Troubleshooting & repair, Caution – Lincoln Electric COMMANDER SVM153-A User Manual

Page 58

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TROUBLESHOOTING GUIDE

Observe Safety Guidelines

detailed in the beginning of this manual.

CAUTION

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.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

OUTPUT PROBLEMS

No welding output in neither Stick
or CV modes. Also no auxiliary
power. The engine operates nor-
mally.

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. Perform the Rotor Resistance

Test.

2. Perform the Flashing and

Rotor Voltage Test.

If the

"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 ohms) to
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.

No auxiliary power at the recepta-
cles. The welding output is normal
and the engine operates normally.

1. The circuit breakers may be

tripped. Reset if necessary.

2. Check for loose or faulty con-

nections at the auxiliary recep-
tacles.

1. Check the wiring between the