C-4
TROUBLESHOOTING
C-4
DURAWELD
TM
350/500
PROBLEMS
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
(SYMPTOMS)
COURSE OF ACTION
OUTPUT PROBLEMS
Meter reading is incorrect.
1. PC board is faulty.
Check and replace.
2. Loose or bad connections on the
feedback leads 220& 221, 222& 223.
Check and correct.
3. Loose or faulty connections at the
shunt.
Reconnect.
4. Display is faulty.
Replace.
Machine will NOT shut off.
1. Contactor is faulty.
Repair.
Contact your local Lincoln Authorized
Field Service Facility.
Welding arc is variable and
sluggish.
1. The welding cable connections
are loose or faulty.
Check and reconnect.
2. Make sure the wire feed speed,
voltage, and shielding gas are correct
for the process being used.
Check and correct.
3. The PC board is faulty.
Replace.
4. Bad connection of the input cable.
Check and correct.
Arc starts are poor.
1. Bad grounding connection.
Check and reconnect.
2. There is oil on the surface of the
workpiece.
Check and replace.
3. Output voltage is abnormal.
Check whether the open circuit
voltage is normal.
4. The welding parameters are not
correct, the WFS is too fast, the voltage
is low.
Readjust the welding parameters.