Lincoln Electric RANGER 9 SVM 110-A Service Manual page 60

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.
RANGER 9
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. With the WELDING TERMINAL
switch in the "ALWAYS ON"
position, check the open circuit
voltage (OCV) at the welder out-
put terminals.
mum is 73 to 80VAC. Normal
DC maximum is 65 to 75VDC.
If the OCV is OK, then proceed
to Step #2. If the OCV is NOT
present at the welder output
terminals, contact your local
Lincoln Authorized
Service Facility.
2. Check the welding cables,
clamps, and electrode holder
for loose or broken connec-
tions.
CAUTION
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Make sure the output contactor
is being activated. Also make
sure there is continuity (zero
ohms) through the contactor
Normal maxi- contacts.
2. Disconnect lead W1 from the
output bridge (D1) and check
for the presence of 80VAC from
lead W1 to lead W2 on the main
stator. See Wiring Diagram. If
the AC voltage is NOT present,
Field
the winding in the stator 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 AC voltage is pre-
sent, proceed to step #3.
3. Check
Switch (S2), and associated
wiring for loose or faulty con-
nections.
winding for continuity and test
to be sure it is NOT grounded to
the reactor iron.
4. Check the choke (L1), Polarity
Switch (S1), and associated
wires for loose or faulty connec-
tions. 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
Observe Safety Guidelines
the reactor, Range
Check the reactor
RANGER 9