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TROUBLESHOOTING & REPAIR
F-21 F-21
POWER WAVE 450
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-
800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
Machine often “noodle welds” with
a particular procedure.
Erratic output or greater than 6
amps reading on display with no
output.
1. The machine may be trying to
deliver too much power. When
the average output current
exceeds a maximum limit, the
peak current is drastically cut
back. Lower the welding para-
meter settings and/or increase
the stickout length to eliminate
this problem.
Power Wave 450 – When the
average output current exceeds
540 amps, the peak output cur-
rent is folded back to 100 amps.
None
If problem occurs all the time -
change the control board.
Replace shunt and lead assembly.