Lincoln Electric INVERTEC V155-S Service Manual page 36

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The line circuit breaker trips
when power switch is "ON"
The machine is dead, no output,
no fan
The GREEN LED is "ON" but
there is no output And yellow
thermal overload LED is "ON"
The YELLOW LED is "ON" and
the RED and GREEN LEDʼs blink
alternately
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.
THEORY OF OPERATION
All manuals and user guides at all-guides.com
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Input power Bridge is shorted.
2. Failed Electrolytic Capacitors.
3. Failed Inverter IGBTʼs.
1. No input power on line.
2. Line Switch failure.
3. Defective Input Board.
4. Defective Inverter Board
1. Thermal Protection has
tripped.
2. Logic Circuit Error on Control
Board.
3. ARFU System Damage on the
Input Board
1. The machine is unable to cool
itself.
CAUTION
INVERTEC® V155-S
RECOMMENDED
COURSE OF ACTION
1. Perform the Input Board
Resistance Test.
2. Perform the Inverter Board
Resistance Test.
1. Restore correct Input power
2. Replace Line switch.
3. Perform Input Board Voltage
Test.
4. Perform Inverter Board
Voltage Test.
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.
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.
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