6
Trouble Shooting and Fault Finding
Power indicator is
not lit, fan does not
work and no welding
output
➢ Power switch is damaged.
➢ Make sure the electric wire net connecting to input cable is working
alright
➢ Make sure if input cable has broken circuit.
Power indicator is lit,
fan does not work or
revolve several
circles and stopped,
no welding output
➢ Input cable is possibly connected to 380V power, which causes over
voltage protection circuit is starting. Connect input cable to 220V power,
and then restart the machine.
➢ Erratic 220V power supply (input cable is too thin and long) or input
cable is connected to electricity network would start overload voltage
protection circuit. Increase section of input cable or tighten input contact.
Turn off machine for 2-3 min and restart it.
➢ Cable that connects switch and power board is loosed, tighten it again.
➢ Turn on and off power switch continuously would start overload voltage
protection circuit. Turn off machine for 2-3 min and restart it.
➢ 24V relay of main return circuit on power board is not closed or
damaged, check 24V power and relay. Replace it with same model
series if it’s damaged.
Fan is working,
abnormal indicator is
not lit, sound of HF
arc striking cannot
be heard, wiping arc
welding can not
strike arc.
➢ Measure voltage of positive and negative electrode from power board to
VH-07 insert of MOS board by multimeter, which should reads DC 308V.
a) If circuit is broken and silicon bridge is poor contact.
b) If some of four high electrolytic (about 470UF/450V) of power panel
capacitor is leaking.
➢ There is a green indicator for auxiliary power on MOS board, if it’s not lit,
auxiliary power is out of work, check fault spot and contact with dealer.
➢ Check if all kinds of connect and insert cable is poor contact.
➢ Check if there is some problem in control circuit, contact with dealer.
➢ Check if control cable of torch is broken.
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