Lincoln Electric INVERTEC V275-S Service Manual page 39

F-9
Observe Safety Guidelines
detailed in the beginning of this manual.
WELDING PROBLEMS
(SYMPTOMS)
Poor stick electrode welding per-
formance. The arc pops out.
For no apparent reason the welding
characteristics have changed.
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)
WELDING PROBLEMS
1. Make sure the Arc Force Control
is set properly for the process.
See the Operation Section.
2. Check for loose or faulty weld-
ing cables.
3. Is the electrode Dry? Try weld-
ing with another electrode from
a different container. Make sure
you have the correct electrode
for the application.
4. Make sure the machine's setting
are correct for the process
being used.
1. Check the welding cables for
loose or faulty connections.
2. Make sure the machine's mode
and output are set correctly for
the process being used. (CC or
TIG)
3. If in the TIG mode make sure
the shielding gas is correct for
the process.
CAUTION
V275-S
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Check the Mode switch for
proper operation. Also check
the associated leads for loose
or faulty connections. See the
wiring diagram.
2. The control board may be
faulty. Perform the Control
Board Test.
3. Check the resistance of the pri-
mary current transducers.
Normal resistance is less than 1
ohm. See the wiring diagram.
1. Perform the Output Current
Shunt Test.
2. Perform the Output Diode
Module Test.
3. The Arc Force Potentiometer or
associated circuitry may be
faulty. Normal potentiometer
resistance is 10K ohms.
the wiring diagram.
4. The Hot Start switch may be
defective. See the wiring dia-
gram.
5. The Output Bypass Assembly
may be defective.
F-9
See