EN
INVERTER WELDING MACHINE
USER’S MANUAL
17
Troubleshooting
Fault symptom
Remedy
Fan is working and abnormal
indicator is lit, no welding
output.
A. Overload current protection may start, please turn off machine first,
then restart it after abnormal indicator is off.
B. Overheat protection may start, it will become normal in 2–3min
C. Inverter circuit may go wrong. Please disconnect the power supply
plug of the main transformer on MOS board (near fan VH-07), then
restart the machine.
a) If abnormal indicator is still lit, that means some fieldistors on MOS
board are damaged, check and replace it.
b) If abnormal indicator is off:
1) Maybe transformer of middle board is damaged, measure
primary inductance value and Q value of main transformer by
inductance bridge.
2) Primary value is parallel circuit, L=1.2–2.0mH, Q>40 If
inductance value and Q value is low, replace it.
3) Maybe some of secondary rectifier tube of transformer is
broken, check and replace rectifier tube.
D. Maybe feedback circuit is in fault.
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