Lincoln Electric RANGER SVM120-A Service Manual page 59

F-5
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
No weld output, the auxiliary
power (230-115VAC) is operating
normally. Engine operates normal-
ly.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. If the Polarity mode switch (S1)
is in a constant voltage (CV)
position, make sure the CV out-
put contactor is activating.
2. With the Polarity mode switch
(S1) is in a constant current
(CC) position, check the open
circuit voltage at the welder
output terminals. Normal AC is
70 to 76VAC. Normal DC is 61
to 68VDC. If the OCV is OK,
proceed to Step #2., If the OCV
is NOT present at the welder
output terminals, contact your
local Lincoln Authorized Field
Service Facility.
3. Check the welding cables,
clamps, and electrode holder
for loose or broken connec-
tions.
CAUTION
RANGER 10-LX
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. If OCV is present in the CC
mode but NOT in the CV mode,
check the CV output contactor
and also the Polarity mode
switch (S1).
2. If OCV is absent in both modes
(CV and CC), disconnect lead
W1 from the output bridge (D1).
With the engine at high idle and
the output control at maximum,
check for 70 to 76VAC from
lead W1 to lead W2 on the main
transformer. See
Diagram. If the AC voltage is
NOT present, the winding may
be faulty. Check the winding for
continuity and test to be sure it
is NOT grounded to the stator
iron. Replace if necessary. If
the correct voltage is present,
proceed to step #3.
3. Check the reactor,
switch (S2), and associated
wires for loose or faulty connec-
tions. Check the reactor wind-
ing for continuity and test to be
sure it is NOT grounded to the
reactor iron.
4. Check the choke (L1), Polarity
mode switch (S1), and associ-
ated wires for loose or faulty
connections. Check the choke
winding for continuity and test
to be sure it is NOT grounded to
the choke iron.
5. Check the weld output termi-
nals and associated wires for
loose or faulty connections.
6. Perform the Output Rectifier
Bridge Test.
F-5
Wiring
Range