Lincoln Electric V155-S - Manual (Page 37)

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
RED and GREEN LEDʼs are
always “ON”
1. Control Board failure. 1. Check all PC Board
Connections.
2. Replace Control Board.
The machine welds but there is
no output control
1. Potentiometer failure.
2. The Shunt screw
connections are bad.
3. Inverter Board failure.
1. Potentiometer or Control
Board needs Replaced.
2. Tighten and check all shunt
connections.
3. Perform Inverter Board
Voltage Test
.
The machine does not have
maximum output
1. Loose connections on output
secondary leads.
2. The Control Board is out of
Calibration.
1. Check all secondary
connections.
2. Recalibrate the Control Board.
Replace if needed.
THEORY OF OPERATION F-5 F-5
INVERTEC® V155-S
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