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OUTPUT PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
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 1-888-935-3877.
CAUTION
Machine has maximum weld output
and no control.
1. If remote control is being used
set LOCALl/REMOTE SWITCH
(SW3) to ‘LOCAL’ position and
try to control weld output using
the Output Control
Potentiometer (R1) at the
DC600. If the problem is solved
check the remote control unit
(or wire feeder) and associated
control cable.
1. Check the LOCAL/REMOTE
Switch (SW3) and associated
wiring.
2. Check feedback leads #222
(negative output terminal),
#215, and #210 (output shunt)
for loose or faulty connections.
See Wiring Diagram.
3. Check the #75 lead for continu-
ity (zero ohms) from the Output
Control Potentiometer (R1) to
the control board connector
J1,Pin2. See Wiring Diagram.
4. Possible defective Control
Board or Firing Board. See the
PC Board Troubleshooting
Guide.
5. Perform the SCR Output
Bridge Test.
Machine has minimum output and
no control.
1. If a remote control unit is NOT
connected to the DC-600, the
LOCAL/REMOTE Switch must
be in the "LOCAL" position.
2. If a remote control cable is con-
nected, the control 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 the Output Control
Potentiometer (R1) and associ-
ated wiring.
2. Check the LOCAL/REMOTE
Switch (SW3), the Weld 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.
TROUBLESHOOTING AND REPAIR
F-7 F-7
DC-600
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