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– 18 –
TROUBLE
A. Machine fails to hold the “heat”
consistently.
B. Welder starts but fails to
generate current.
C. Welding arc is loud and
spatters excessively.
CAUSE
1. Rough or dirty commutator.
2. Brushes may be worn down to
limit.
3. Field circuit may have variable
resistance connection or
intermittent open circuit due to
loose connection or broken wire.
4. Electrode lead or work lead
connection 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 too high.
2. Polarity may be wrong.
WHATTODO
1. Commutator should be turned
or cleaned.
2. Replace brushes.
3. Check field current with ammeter
to discover varying current. This
applies to both the main
generator & the exciter.
4. Tighten all connections.
5. Use Lincoln brushes.
6. Inspect & clean the rheostat.
1. Be sure that all brushes bear on
the commutator and have proper
spring tension.
2. Check exciter output voltage
with voltmeter or lamp.
3. Check for open circuits in
rheostat, field leads and field
coils. Check rectifier bridge.
4. Flash fields.
(1)
5. Check circuit with ringer or
voltmeter.
1. Check setting and current output
with ammeter.
2. Check polarity. Try reversing
polarity or try an electrode of the
opposite polarity.
TROUBLESHOOTING
(1)
See FLASHING THE FIELDS on following page.