Troubleshooting & repair, Caution – Lincoln Electric CLASSIC III SVM 137-A User Manual
Page 67
TROUBLESHOOTING & REPAIR
F-7
F-7
Classic III and IIID
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, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-
383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The engine starts and runs at the
correct speed, but there is no AC
auxiliary output voltage. The DC
welding generator is functioning
correctly.
1. Check the AC auxiliary output
circuit breakers.
Reset if
tripped.
2. Check the 115VAC and 230VAC
receptacles and plugs for loose
or faulty connections.
1. Check for loose or faulty con-
nections between the recepta-
cles, the circuit breakers, the
current transformer and the
exciter alternator stator.
See
the Wiring Diagram.
2. Check the 115VAC and 230VAC
windings in the alternator stator
for shorted turns or grounds.
Check the continuity of the
windings.
See the Wiring
Diagram.
The engine starts and runs normal-
ly. The machine takes a long time
to “build-up” and produce output
voltage. The AC auxiliary voltage
varies when the Fine Current
Control rheostat is adjusted.
1. Contact your local Authorized
Field Service Facility.
1. Check the “flashing” diode locat-
ed on the DC generator brush
holder.
The diode may be
“shorted” or installed incorrectly.