The machine has high welding output and no control, Troubleshooting & repair, Caution – Lincoln Electric IDEALARC SVM 122-A User Manual
Page 51
TROUBLESHOOTING & REPAIR
F-7
F-7
LINCOLN
®
ELECTRIC
IDEALARC DC-400
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
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
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The machine has high welding out-
put and no control.
1. If remote control is being used,
set the Output Control switch
(S2) in the OUTPUT CONTROL
“LOCAL” position and control
the weld output with the
machine Output Control poten-
tiometer (R4). If the problem is
solved, check the remote con-
trol unit (or wire feeder) and
associated control cable.
1.
Check the Output Control
switch (S2) and associated
wiring.
2. Check feedback leads #225
(negative output terminal), #205
and #206 (output shunt) for
loose or faulty connections.
See Wiring Diagram.
3. Perform the SCR/Diode Rec-
4.
The control board may be
faulty. Replace.