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TROUBLESHOOTING & REPAIR
F-5 F-5
IDEALARC DC-655
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
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
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The input contactor chatters. 1. Check the three-phase input
line voltage at the machine.
The input voltage must match
the rating plate and reconnect
panel configuration.
1. Check for loose or faulty wiring
between the input power
switch (SW1), the fault protec-
tion relay (CR2) and the input
contactor. See the Wiring
Diagram.
2. The fault protection relay (CR2)
may have defective contacts.
Check or replace.
3. The control board may be
defective. See the Control
Board LED Chart.
4. The input contactor may be
faulty.
The machine is dead - the input
contactor does not operate. The
pilot light is lit.
1. Check the three-phase input
line voltage at the machine.
The input voltage must match
the rating plate and reconnect
panel configuration.
2. Turn the machine off and then
back on to reset the fault pro-
tection circuit. See the Control
Board LED Chart.
1. Check the wiring between the
fault protection relay (CR2) and
the input contactor (CR1).
2. The fault protection relay (CR2)
may have defective contacts.
Check or replace.
3. The input contactor may be
faulty.