Lincoln Electric SAE-300 HE, Service Manual, Page: 19 / 84

LINCOLN ELECTRIC SAE-300® HE Service Manual
14
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
There is no or very low weld
output. Auxiliary output is
normal.
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. 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.
There is no auxiliary voltage at
receptacles but weld output is
normal.
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.
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.
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.