection
There are 4 modes, Normal, Preset, Set and Remote Control mode for the power
supply.
Slide the Mode Selection Switch (9) to your desired Mode.
The power supply is factory preset to Normal Mode with maximum current level CC.
6.1 Normal Mode
6.2 Preset Mode
a. In this mode, the Rear Control Light is ON to indicate panel V & I controls
are de-activated.
b. There are 3 preset output P1/ P2/ P3 at the Recall Selection Switch (10)
c. The preset values are factory set as following table.
d. End user can set his own output rating, please refer to paragraph 6.3
This is the factory preset mode and the power supply output V, I are controlled
by the dual action tuning knobs. Push the knobs to toggle the coarse and
fine tuning, notice the subtle changes in brightness of related LED. Adjust
the knobs to your desired values by trying coarse and fine tuning. To check
the preset current level, just turn the Current Knob slowly in any direction.
The display will resume its normal brightness after few seconds to double
confirm your adjustment.

9
Recall No. Output Voltage Output Current
P1 5V Maximum
P2 13.8V Maximum
P3 PSC-6916: 15V
PSC-6932: 25V
PSC-6960: 55V
Maximum
6.3 Set Mode - First enter into the Set Mode by pushing Switch (9)
to Set Mode slot.
The power supply is then ready to be preset.
a. Select the Recall Switch (10) to the position P1, P2 or P3 which you want
to set
b. Adjust the front panel voltage control knob to set your desired voltage value
c. Adjust the front panel current control knob to set your desired current
limit value
d. Repeat the procedure for remaining recalls P1, P2, P3 if desired.
e. Move Mode Switch (9) from Set to Preset position to confirm your settings.
NOTE:
All preset values will remain unchanged even after the power supply has been
turned off. Always check output voltage of Presets before connecting to Load.
To check the preset values, move Mode Switch (9) to preset position. Move
the Recall Switch (10) to P1, P2 or P3. The V and I settings of corresponding
RECALL P1, P2, P3 will be show on the panel meters.
6.3.1 To define the preset output P1/ P2/ P3.
a. Turn OFF the power supply
b. Push and hold both front panel voltage and current control knobs at the
same time
c. Turn ON the power supply again
d. Release front panel voltage and current control knobs
6.3.2 To reset the unit back to factory setting
6.4 Analogue Remote Control Mode
To control the output voltage and current by remote control connector (11)
Please refer to Section 9.

10
Model Number Output Voltage Range Total Rated Current
PSC-6916 1 ~ 16V 0 ~ 60A
PSC-6932 1 ~ 32V 0 ~ 30A
PSC-6960 1 ~ 60V 0 ~ 15A
7. Operating Instructions
7.1 This series has 3 models. Make sure you have used the correct one. They have
different output voltage range and current as following:
7.2 Check the rating label of the power supply and make sure it complies with
your AC mains voltage. Connect the power supply to the AC Mains using the
provided power cord.
Make sure the Mode Switch (9) is at Normal Position.
7.3 The power supply will perform a series of self checks when it is switched ON.
The LED and other indicators on the front panel will turn on. When the
cooling fan is being checked, a high speed wind noise can be heard.
After the self checks, the CV, V and A LED indicators are lit up displaying voltage
and 0.0 current. To find out about the set CC current level, just turn the current
control knob one click in either direction. The current display returns to 0.0 after
a few seconds.

11
Table indicating the self test sequence
Self test display and Sequence Test contents
To show software version
Segment check
C.V. Indicator check
C.C. Indicator check
Rear control indicator check
Return to C.V.
Start to check
Over voltage protection check
Over load protection check
Over temperature protection check
Fan check
Output off (remote control mode)

12
The rotary encoder control knobs have fine and coarse tuning with clicking move-
ment. Push the knobs to toggle between coarse and fine tuning, notice the subtle
changes in brightness of related LED. Adjust the knobs to your desired values by
trying coarse and fine tuning. The display will resume its normal brightness after
few seconds to confirm your adjustment.
7.4 Using the control knobs
7.5 Connect the equipment to the power supply. Red (+) is connected to the
positive polarity input of the equipment and Black (-) is connected to the nega-
tive polarity input of the equipment.
7.6 Switch ON the power supply first and the panel meter & green CV Indicator
should light up again.
7.7 Switch ON the equipment and the panel meter & green CV Indicator should
still remain in green.
7.8 You can now operate the equipment. NOTE: When an operation is com-
plete, switch off the equipment first and then switch off the power supply.

13
8. Remote Sensing (Only PSC-6916 has this
function)
8.1 Connection:
1. First complete the power connections between power supply and equipment.
2. Check and make sure the power connections are secured.
3. Then make connections between Remote Sensing Terminal and equipment.
Warning • Never short the Remote Sensing Terminal
• Always disconnect Remote Sensing Terminal first.
• Never connect the Remote Sensing Terminal in reverse
polarity
Connections between Remote Sensing, Power Output and Equipment.
8.2 Disc onnection:
1. First disconnect the remote sensing connections.
2. Then disconnect the power connections between the power supply an
equipment.
NOTE: The remote sensing wire should be at least 22AWG.
Warning • Disconnecting in wrong sequence will damage the
power supply.

14
9.1 Method A: Using two external variable DC voltage sources
Remote Socket Pin Assignment for external variable voltage source
PIN FUNCTIONS REMARKS
1 Internal DC +5V Less then 50mA
2 Voltage Adjust 0 - 5V
3 Current Adjust 0 - 5V
4 Ground
5 Output OFF Short to Ground
6 N.A.
7 N.A.
8 N.A.
9. Analogue Remote Control Mode
There are two methods for remote control of current and voltage adjustment.
NOTE: Both methods require both the current remote control part and the volt-
age remote control part to be set up and be in-use at the same time in order for
analogue remote control mode to be functional. Otherwise unit will be in CC mode
all the time and the analogue remote control will not be functional.
CC current setting by remote control.
Short circuit the main output with 12AWG wire.
Adjust the CC current using external power supply connected to Pin 3.
Output voltage setting by remote control.
Check the output voltage range of the power supply by varying the external
voltage source connected to Pin 2.

15
9.2 Method B: Using two 0 – 5K Ohm variable resistors
Remote Socket Pin Assignment for variable resistor
PIN FUNCTIONS REMARKS
1 Internal DC +5V Resistor end
2 Voltage Adjust Variable part of resistor
3 Current Adjust Variable part of resistor
4 Ground Another resistor end
5 Output OFF Short to Ground
6 N.A.
7 N.A.
8 N.A.
CC current setting by remote control.
Short circuit the main output with 12AWG wire.
Adjust the CC current setting using the 0-5k Ohm variable resistor.
Output voltage setting by remote control
Check the output voltage range of the power supply by adjusting the 5Kohm
variable resistor.
Two variable resistors must be set up at the same time in order for the remote
control to be functional.

16
9.3 Remote Output ON/OFF Control
A. By default, Pin 5 is open and output is ON.
B. Shorting Pin 5 to Pin 4 (ground) and output is off.
C. When output is off, the C.V. & C.C. LED will flash. The current output volt-
age and current setting will show on the panel meter.
D. You also can adjust the output by voltage & current control knob to your
desired value when output is off.
This remote output on/off control can be activated in any of the modes Normal,
Preset, Remote and Set mode.
NOTE: using the 8pin remote plug provided and connect with 22AWG wires.
Pin numbers are
marked on the
black portion.
The allowable fastest switching On/Off frequency is two times per second. When
the On/Off frequency is over two per second, the power supply may not work
normally and protections may be triggered.
CAUTION

17
10. Faults and Trouble Shooting
10.1 OUP: Over Voltage Protection
This unit has a built-in tracking over voltage protection feature. In the event of
output voltage becoming greater than the set value (see specified range from
specifications table), protection will be triggered and the output power will be
cut off and OUP warning appears as below.
To reset the warning, switch off the unit and remove all loading. Switch the unit
back ON again and it should resume normal operation. If this problem persists,
please contact and consult with your agent.
There is a thermo sensor inside the unit to monitor and to prevent the unit to get
too hot inside. At OTP, there is no output and the following warning will appear
on the LED display. When you get this warning, switch off the unit and remove
all loading.
Check your load and output setting. Allow the unit to cool down for at least 30
minutes. Check if any of the ventilation is blocked, check enough clearance around
power supply. Listen carefully for the short wind noise from the cooling fan when
the unit is turned ON again. If you don't hear the self test wind noise,the fan is
faulty. Do not use the power supply and contact your agent.
10.2 OTP: Over Temperature Protection

18
Normally the overload protection is sustained by the CC constant current mode.
When the CC mode fails and goes undetected, it may cause serious damage to
your test piece or load. The OLP is meant to minimize the extent of damage to
your loads as power supplies do fail some day. Switch off your power supply as
soon as you see this warning as shown below.
10.3 OLP: Over Load Protection
To reset this warning, switch off the unit and remove all loading. Switch the unit
back ON again and double check with caution. If this problem cannot be fixed,
please contact and consult with your agent.

19
MODELS PSC-6916 PSC-6932 PSC-6960
Output
Variable Output Voltage 1 - 16VDC 1 - 32VDC 1 - 60VDC
Variable Output Current 0 - 60A 0 - 30A 0 - 15A
Voltage Regulation
Load (10-100% Load) 50mV
Line (108-132VAC Variation) 50mV
Current Regulation
Load (10-90% Rated Voltage) 200mA 150mA 100mA
Line (108-132VAC Variation) 50mA
Ripple & Noise
Ripple & Noise (r.m.s.) Voltage 5mV
Ripple & Noise (peak-peak)
Voltage
50mV 50mV 100mV
Current Ripple & Noise (r.m.s.) 100mA 40mA 15mA
Meter Type & Accuracy
Voltage Meter 3 Digit LED Display ±0.2% +3 counts
Current Meter 3 Digit LED Display ±0.2% +3 counts
Other
Input Voltage 120VAC / 60Hz
Full Load Input Current 9.6A 9.6A 9.5A
Efficiency 84.5% 87% 87.5%
Switching Frequency 65 - 85Khz~ 75 - 95Khz~ 65 - 85Khz~
Tracking Over Voltage Protec-
tions
O/P 1-5V: set voltage +2V
O/P 5-15V: set voltage +3V
O/P 1-5V: set voltage +2V
O/P 5-20V: set voltage +3V
O/P 20-30V: set voltage +4V
O/P 1-5V: set voltage +2V
O/P 5-20V: set voltage +3V
O/P 20-60V: set voltage +4V
Transient Response Time (50-
100%Load)
1.5ms
Power Factor Control Power factor correction >0.95 at optimal load
Cooling Method Thermostatic Control Fan from Zero to full speed
Protections Overload, Short Circuit by Constant Current, Output Tracking Over
Voltage, Over Temperature
Fuse T12A / 250V (5 x 20 mm)
Special Features 3 User defined VI preset, Remote control V, I and output on-off, Remote Sens-
ing (for PSC-6916 only)
Accessory User Manual, Application Software, USB cable
Dimensions (WxHxD) 200 x 90 x 275 mm 7.9 x 3.5 x 10.8 inch
Weight 3.2 kg 7 lbs
11. Specifications

20
12. PC Interface Control
A. Main Display
1. Display panel – use to display real-time information of power supply.
2. Main configuration and data log display panel – use to change general
setting of program and display data log.
3. Voltage and Current setting panel – use to set incident output value and
output On/Off.
4. Data handling panel – use to save, load and print data.
5. External Timed Program Description input space – use to enter description
of External Timed Program.
6. Program running cycle setting panel – use to set running cycle for External
Timed Program.
7. Information panel – use to display Maximum voltage/ current, Sampling
time, upper voltage/ current limit and software version.
The Main interface is divided into 7 panels.
Support OS: Windows XP/Vista/7 (32bits/64bits)
Driver: Silicon Lab CP210x USB driver
(Included in CDROM folder “USB CP210x Drivers V6.5 for Win_XP_
S2K3_Vista_7”)
Execute Program: run “<CDROM Drive>:\hcs\hcs.bat”