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Chapter 5 Fault diagnosis
5.1 Summarize
Before repairing, you must cut the main switch or breaker.
。
If the machine can’t work normally, use following information, you can find the reason.
Check trouble and collate symptom, as table 5-1.If the problem can’t be found at once, you
should open the power to see ass parts and wire.
Electric repairing must be made by career man.
Table5-1 Diagnose and remove
TROUBLE REASON
SHOOTING
Welder dose
not function
when
switched on
1. No power at receptacle
2. Broken or damaged power
cable
3. Tripped thermal protection
device
1. Check circuit fuse or circuit breaker
2. Power cable requires service
3. After cooling then try to continue
Wire does not
feed properly
1. Insufficient wire feed
pressure
2. Wing nut is too loose
1. Increase wire feed pressure properly
2. Tighten wing nut
Welding arc
not stable
1. Heavy loads making power
line voltage low
2. Work piece not properly
grounded
3. Incorrect wire feed speed
1. Run welder on rated line voltage
2. Verify proper grounding. (No paint,
varnish or corrosion)Replace by career.
3. Adjust wire feed speed to achieve a more
stable arc
The weld is
like sponge
1. Empty gas cylinder.
2. Regulator or cylinder valve
closed.
3. Nozzle plugged.
4. Gas line blocked.
1. Check gas cylinder
2. Make sure both valves are adjusted
properly
3. Clean nozzle, if damaged, replace.
4. Check external hose, and hose within
Torch cable.
When
Pressing
switch the
machine can
not working
1. Control wire broke off
2. Circuit board damaged.
1. Check by career
2. Have a qualified technician check or
replace
Warning
Warning
