Lincoln Electric POWER WAVE IM986 Operator's Manual page 43

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TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Machine wonʼt weld, canʼt get any
output.
(CR1 will not pull in.)
This problem will normally be
accompanied by an error code.
Error codes are displayed as a
series of red and green flashes by
the status light(s). See "Status
Light" section of this document for
additional information.
Thermal LED is ON.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con-
tact your local authorized Lincoln Electric Field Service Facility for technical assistance.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
1. Input voltage is too low or too
high.
2. Thermal Error.
3. Primary current limit has been
exceeded. (the main contactor
drops out when output is initiat-
ed – see error 31).
4. Inverter Fault - switch pc board,
contactor problem, etc.
1. Improper fan operation.
2. Output Rectifier board or Choke
thermostat.
3. DC Bus PC board thermostat.
4. Open thermostat circuit.
POWER WAVE® i400
detailed in the beginning of this manual.
CAUSE
Observe Safety Guidelines
RECOMMENDED
COURSE OF ACTION
1. Make certain that input voltage is
correct, according to the Rating
Plate located on the rear of the
machine.
2. See "Thermal
ON" section.
3. Possible short in output circuit.
Turn machine off. Remove all
loads from the output of the
machine. Turn back on, and acti-
vate output. If condition persists,
turn power off, and contact an
authorized Lincoln Electric Field
Service facility.
4. Contact your local authorized
Lincoln Electric Field Service
facility for technical assistance.
1. Check for proper fan operation.
(Fans should run whenever out-
put power is on.) Check for
material blocking intake or
exhaust louvers, or for excessive
dirt clogging cooling channels in
machine.
2. After machine has cooled,
reduce load, duty cycle, or both.
Check for material blocking
intake or exhaust louvers and
heat sink fins.
3. Check for excessive load on
40VDC supply.
4. Check for broken wires, open
connections or faulty ther-
mostats on the DC Bus and
Output Rectifier heat sinks, and
Choke assembly.
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LED is