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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
The line circuit breaker trips
when power switch is “ON”
1. Input power Bridge is shorted.
2. Failed Electrolytic Capacitors.
3. Failed Inverter IGBTʼs.
1. Perform the Input Board
Resistance Test.
2. Perform the Inverter Board
Resistance Test.
The machine is dead, no output,
no fan
1. No input power on line.
2. Line Switch failure.
3. Defective Input Board.
4. Defective Inverter Board
1. Restore correct Input power
2. Replace Line switch.
3. Perform Input Board Voltage
Test.
4. Perform Inverter Board
Voltage Test.
The GREEN LED is “ON” but
there is no output And yellow
thermal overload LED is “ON”
1. Thermal Protection has
tripped.
2. Logic Circuit Error on Control
Board.
3. ARFU System Damage on the
Input Board
1. Check Fan and Thermal
Protection Circuits.
2. Perform Input Board
Resistance and Input Board
Voltage Tests
3. The Control Board may be
faulty. Replace.
THEORY OF OPERATION
F-4 F-4
INVERTEC® V155-S
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The YELLOW LED is “ON” and
the RED and GREEN LEDʼs blink
alternately
1. The machine is unable to cool
itself.
1. Turn the Power Switch OFF and
wait several minutes for the
machine to cool. Turn the Power
Switch back ON and check for
proper fan operation.