Lincoln Electric SAE-400 Operator's Manual page 24

SAE-400
®
PROBLEM
Welder runs 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.
Welder has output and no
control
No auxiliary power
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.
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE CAUSE
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. Polarity reversing switch may be in the
neutral position.
5. Exciter may have lost excitation.
1. Series field circuit may be open circuited.
2. Current setting may be too high.
3. Polarity may be wrong.
1. "Current Control" shaft and handle may
have turned slightly in the insulated
bushing of the current control brush
holder, caused by turning handle too hard
against one of the stops.
2. Exciter output low causing low output
compared to dial indication.
3. "Current Control" set to minimum and
welder output so great that engine stalls
when arc is struck.
1. Local/Remote switch is in wrong position.
1. Circuit Breakers open.
2. Faulty connections to auxiliary receptacles. 2. Check connections.
3. If the GFCI tripped. (See Maintenence
Section).
CAUTION
RECOMMENDED COURSE OF ACTION
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. Also check resistors.
4. Put handle in positive or negative position.
5. Check components and continuity in flashing circuit.
1. Check circuit with ringer or voltmeter.
2. Check setting and current output with ammeter.
3. Check polarity. Try reversing polarity or try an
electrode of the opposite polarity.
1. With current control against the minimum stop, set
pointer to within 1/8" of the last scale division.
2. Check for shorts in exciter armature with growler.
3. Check to see that series field is properly connected
and not shorted.
1. Place switch in "LOCAL" position to control output at
the welder. Place switch in "REMOTE" position to
control output remotely.
1. Check and reset breakers. If breakers keep tripping
check connections to auxiliary receptacles. Also
make sure load does nor exceed receptacle's current
rating.
3. Follow "GFCI Testing and Resetting Procedure" in the
MAINTENANCE section of this manual.
E-3
TROUBLESHOOTING