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TROUBLESHOOTING & REPAIR
F-11 F-11
INVERTEC STT
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed.
Call
1-888-935-3877
.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
Molten weld puddle appears exces-
sively "violent."
1. The Wire Type switch may be in
the wrong position for the elec-
trode wire being used.
2. The Peak Current or Back-
ground Setting may be too high.
Adjust for optimum welding per-
formance.
3. The Tailout may not be set cor-
rectly for the process. (STT II
Only)
1. The IGBT module may be faulty.
Check or replace.
2. The IGBT driver PC board may
be faulty.
3. The control PC board may be
faulty.