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TROUBLESHOOTING & REPAIR
F-12 F-12
INVERTEC STT
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
WELDING PROBLEMS
Excessive weld spatter. Arc
sounds and looks like a standard
MIG process.
1. Check the Arc Sense leads for
loose or faulty connections.
2. Make sure the Arc Sense
"WORK" lead is as close as
possible to the welding arc.
3. Make sure the machine and
wire feed settings are correct for
the process and wire being
used.
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.
Poor welding, weld settings drift, or
output power is low.
1. Make sure the machine settings
are correct for the welding
process being used.
2. Check the welding cables for
loose or faulty connections.
3. Make sure the reconnect switch
S7 is in the correct position for
the three-phase input voltage
being applied.
Do not switch reconnect switch with
input power applied to machine.
1. The current sensor may be
faulty. Check associated leads
for loose or faulty connections.
2. The control PC board may be
faulty.
CAUTION