Lincoln Electric IDEALARC AC-1200 User Manual page 15

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PRObLEMS
(SYMPTOMS)
Welder welds at max. only no con-
trol.
Contacts chatter.
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
POSSIbLE
CAUSE
Diodes or SCR's on heat sink
assemblies shorted.
Shorted or grounded current controll
rheostat.
Output By-Pass Capacitors open or
disconnected.
Free wheeling diode open or discon-
nected.
P.C. board components failed.
Low supply line voltage.
Faulty contactor.
CAUTION
IDEALARC® AC-1200
RECOMMENDED
COURSE OF ACTION
Determine cause if possible and
replace shorted device.
Replace rheostat.
Replace or reconnect.
Replace or reconnect.
Determine cause if possible and
replace P.C. board.
Check with Power Company.
Repair or replace.
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