Lincoln Electric IM949 SAE400 - Manual (Page 26)

E-3 TROUBLESHOOTING E-3
SAE-400
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
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Welder runs but fails to generate
current.
Welding arc is loud and spatters
excessively.
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.
1. Series field circuit may be open
circuited.
2. Current setting may be too high.
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 rheo-
stat, field leads and field coils.
Also check resistors.
4. Check components and continuity
in flashing circuit.
1. Check circuit with ringer or volt-
meter.
2. Check setting and current output
with ammeter.