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TROUBLESHOOTING & REPAIR
F-7 F-7
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
No ouput. Main fuses open, indicat-
ing excessive current draw.
Inspect input leads for possible
shorts or grounds or misconnec-
tions.
Install new fuses and reapply power.
If fuses open again, go to next col-
umn of this Guide.
Inspect interior of machine for phys-
ical signs of electrical and heat dam-
age. Replace any damaged compo-
nents after conducting the tests
below:
1. See Input Rectifier test.
2. See Switch Board test.
3. See Capacitor Balance tests.
4. See Snubber Resistor test.
Machine does not produce more
than 250 amps on meter (while
welding) while connected to single-
phase supply
Normal operation.
Nothing is wrong.
No test necessary. The single-
phase operation is detected by the
Protection Board and the output cur-
rent is limited accordingly.
Machine operates okay at 230 VAC
or lower. No output at 380 VAC or
higher
Check input voltage and input volt-
age reconnect procedures. See
Installation section of this manual.
1. Check Re-connect Switches
2. See Protection Board Output
test.
3. See Capacitor Balance tests.
4. See Snubber Resistor test.
5. See Switch PC Board test.
Machine does not produce more
than 250 amps on meter (while
welding) when connected to
3-phase supply.
Check input voltages, fuses, and
input voltage reconnect procedures.
See Installation section of this man-
ual.
1. See Protection Board Output.
Voltage test.
2. See Control Board test.
3. See Input Rectifier test (com-
ponent D13).
V300-PRO
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.