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E-2
PROBLEMS
(SYMPTOMS)
Input contactor (CR1) chatters.
Machine input contactor does not
operate.
Machine input contactor operates,
but no output when trying to weld.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
PROBLEMS
1. Faulty input contactor (CR1).
2. Low line voltage.
If Power Pilot light is off:
1. Make sure the proper three-
phase input power is applied to
the DC-655 machine.
2. The power switch (SW1) may be
faulty.
3. The pilot transformer may be
faulty.
If Power Pilot light is on:
1. The input contactor may be
faulty.
2. Input shutdown may be activated
(LED3 on on Control Board). See
Shorted Rectifier Fault
Protection in Operation Section.
1. Electrode or work cables may be
loose or broken.
2. Firing P.C. board is not connected
or is faulty. See PC board LED
information.
3. Trigger circuit may not be working.
Place Output Terminals Switch to
the ON position, or place a jumper
wire across #2 and #4 on the ter-
minal strip. If output is enabled
then check control cable to feeder
if connected.
4. If the thermal protection light is
ON the machine is overheated.
Make sure the fan is operating
and remove the cause of the
overheating problem.
CAUSE
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.
CAUTION
DC-655
RECOMMENDED
COURSE OF ACTION
E-2
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