Lincoln Electric IDEALARC DC-1500 Service Manual page 39

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Input contactor pulls in when
start button is pressed but
immediately drops out when
start button is released.
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. Make sure input voltages
match machine rating and
reconnect panel.
2. Remove all external wires
attached to terminal strip (2,
4, 31, 32, 73, 74, 75, 76, 77).
If contactor (1CR) functions
correctly, there may be a
ground or negative intrusion
on the remote control leads
(73, 74, 75, 76, or 77). There
may also be a short at the
welder output terminals.
3. If the problem persists after
performing steps #1 and #2,
the problem is in the DC-
1500.
CAUTION
IDEALARC® DC-1500
RECOMMENDED
COURSE OF ACTION
1. The 5CR interlock relay may
be faulty. Replace if neces-
sary (some older codes will
not have 5CR). An interlock
set of contactors will be on
1CR input contactor. 1CR
will have to be replaced.
2. The Start/Stop button may
be faulty. Check or replace.
3. Check internal remote con-
trol circuit (leads 73, 74, 75,
76 and 77) and switch SW4
for grounds or shorts.
4. The control board may be
faulty - Replace.
5. Check for a dirty or wet con-
trol box area or terminal strip
area. Clean or dry out.
6. A control pot, mode switch,
remote switch, and/or polari-
ty switch could be defective
and/or going to ground
(case). Remove from case
to test what component is
grounded. Replace defec-
tive component.
7. Check T7 isolation trans-
former. See wiring dia-
gram.
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