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10. TROUBLESHOOTING & SERVICE
The following operations require the operator should have sufficient electrical
expertise and comprehensive safety knowledge, the operator should hold valid
qualifications to demonstrate his capacity and knowledge. Make sure power input
cable has been disconnected before opening the machine cover.
Common faults and exclusion method:
Symptom
Solution
Power indicator does
not light, fan does not
rotate, no welding
output
1
、
Make sure the power switch is turned on.
2
、
Check to confirm that the power input cable is connected well with
the grid.
The fan rotates, alarm
indicator does not
light, no HF electric
discharge, touch
striking arc is OK.
1
、
Check all connectors inside the machine whether there is problem;
check whether the welding torch’s control cable is break.
2
、
It may be caused by circuit defect, check the reason and contact
with the after-service.
Alarm indicator does
not light, have high
frequency, no welding
output.
1
、
Welding torch’s cable is break. Earth cable breaks or has not been
connected with the work piece.
2
、
The connections between the positive output terminal or welding
torch output terminal with the inside part of the machine are loose.
Alarm indicator does
not light, no high
frequency, touch
striking arc is OK.
1
、
The connection between the primary coil of arc starting
transformer and the power panel is bad, should re-connect them.
2
、
The input cable from power switch to power panel AC220V drops
off.
3
、
Some components of the high voltage electric starting arc circuit
are damaged, find them out and change them with the new ones.
Alarm indicator lights,
no output.
1
、
It is may because of over current protection, turn off the machine.
Restart the machine after the alarm indicator is off and it should be
normal.
2
、
Also may because of overheat protection, no need to turn off the
machine but just wait for 2~3 minutes, then it may come normal. If the
alarm indicator does not light, it may be caused by control PCB power
short-circuit or damage.
Power indicator is
flashing, alarm
indicator does not
light, no output.
Input over voltage or short voltage, check the input power.
When the machine is turn on, there is welding output load,
thermistance block the input power supply. Turn off the machine and
wait for several seconds then turn on the machine without load.
Input current is
unstable or not
controlled by the
potentiometer.
If it is because of the potentiometer damage, replace the
potentiometer. Or if it caused by the bad connections, especially
socket connector, need inspection.
