Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual page 37

F-7
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
No ouput. Main fuses open, indicat-
ing excessive current draw.
Machine does not produce more
than 250 amps on meter (while
welding) when connected to
3-phase supply.
Machine does not produce more
than 250 amps on meter (while
welding) while connected to single-
phase supply
Machine operates okay at 230 VAC
or lower. No output at 380 VAC or
higher
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FEEDING PROBLEMS
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.
Check input voltages, fuses, and
input voltage reconnect procedures.
See Installation section of this man-
ual.
Normal operation.
Nothing is wrong.
Check input voltage and input volt-
age reconnect procedures. See
Installation section of this manual.
CAUTION
V300-PRO
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
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.
1. See Protection Board Output.
Voltage test.
2. See Control Board test.
3. See Input Rectifier test (com-
ponent D13).
No test necessary. The single-
phase operation is detected by the
Protection Board and the output cur-
rent is limited accordingly.
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.
F-7