Lincoln Electric SAE-400 SEVERE DUTY IM727, Руководство оператора

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E-3
TROUBLESHOOTING
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
PROBLEM POSSIBLE CAUSE RECOMMENDED COURSE OF ACTION
Welder runs but fails to
generate current. 1. Generator or exciter brushes may be loose
or missing.
1. Be sure that all brushes bear on the commutator and
have proper spring tension.
2. Exciter may not be operating. 2. Check exciter output voltage with voltmeter or lamp.
3. Field circuit of generator or exciter may be
open.
3. Check for open circuits in rheostat, field leads and
field coils. Also check resistors.
4. Polarity reversing switch may be in the
neutral position.
4. Put handle in positive or negative position.
5. Exciter may have lost excitation. 5. Check components and continuity in flashing circuit.
Welding arc is loud and
spatters excessively. 1. Series field circuit may be open circuited. 1. Check circuit with ringer or voltmeter.
2. Current setting may be too high. 2. Check setting and current output with ammeter.
3. Polarity may be wrong. 3. Check polarity. Try reversing polarity or try an
electrode of the opposite polarity.
Welding current too great or
too small compared to
indication on the dial. 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.
1. With current control against the minimum stop, set
pointer to within 1/8” of the last scale division.
2. Exciter output low causing low output
compared to dial indication.
2. Check for shorts in exciter armature with growler.
3. “Current Control” set to minimum and
welder output so great that engine stalls
when arc is struck.
3. Check to see that series field is properly connected
and not shorted.
Welder has output and no
control 1. Local/Remote switch is in wrong position. 1. Place switch in “LOCAL” position to control output at
the welder. Place switch in “REMOTE” position to
control output remotely.
No auxiliary power 1. Circuit Breakers open. 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.
2. Faulty connections to auxiliary receptacles. 2. Check connections.
3. If the GFCI tripped. (See Maintenence
Section).
3. Follow “GFCI Testing and Resetting Procedure” in the
MAINTENANCE section of this manual.