Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 81

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TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Machine often "noodle welds" with
a particular procedure.
Erratic output or greater than 6
amps reading on display with no
output.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELDING PROBLEMS
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
CAUTION
POWER WAVE 450
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
If problem occurs all the time -
change the control board.
Replace shunt and lead assembly.
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