Troubleshooting Guide - Lincoln Electric 11694 Service Manual

®
POWER WAVE S350
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage is
evident when the S350 case is removed.
The input fuses repeatedly fail or the input
circuit breakers keep tripping.
The machine will not power up. No lights or
displays. The machine appears to be off.
The Power Wave S350 does not have
welding output.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact your local authorized Lincoln
Electric Service Facility.
1. Make certain the fuses or breakers are
properly sized.
2. The welding procedure may be drawing
too much input current or the duty cycle
may be too high. Reduce the welding
current and/or reduce the duty cycle.
3. Check for error codes. See Status LED
Troubleshooting in this section.
1. Make sure the proper input voltage is
being applied to the machine (check
fuses or breakers).
2. Make sure the input supply disconnect
has been turned ON.
3. Make certain the input power switch
(SW1) is in the ON position.
4. Check for error codes. See Status LED
Troubleshooting in this section.
1. Make sure the input voltage is correct.
2. If the symptom is accompanied by
an error code , see Status LED
Troubleshooting in this section.
3. There may be an external "short" in
the external output circuitry. Remove
all loads from the output terminals and
restart the machine.
4. If the thermal LED is lit the unit may be
overheated. Adjust the welding load
and/or duty cycle to coincide with the
output limits of the Power Wave S350.
Also see the symptom "The thermal LED
is ON" in this section.
CAUTION
TROUBLESHOOTING AND REPAIR

TROUBLESHOOTING GUIDE

RECOMMENDED
COURSE OF ACTION
1. Contact the Lincoln Electric Service
Department at 1-888-935-3877.
1. Perform the Input Rectifier Test.
2. Perform the Switch Board Test.
3. Perform the Power Factor Correction
Control Board Test.
1. Check the input switch SW1 for proper
operation. Also check the associated
leads for loose or faulty connections.
See the Wiring Diagram.
2. Check to make sure that 40VDC is being
applied to the optional user interface
board at leads 52D(+) to lead 51D(-).
See the Wiring Diagram.
3. Perform the DC Bus Board Test.
4. Perform the Input Rectifier Test.
5. Perform the Power Factor Correction
Control Board Test.
1. Perform the Input Rectifier Test.
2. Perform the Switch Board Test.
3. Perform the Planar Transformer
Resistance Test.
4. Perform the Control Board Test.
5. Perform the Optional User Interface
Board Test.
6. Perform the Output Rectifier Test.
7. Perform the DC Bus Board Test.
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