twintex TFC8000 Series User manual

Programmable AC Power Supply
TFC8000 Series
Operation Manual V1.0

0BSAFEFY INSTRUCTION.......................................................................................................................................II
1B1. KEY POINTS TO INSTALLATION ............................................................................................................- 1 -
6B1.1 Unpacking and Examination ................................................................................................................- 1 -
7B1.2 Preparation before Use..........................................................................................................................- 1 -
8B1.3 Storage and Shipping ............................................................................................................................- 2 -
2B2. SPECIFICATIONS .........................................................................................................................................- 3 -
9B2.1 Serial Lineup and Features...................................................................................................................- 3 -
10B2.2 Specifications..........................................................................................................................................- 4 -
3B3. OPERATION INSTRUCTIONS....................................................................................................................- 7 -
11B3.1 Front Panel Description........................................................................................................................- 7 -
12B3.2 Rear Panel Description..........................................................................................................................- 7 -
13B3.3 Operation Instructions..........................................................................................................................- 8 -
20B3.3.1 Power On...................................................................................................................................- 8 -
3.3.2 MENU .......................................................................................................................................- 8 -
21B3.3.3 Parameter Setup in Normal Mode..............................................................................................- 9 -
22B3.3.4 Parameter Setup in Programmable Mode ................................................................................- 11 -
23B3.3.5 System Setup and Operation....................................................................................................- 12 -
14B3.4. Protections...........................................................................................................................................- 14 -
15B3.5. Remote Control...................................................................................................................................- 14 -
3.6 Commands for RS232/GPIB Interface ..............................................................................................- 15 -
3.7 Programming Sample..........................................................................................................................- 15 -
4B4. FAULTS AND TROUBLE SHOOTING.....................................................................................................- 16 -
5B5. MAITENANCE .............................................................................................................................................- 17 -
17B5.1 Inspection .............................................................................................................................................- 17 -
18B5.2 Cleaning................................................................................................................................................- 17 -
19B5.3 Modification.........................................................................................................................................- 17 -

I
Use of Operation Manual
Please read through and understand this Operation Manual before operating the product. After
reading, always keep the manual nearby so that you may refer to it as needed. When mobbing the
product to another location, be sure to bring the manual as well.
Calibration notification
We notify that the instruments included in this manual are in compliance with the features and
specifications as stated in this manual. Before shipment, the instrument has been calibrated in
factory. The calibration procedures and standards are compliant to the national regulations and
standards for electronic calibration.
Warranty
We guarantee that the instrument has been passed strict quality check. We warrant our instrument’s
mainframe and accessories in materials within the warranty period of one year. We guarantee the
free replacement or repair of products which are approved defective. To get repair service, please
contact with your nearest sales and service office. We do not provide any other warranty items
except the one being provided by this summary and the warranty statement. The warranty items
include but not being subjected to the hinted guarantee items related to tradable characteristics and
any particular purpose. We will not take any responsibility in cases regarding to indirect, particular
and ensuing damage, such as modifications to the circuit and functions by the users, repairing or
component replacement by the users, or damage during transportation.
For product improvement, the specifications are subject to change without prior notice.

II
0BSAFEFY INSTRUCTION
This chapter contains important safety instructions that you must follow when operating the AC
power supply and when keeping it in storage. Read the following before any operation to insure
your safety and to keep the best condition for the instrument.
Safety Symbols
The following safety symbols may appear in this manual or on the instrument:
WARNING Identifies conditions or practices that could result in injury or loss of
life.
CAUTION Identifies conditions or practices that could result in damage to the
instrument or to other properties.
DANGER High voltage
ATTENTION Refer to the manual
Protective conductor terminal
Earth (ground) terminal
Safety Guidelines
CAUTION

Before plugging into local AC mains, check and make sure that the
output voltage is compatible to the load. (It is suggested to disconnect a
load before plugging into local AC mains.
Do not use this instrument near water.
Do not operate or touch this instrument with wet hands.
Do not open the casing of the instrument when it is connected to AC
mains.
Avoid touch the metal contact part of the output terminals.
Do not use the instrument in an atmosphere which contains sulfuric acid
mist or other substances which cause corrosion to metal.
Do not use the instrument in a dusty place or a highly humid place as
such will cause instrument reliability degradation and instrument
failures.
Install the instrument in a place where is free from vibration.

Install the instrument in a place where the ambient temperature is in
range of -20~60℃
. Note that the instrument operation may become
unstable if it is operated in an ambient temperature exceeding the range
of 0~40
℃
Power supply
WARNING
AC Input voltage: 220V (single phase) /380V (three phase) ±10%, 50/60Hz
Connect the protective grounding conductor of the AC power cord to an
earth ground to avoid electrical shock.
Fuse
WARNING
Make sure the correct type of fuse is installed before power up.
Replace the AC fuse with the same type and rating as the original fuse.
Disconnect the power cord before fuse replacement.
Make sure the cause of fuse blowout is fixed before fuse replacement.

- 1 -
1B1. KEY POINTS TO INSTALLATION
This chapter introduces the rules of product unpacking, examination, preparation of pre-use and
storage.
6B1.1 Unpacking and Examination
1. Unpack the AC power supply and check the enclosed accessories.
2. The product is sealed in a packing case which is protected by pear brocade. If there are any
damages with the packing case, please check the AC power supply and see if there is any
deformation, scratch or panel damaged.
3. In case of any damage, please inform us or local distributor immediately. Our service center will
maintain it or replace it with a new one. However, please do not return it without a notification
to us or local distributor.
Packing list:
AC power supply: 1 unit
Operation manual: 1 pcs
7B1.2 Preparation before Use
Input Power
The input power requirements of the instrument are 220V±10% (50Hz±10%) single phase AC or
380V±10% (50Hz±10%) three phase AC. Please use a proper input power before turn on the AC
power supply, and use a fuse with same specification of the original. The fuse specification is
indicated on the rear panel of the power supply.
WARNING
Disconnect the power cord before fuse replacement.
WARNING
Always keep good connection of the grounding wire and make sure to connect
the grounding wire to the earth. The 3-pin power plug of the power supply
must be connected to a socket with grounding wire. To use a longer wire,
make sure it is perfectly grounded to the earth. When the 3-pin power plug of
the power supply is plugged into a socket with grounding wire, the power
supply has been grounded to the earth.
Operation Environment
Location: The installation sites must be away from chemical deposition, explosive material, sulfuric
acid mist or other substances which cause corrosion to metal. The installation site shall always keep
lean and dry, and free from dusty, high humidity and vibration.
Relative Humidity: < 80%
Altitude: < 2000m
Temperature: 0 ℃to 40℃

- 2 -
8B1.3 Storage and Shipping
Environment
Location: The storage sites and transportation environment must be away from chemical deposition,
explosive material, sulfuric acid mist or other substances which cause corrosion to metal. The
installation site shall always keep lean and dry, and free from dusty, high humidity and vibration.
Relative Humidity: < 80%
Altitude: <7620m
Temperature: -20 ℃ to 55℃
The power supply must avoid extreme temperature change, because drastic temperature change will
cause vapor condensation inside the power supply.
Packing
Original Packing
Please keep all the original packing materials and pack the power supply if it must be sent back to
us for repairing. And contact our service center before returning. All the accessories included with
the power supply must be returned along with the power supply, and demonstrate the damage or
malfunction. In addition, please mark the package with a label indicating FRAGILE AND
HANDLE WITH CARE.
Other Packing
If the original packing materials are not found, please follow the following instructions to pack the
power supply:
1. Pack the power supply with bubble plastic bag or pearl brocade.
2. Put it into a multi-layer carton which can withstand a weight of 150kg.
3. Use shockproof materials to filled around the power supply with thickness of 70~100mm.
4. Seal the carton properly.
5. Marked the carton with a label indicating FRAGILE AND HANDLE WITH CARE.

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2B2. SPECIFICATIONS
9B2.1 Serial Lineup and Features
Main Features
Performance Adopts Direct Digital Synthesis (DDS) technology, good waveform, high
stability frequency, good continuity
Adopts half sine wave current and similar DC component waveform test,
high measuring accuracy
Embedded intelligent PC control system
Operation Full range adjustable output: 0~150V, 0~300V, step 0.1V
Output frequency 45~120Hz (40~500Hz optional), step 0.1Hz
Setting output current limit function
9 groups front panel setting save & recall
RS232 interface, GPIB interface (optional)
LCD display for RMS voltage & current, frequency, wattage, power
factor and AP
Numeric input for voltage, frequency, time and numbers

Simultaneous execution for 30 sets of voltage, frequency, rise time,
running time settings for continuous test up to 999999 cycles
Protection Over voltage, over current, over load, short circuit and current limit
protections
Interface
RS232 interface or GPIB interface (optional) for remote PC control
Applications
Automotive test system
Best power source for R&D
Electronic/electrical products test
Switching power supply and transformer test
Compressor and motor test, Monitor test
Air-conditioning equipments test
Fluorescent rectifier test
Factory use for QC, life test, etc.
400Hz switching power supply for military, airport and navigation systems,
supercomputer, etc.

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10B2.2 Specifications
1 Phase Output Linear Type
Model 8000L
8000LG
8001L
8001LG
8002L
8002LG
8003L
8003LG
8004L
8004LG
8005L
8005LG
Output capacity 500VA 1KVA 2KVA 3KVA 4KVA 5KVA
Operation mode Linear amplification
INPUT
Phase 1φ2W
Voltage 220V±10%
Frequency 47Hz – 63Hz
OUTPUT
Phase 1φ2W
Voltage 0-150VAC / 0-300VAC AUTO
Frequency 45~120Hz (40~500Hz optional) (0.1Step)
Max.curr
ent
L=120V 4.2A 8.4A 16.7A 25A 33.4A 42A
H=240V
2.1A
4.2A
8.4A
12.5A
16.7A
21A
LCD display Vrms, Arms, Fre, Wattage, PF, AP
Load Regulation 0.3%
T.H.D 0.3%
Frequency regulation 0.01%
Voltage resolution 0.1V
Frequency resolution 0.1Hz
Current resolution 0.001A 0.01A
On phase 0-359℃
Memory 9 sets
Programmable 30 sets
Interface RS232C or GPIB (optional)
Current limit setup O-Max Current
Protection Over Current, Over Temperature, Over Load and Short Circuit protections
Weight (Kg) 30 40 60 80 100 120
Dimension
W×H×D(mm)
430×178×540 430×445×550
Working
environment
0-40℃20-80%RH

- 5 -
1 Phase Output Switching Type
Model 8000 8001 8003 8005 8010 8015 8020 8030 8050 8100 8150
Power 500VA 1KVA 3KVA 5KVA 10KVA 15KVA 20KVA 30KVA 50KVA
100KV 150KV
Working SPWM
INPUT
Phase 1φ2W 3φ4W
Voltage 220V±10% 380V±10%
Frequency 47Hz - 63Hz
OUTPUT
Phase 1φ2W
Voltage 0-150VAC / 0-300VAC AUTO
Frequency 45~120Hz (40~500Hz optional) (0.1Step)
Max.curr
ent
L=120V 4.2A 8.4A 25A 42A 84A 125A 168A 250A 420A 840A 1250A
H=240V 2.1A 4.2A 12.5A 21A 42A 62.5A 84A 125A 210A 420A 625A
LCD d
isplay
Vrms, Arms, Fre, Wattage, PF, AP
Load regulation 1%
T.H.D 2%
Frequency regulation 0.01%
Voltage resolution 0.1V
Frequency resolution 0.1Hz
Current resolution 0.001A 0.01A 0.1A 1A
Memory 9 sets
Programmable 30 sets
Interface RS232C or GPIB (optional)
Current limit setup O-Max Current
Protection Over Current, Over Temperature, Over Load and Short Circuit protections
Weight (Kg) 15 20 30 50 80 120 150 250 400 600 800
Dimension
W×H×D(mm)
430×178×540 430×22
2×540
430×445
×550
430×667×550 610×930×1050 700×1200×1400
Working environment
0-40℃20-80%RH

- 6 -
3 Phase Output Switching Type
Model 8006T
8006TG
8009T
8009TG
8012T
8012TG
8015T
8015TG
8020T
8020TG
8030T
8030TG
8060T
8060TG
8100T
8100TG
8150T
8150TG
8300T
8300TG
8450T
8450TG
Power 6KVA 9KVA 12KVA 15KVA 20KVA 30KVA 60KVA 100KVA 150KVA 300KVA 450KVA
Operation mode SPWM
INPUT
Phase 1φ2W 3φ4W
Voltage 220V±10% 380V±10%
Frequency 47Hz - 63Hz
OUTPUT
Phase 3φ4W
Phase Voltage 0-150VAC / 0-300VAC AUTO
Frequency 45~120Hz (40~500Hz optional) (0.1Step)
Max.curr
ent
L=120V 16.8A 25A 33A 42A 56A 84A 168A 278A 420A 840A 1250A
H=240V 8.4A 12.5A 17A 21A 28A 42A 84A 139A 210A 420A 625A
LCD di
splay
Vrms, Arms, Fre, Wattage, PF, AP
Load regulation 1%
T.H.D 2%
Frequency regulation 0.01%
Voltage resolution 0.1V
Frequency resolution 0.1Hz
Current resolution 0.01A 0.1A 1A
Memory 9 sets
Programmable 30 sets
Interface RS232C or GPIB (optional)
Current limit setup O-Max Current
Protection Over Current, Over Temperature, Over Load and Short Circuit protections
Weight (Kg) 75 90 120 150 200 300 500 900 1200 2000 3000
Dimension
W×H×D(mm) 430×700×700 610×930×1050 700×1200×1400 900×1580×1610
1000×
1580×
1800
Working environment 0-40℃20-80%RH
For the purpose of product improvement, specifications are subject to change without prior notice.

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3B3. OPERATION INSTRUCTIONS
11B3.1 Front Panel Description
Fig.3-1 Front panel for 1 Phase Linear Type
1
Handler
2
LCD display: for parameter setup and monitoring operation status
3
Input keys
4
Input switch
12B3.2 Rear Panel Description
Fig.3-2 Rear panel for 1 Phase Linear Type

- 8 -
1
Handler
2
Cooling fan: temperature heat fan operation, please make sure of good ventilation
3
RS232 interface: for PC control
4
SYNC interface: output synchronization controlled signal (Positive inside, negative outside)
5
Input/output connecting bar (L N G, L N G)
6
Fuse holder with safe fuse inside
7
AC output socket
8
Cooling fan: temperature heat fan operation, please make sure of good ventilation
13B3.3 Operation Instructions
WARNING

Before connecting to local AC mains check and make sure to use
correct AC power to the power supply.
Connect the protective grounding conductor of the AC power cord to an
earth ground to avoid electrical shock.

Switch off all switches.
20B3.3.1 Power On
Before power on, please make sure that the input AC power source is in compliance with the
specified input power of the e unit. And all switches on the unit shall be at OFF position. Make
good connection to the connecting bar.
Press the POWER button to turn on the power supply, the LCD display will display model number
and version. And the CPU will recall the last panel settings, because the panel settings have been
memorized into the EEPROM each time after power off.
3.3.2 MENU
In standby mode, press MENU key to switch between NORMAL mode, PROGRAMMABLE mode
and SYSTEM setup. Please refer to the following:

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21B3.3.3 Parameter Setup in Normal Mode
1) Voltage Setup (Vset)
In standby mode, press key “︿” or “﹀” to go to voltage setup. To input a new voltage value , dial
the numeric key pad and press ENTER to confirm the new input. If there is wrong input, press key
“←” to clear the wrong values and make new input. Or, press key “<” or “>” to make direct
adjustment to the current numbers.
In output mode, voltage values can also be adjusted by pressing key “<” or “>” to make direct
adjustment to the current numbers.
In output mode, the low range voltage can be set at any value between 0V to 150V, and the high
range voltage can be set at any value between 0V to 300V. If the desired output voltage is over the
low range, first switch to high range and set the desired voltage.
2) Frequency Setup (Fset)
In standby mode or output mode, press key “︿” or “﹀” to go to frequency setup. To input a new
frequency value, dial the numeric key pad and press ENTER to confirm the new input. If there is
wrong input, press key “←” to clear the wrong values and make new input. Or, press key “<” or
“>” to make direct adjustment to the current numbers.
In output mode, frequency values can also be adjusted by pressing key “<” or “>” to make direct
adjustment to the current numbers.
The frequency can be set at any value between 45Hz to 120Hz. If the optional range 40~500Hz is
selected, the frequency can be set at any value between 40Hz to 500Hz.

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3) Output Key (ON)
When all parameters are correctly set, press key ON, the unit will make output.
4) OFF/PAUSE Key
To turn off the output, press key OFF/PAUSE. Press this key again; the output of the unit is paused.
If there are problems in output, the unit will make the output as OFF, and the LCD will display
“FAULT” on the upper right corner. At the same time, the beeper alarms. Press key OFF/PAUSE to
turn off the beeper alarm.
5) MEMORY Key
The power supply has 9 memory groups for panel setting save & recall – M1, M2…M9. The panel
setting can be stored to any one of the memory groups and be recalled from this memory group.
After finish panel setting, press the MEMORY key, the LCD displays “Save to M_”. Press number
1 or 2…9 to select a memory group for data storage.
To recall the stored panel setting, press the memory key M1, M2…M9 once, the LCD displays
“Load from M_”. Press number 1 or 2…9 to select a memory group for data recall.

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22B3.3.4 Parameter Setup in Programmable Mode
1) Data Group Setup (PG)
In standby mode, press key “︿” or “﹀” to go to PG setup. To input a new value, dial the numeric
key pad and press ENTER to confirm the new input. If there is wrong input, press key “←” to clear
the wrong values and make new input. Or, press key “<” or “>” to make direct adjustment to the
current numbers.
2) Voltage Setup (Vset)
In standby mode, press key “︿” or “﹀” to go to voltage setup. To input a new voltage value, dial
the numeric key pad and press ENTER to confirm the new input. If there is wrong input, press key
“←” to clear the wrong values and make new input. Or, press key “<” or “>” to make direct
adjustment to the current numbers.
In output mode, the low range voltage can be set at any value between 0V to 150V, and the high
range voltage can be set at any value between 0V to 300V. If the desired output voltage is over the
low range, first switch to high range and set the desired voltage.
3) Frequency Setup (Fset)
In standby mode, press key “︿” or “﹀” to go to frequency setup. To input a new voltage value,
dial the numeric key pad and press ENTER to confirm the new input. If there is wrong input, press
key “←” to clear the wrong values and make new input. Or, press key “<” or “>” to make direct
adjustment to the current numbers.

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The frequency can be set at any value between 45Hz to 120Hz. If the optional range 40~500Hz is
selected, the frequency can be set at any value between 40Hz to 500Hz.
4) Running Time Setup (TR)
In standby mode, press key “︿” or “﹀” to go to running time setup. To input a new voltage value,
dial the numeric key pad and press ENTER to confirm the new input. If there is wrong input, press
key “←” to clear the wrong values and make new input. Or, press key “<” or “>” to make direct
adjustment to the current numbers.
5) Delay Time Setup (TD)
In standby mode, press key “︿” or “﹀” to go to delay time setup. To input a new voltage value,
dial the numeric key pad and press ENTER to confirm the new input. If there is wrong input, press
key “←” to clear the wrong values and make new input. Or, press key “<” or “>” to make direct
adjustment to the current numbers.
6) Enable Data
In standby mode or output mode, press key “︿” or “﹀” to go to a data group. Press key “<” or “>”
to select “Enable” or “Disable” selected the data group.
Enable: to use the selected data group
Disable: to un-use the selected data group
7) Running Cycles Setup (LOOP)
In standby mode or output mode, press key “︿” or “﹀” to go to a loop setup to set the running
cycle numbers. To input the cycle numbers, dial numeric key pad and press ENTER key to confirm
the new input. If there is wrong input, press key “←” to clear the numbers and make new input.
23B3.3.5 System Setup and Operation
1) Voltage Range Setup (Vrange)
In standby mode, press key “︿” or “﹀” to go to voltage range setup. Press key “<” or “>” to make
range selection between H (High) and AUTO range.

- 13 -
In AUTO range, when the voltage goes from low range to high range, or from high range to low
range, the load will have an instant power off for 2-5 mS, which may have slight influence to some
precise tests. When in HIGH range, there will be no such influence.
2) Angle Setup (ANGLE) (Available only in TFC8000L/8000LG Series)
In standby mode, press key “︿” or “﹀” to go to angle setup. To input a new angle value, dial
numeric key pad and press key ENTER to confirm the new input. Or press key “<” or “>” to make
direct adjustment on the current value. If there is wrong input, press key “←” to clear thewrong
values and make new input.
3) Output Current Limit Setup (ILMT)
In standby mode, press key “︿” or “﹀” to go to output current limit setup. To input a new angle
value, dial numeric key pad and press key ENTER to confirm the new input. Or press key “<” or
“>” to make direct adjustment on the current value. If there is wrong input, press key “←” to clear
thewrong values and make new input.
During test, if the testing current is over ILMT, the output voltage will be shut off. The LCD
displays “FAULT” on the upper right corner and the beeper alarms. Press OFF/PAUSE key to turn
off the beeper alarm.
4) RS232 Baud Rate Setup (RS232 BPS)
In standby mode, press key “︿” or “﹀” to go to baud rate setup. Press key “<” or “>” to go to the
baud rate selection. Each press makes a new baud rate, which takes turns as: 4.8, 9.6, 19.2…….
When the AC power supply is equipped with GPIB interface, the GPIB baud rate (BPS) is set at a
fixed rate of 115.2.
5) Address Setup (ADDR)
In standby mode, press key “︿” or “﹀” to go to address setup. Press key “<” or “>” to select the
address. Each press makes a new address, which take turns as: 1, 2, 3, 4…….30.
6) GPIB Address Setup
In the RESET standby mode or output mode, press key “︿” or “﹀” to go to GPIB address setup.
Press key “<” or “>” to select the address. Each press makes a new parameter which take turns as: 1,
2, 3, 4…….30.

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14B3.4. Protections
The power supply has been designed with over voltage, over current, over load, short circuit and
current limit protections. In case of over voltage, over current, over load, short circuit or current
exceeding preset current limit, the protection circuits immediately start up and make protections. the
LCD will display “FAULT” on the upper right corner. At the same time, the beeper alarms.
In this situation, first turn off the output by pressing the POWER switch. Next check and clarify
reasons of alarming. For example, if there is over load, reduce load capacity and reset. Press RESET
key, the AC power supply can be operated again.
In case of over load or short circuit, do not press RESET key right after the alarm to reset the
settings, because this operation will have impact in the power supply machine life. The correct
operation is to turn off the output and press key RESET. Before restart the power supply, check and
make sure the load is in good condition.
15B3.5. Remote Control
RS232 interface is a standard part for TFC8000 series. A GPIB interface is also provided as an
optional part for users.
The RS232 interface is the most commonly used interface for instruments. Its hardware is a D type
9-pin connector. The pin definition is as below:
2 – TXD 3 – RXD 5 – GND
1
6
2
7
3
8
4
9
5
1
6
2
7
3
8
4
9
5
TXD
RXD
GND
TXD
RXD
GND
AC POWER SUPPLY COMPUTER

- 15 -
3.6 Commands for RS232/GPIB Interface
1. A command with question mark”?” is to read the equipment. When the command is correctly
executed, there is returned string.
2. A command without question mark “?” is to write to the equipment. When the command is
correctly executed, there is no returned string. When the command is not correctly executed, it
returns reason of fail.
Command
Returned massage or data
Unit
Description
?FR
45.0~500.0
Hz
Read frequency
?VO
0.0~300.0
V
Read voltage (RMS)
?AM
0.000~I(MAX)
A
Read current (RMS)
?PA
0.0~
A
Read current (PEAK)
?PW
0.0~P(MAX)
W
Read power
?PF
0.000~1.000
Read power factor
ON
Start output
OFF
Stop output
VOX
X=0.0~300.0
V
Voltage setup
FR X
X = 45.0~500.0
Hz
Frequency setup
FR X
X = 45.0~500.0
Hz
Frequency setup
RANGX
X=LOW
X=HIGH
X=AUTO
Voltage range setup
ANGX
X=0~359
Degree
Angle setup
3.7 Programming Sample
Note: words in bold is remarks to commands.
har cmd[100];
char respond[100];
DWORD Id,SN;
Id = PARWA_ID(8); // set ID=8
if (!PARWA_Open("COM1",19200,&SN)) // Use port 1, Baud rate: 19200, SN: power
supply serial number
{
return false;
};
sprintf(cmd, "FR 60.0"); // set frequency at 60.0Hz

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PARWA_Command(cmd, respond);
PARWA_Command("VSA 220.0", respond); // auto range 220V
PARWA_Command("ON", respond); // running
Sleep(200);
sprintf(cmd, "?FR"); // read frequency
if (PARWA_Command(cmd, respond))
{
Freq->Text = respond;
};
if (PARWA_Command("?VO", respond))
{
Voltage->Text = respond; // read voltage
};
Sleep(20000);
sprintf(cmd, "OFF");// stop output
PARWA_Command(cmd, respond);
PARWA_Close();
4B4. FAULTS AND TROUBLE SHOOTING
Fault
No output, all panel indicators are out
Causes
No power supply input
Clear a) Check if the power switch is turned on.
b) Check if the fuse is blowout
c) Check if the power supply is correctly plugged to local AC mains, or if electricity is
out.
Fault
No voltage output, frequency meter is good, voltmeter displays “0’ and beeper alarms
Causes Over load or abnormal load
Load with over starting current
Clear
Turn off the POWER switch, press key RESET to reset the setting. Reduce load capacity.
Fault
Remote control port failure
Causes a) The remote control address, baud rate are different from the settings on the PC
b) Connector or wire problem. In this case, disconnect the instrument from the PC
c) L oose contact or jamming.
Clear
a) Make the remote control address and baud rate the same on the PC and the
instrument.