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
OUTPUT PROBLEMS
The input fuses repeatedly fail or
the input circuit breakers keep trip-
ping.
1. Make certain the fuses or break-
ers are properly sized.
2.
Make certain the reconnect
panel is configured properly for
the applied voltage.
3. The welding procedure may be
drawing too much input current
or the duty cycle may be too
high. Reduce the welding cur-
rent and /or reduce the duty
cycle.
1. Check the reconnect switches
and associated wiring. See the
Wiring Diagram.
2. Perform the
Input Rectifier
Test.
3. Perform the
Switch Board
Test.
4. Perform the
Input Contactor
Test.
F-4
F-4
TROUBLESHOOTING & REPAIR
POWER WAVE 455M/MSTT
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