7
Fault
Resolution
Power indicator lit
Fan not running and no
Welding input
A. Ensure power is turned off.
B. Ensure power is connected properly.
C. Heat sensor resistance incorrect or faulty. (24V relay has a fault)
D. Power source board (Board has problem, no DC537V output voltage.)
i. Silicon bridge circuit faulty or cable is loose.
ii. Part of the circuit board burnt.
iii. Check cable between switch and power source board. Power board between
MOS board.
iv. Sub power source on control board faulty. Contact distributor or
manufacturer.
Fan running and Fault
indicator lit.
No output power.
A. Check all components are correctly connected.
B. Check if the output terminal has a broken circuit and poor connection.
C. Inverter circuit faulty;
1. If Fault indicator lit: MOS board faulty, check and replace.
2. If Fault indicator not lit:
i. Transformer on Middle Board faulty, measure primary inductance volume
and Q volume of main transformer by inductance bridge.
Primary volume of parallel circuit, L=1.2-2.0MH, Q>40 if inductance volume
and Q volume is low, replace it.
ii. Check the secondary rectifier tube on the transformer. If faulty replace.
iii. Feedback circuit in fault.
Power indicator not lit,
fan not running and no
welding output.
A.) Make sure the power switch is turned off.
B.) Make sure power supply and all cables are securely connected and power
supply is working.
Power indicator lit, fan
not running and no weld-
ing output.
A. Connected to incorrect power source has enabled machine protection circuit,
connect to correct power supply and check machine for operation.
B. Input power not stable (input cable too small) or input cable incorrectly
connected to power supply has caused protective circuit to be enabled. Check
connections and turn off the machine for 5-10minutes. Turn the machine on and
check for operation.
C. Turning the machine power switch ON and OFF too quickly has enabled the
protection circuit. Turn the machine off for 5-10 minutes. Turn on and check for
operation.
D. Power supply cables/plugs are loose. Turn Machine off and Check for proper
connection of all power supply cables/plugs and check for operation.
Fixes and Faults
TROUBLESHOOTING