Lincoln Electric COMMANDER SVM153-A Service Manual page 58

F-5
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
No welding output in neither Stick
or CV modes. Also no auxiliary
power. The engine operates nor-
mally.
No auxiliary power at the recepta-
cles. The welding output is normal
and the engine operates normally.
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
1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Check the brushes for wear and
proper contact to the rotor slip
rings.
2. Make sure the engine is operat-
ing at the correct high idle
speed (1900RPM).
3. Check for loose or faulty con-
nections or leads on the auxil-
iary power studs in the control
box. See the Wiring Diagram.
1. The circuit breakers may be
tripped. Reset if necessary.
2. Check for loose or faulty con-
nections at the auxiliary recep-
tacles.
CAUTION
COMMANDER 500
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Perform the Rotor Resistance
Test.
2. Perform the Flashing and
Rotor Voltage Test.
"flashing" voltage is not present
the Battery PC board or leads
#201 or #200 may be faulty.
See the Wiring Diagram. Also
make sure that lead #5P has
continuity (zero
ground.
3. Check the field diode bridge and
capacitor. Replace if necessary.
4. Perform the Stator Voltage
Test.
5. See the Start-Up and OCV
Diagnostic Chart.
1. Check the wiring between the
auxiliary receptacles, the con-
nection studs in the control box,
and the main stator. See the
Wiring Diagram.
2. Perform the Stator Voltage
Test.
F-5
If the
ohms) to