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F-8 F-8
INVERTEC STT
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE Observe Safety Guidelines
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
OUTPUT PROBLEMS
Machine loses output while weld-
ing. The thermal indicator light is
lit. Normal welding output returns
after about 10 minutes.
1. Check to make sure the fan is
running and operating correctly.
2. Welding application may
exceed recommended duty
cycle.
3. Dirt and dust may have clogged
the cooling channels. Blow out
the unit with clean, dry com-
pressed air.
4. Air intake and exhaust louvers
may be blocked due to inade-
quate clearance around the
machine.
1. The IGBT heat sink thermostat
or fan thermostat may be defec-
tive. Check or replace.