Troubleshooting & repair, Caution – Lincoln Electric POWER-ARC 4000 SVM103-A User Manual
Page 50
POWER-ARC 4000
TROUBLESHOOTING & REPAIR
F-9
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
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
WELDING PROBLEMS
The welding arc is “cold.” The
engine runs normally (3700 RPM,
no load). Auxiliary power is func-
tioning normally.
1. Check for loose or faulty con-
nections at the weld output
terminals and welding cable
connections.
2. The welding cable may be too
long or coiled, causing an
excessive voltage drop.
1. Check for the correct open cir-
cuit voltage (OCV) at the welder
output terminals – 62 VAC is
normal.
If the correct voltage is present
at the output terminals, check
for loose connections on the
heavy current-carrying leads
inside the POWER-ARC 4000.
See the Wiring Diagram.
2. If the OCV is low at the welder
output terminals, perform
Engine Throttle Adjustment
Test.
3. Check for shorted or grounded
windings in the reactor (L1) and
also in the main stator.
See the Wiring Diagram.