E-2
WELDER TROUBLESHOOTING
E-2
SA 250
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility
for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
Machine fails to hold the heat
consistently.
Welder starts but fails to generate
current.
Welding arc is loud and spatters
excessively.
Welding current too great or too
small compared to indication on
the dial.
Arc continuously pops out.
1. Rough or dirty commutator.
2. Brushes may be worn down
to limit.
3. Field circuit may have variable
resistance connection or intermit-
tent open circuit due to loose
connection or broken wire.
4. Electrode lead or work lead con-
nection may be poor.
5. Wrong grade of brushes may
have been installed on generator.
6. Field rheostat may be making
poor contact and overheating.
1. Generator or exciter brushes
may be loose or missing.
2. Exciter may not be operating.
3. Field circuit of generator or
exciter may be open.
4. Exciter may have lost excitation.
5. Series field and armature circuit
may be open-circuited.
1. Current setting may be to high.
2. Polarity may be wrong.
1. Exciter output low causing low
output compared to dial indication.
2. Operating speed too low or to
high.
1.
“
Current Range Selector
”
switch
may be set at an intermediate
position.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.
Summary of Contents for SHIELD-ARC SA-250
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