Lincoln Electric SAE-300 HE Service Manual page 19

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
There is no or very low weld
output. Auxiliary output is
normal.
There is no auxiliary voltage at
receptacles but weld output is
normal.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the
Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Check that the remote/local
switch is positioned correctly.
2. If a remote current control is
being used, try switching to
local control. The remote
current control may be faulty.
3. Check all leads and cables
for damaged or poor
connections.
1. Check that the auxiliary
power circuit breakers are not
tripped.
2. If the machine is equipped
with a ground fault circuit
interrupter (GFCI), it may be
tripped or defective.
NOTE: GFCIs will not reliably
reset, unless engine is
operating at high idle RPM.
3. Check all leads and cables
for damaged or poor
connections.
SAE-300® HE Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Perform the Shunt Field Coil
Resistance And Ground Test
Procedure.
2. Perform the Shunt Field
Circuit Voltage Test Procedure.
3. Perform the Welding
Generator Brush And
Commutator Inspection And
Service Procedure.
4. Check for damaged or poor
connections at the brush
holders, series and interpole
coils, coarse current control
unit, weld output terminals and
all the conductors connecting
these components.
5. Perform the Weld Circuit
Ground And Short Circuit Test
Procedure.
6. The armature may be faulty.
1. Check for auxiliary voltage at
the receptacle input terminals;
if normal voltage is present,
replace terminals.
2. Check for auxiliary voltage at
the connections closest to the
exciter stator windings. See
Wiring Diagram.
• If normal voltage is present,
check the wiring and circuit
breakers between the test
points and the receptacle.
Repair or replace any defective
parts or wiring.
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