IDEALARC DC-600
F-8
TROUBLESHOOTING & REPAIR
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Machine has minimum output and
no control.
The machine does not have maxi-
mum weld output.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1.
If a remote control unit is NOT
connected to the terminal strip
#75, #76, and #77 terminals,
the OUTPUT
CONTROL
SWITCH must be in the "OUT-
PUT CONTROL AT DC600"
position.
2.
If a remote control cable is con-
nected to terminals #75, #76
and #77 the leads may be
"shorted" to the positive weld
output.
3.
Make certain the Three Phase
input voltage is correct and
matches the machine rating
and the reconnect panel.
1. Check all Three-Phase input
lines at the DC600. Make
sure input voltages match
machine rating and recon-
nect panel.
2. Put OUTPUT
CONTROL
SWITCH (SW3) in "OUT-
PUT CONTROL AT DC600"
position. If problem is solved
then check remote control
unit or wire feeder.
RECOMMENDED
COURSE OF ACTION
1.
Check the OUTPUT CON-
TROL
POTENTIOMETER
(R1) and associated wiring.
2.
Check the OUTPUT CON-
TROL SWITCH (SW3), the
WELDING MODE SWITCH
(SW4) and associated wiring.
3.
Perform the Control Board
test.
4.
Perform the Firing Board test.
5.
Perform the SCR Output
Bridge test.
6.
Perform the Main Transformer
test.
1. Check the OUTPUT CON-
TROL POTENTIOMETER
(R1) and associated wiring
for loose or faulty connec-
tions. See wiring diagram.
2. Perform Control Board test.
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.
OUTPUT PROBLEMS
CAUTION