Lincoln Electric IDEALARC DC-1500 Service Manual page 43

F-9
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Machine shuts off (input contac-
tor drops out) when the welder
output terminals are electrically
energized. (#2 to #4 closure at
terminal strip.)
The DC-1500 will NOT shut off
when the Stop button is pushed.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Remove all welding cables
and control cables from the
DC-1500. Jumper #2 to #4 at
the terminal strip. If the
machine does NOT shut off
and normal open circuit volt-
age is present at the welder
output terminals, the problem
is external to the DC-1500.
Either the remote leads #73,
#74, #75, #76 or #77 are
grounded to the negative out-
put cable, or there is a short
on the welding output termi-
nals.
2. If the machine still shuts off
when all control and welding
cables are removed, then the
problem is internal to the DC-
1000.
1. Input contact frozen.
2. Pilot relay contacts stuck
closed.
CAUTION
IDEALARC® DC-1500
RECOMMENDED
COURSE OF ACTION
1. Check for grounds and or
shorts in the #73, #74, #75,
#76, #77 circuit. See wiring
diagram.
2. Check for grounds and
shorts in the welder output
terminals and associated
leads. See wiring diagram.
3. Check the output shunt and
associated leads.
wiring diagram.
4. Perform the Control Board
Test.
1. The input contactor (1CR)
contacts may be stuck closed.
Check and replace if neces-
sary.
2. The Interlock contacts (part of
1CR) may be faulty. Replace if
necessary.
3. The Start/Stop button may be
faulty. Check or replace.
F-9
See