Lincoln Electric Idealarc DC600 9773MSP Service Manual page 46

TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Input contactor (CR1) chatters.
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 216-383-2531 or 1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. The input line voltage may be
low. Check all three phases.
2. Make sure input line voltage
matches machine rating and
the reconnect panel is connect-
ed correctly for the line voltage.
1. Make sure input line voltage
matches machine rating and
the reconnect panel is connect-
ed correctly for the line voltage.
2. Remove all external wires
attached to terminal strip. ( 2, 4,
31, 32 75,76,77). If contactor
(CR1) functions correctly there
may be a "ground" or negative
intrusion on the remote control
leads (75, 76, or 77). There
may also be a "short" at the
welder output terminals.
3. If the problem persists after per-
forming steps #1 and #2 the
problem is in the DC600.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. The pilot relay (CR2) may
have bad contacts. Check or
replace relay.
2. Check for loose or faulty
wiring between pilot relay
(CR2) and input contactor
(CR1)coil connections.
3. The input contactor (CR1)
may be faulty.-Replace.
1. The CR1 interlock may be
faulty. Replace if necessary.
2. The ON/OFF PUSHBUTTON
may be faulty. Check or
replace.
3. Check internal remote control
circuit ( leads 75, 76 and 77)
and switch SW3 for grounds
or shorts.
4. The control board may be
faulty. Replace.
IDEALARC DC-600
F-5