Lincoln Electric POWER-ARC 4000 SVM103-A Service Manual page 50

F-9
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The welding arc is "cold."
engine runs normally (3700 RPM,
no load). Auxiliary power is func-
tioning normally.
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.
POWER-ARC 4000
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELDING PROBLEMS
The 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.
CAUTION
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
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,
Engine Throttle Adjustment
Test.
3. Check for shorted or grounded
windings in the reactor (L1) and
also in the main
See the Wiring Diagram.
perform
stator.