Lincoln Electric IM746 POWER WAVE 405 - Manual (Page 33)

E-5 TROUBLESHOOTING E-5
POWER WAVE 405
Observe all Safety Guidelines detailed throughout this manual
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
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.
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
Thermal LED is lit.
Machine won’t weld, can’t get any
output.
1. Fan thermostat has opened.
Check for proper fan operation.
(Fan 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. Blow air in rear louvers
to remove dirt around the fan.
2. Secondary rectifier or Choke
thermostat has opened. After
machine has cooled, reduce
load, duty cycle, or both. Check
for material blocking intake or
exhaust louvers.
3. DC Bus PC board thermostat
has opened check for excessive
load on 40VDC supply.
1. Input voltage is too low or too
high. Make certain that input
voltage is proper, according to
the Rating Plate located on the
rear of the machine.
2. If the Thermal LED is also lit,
see “Yellow Thermal LED is Lit”
section.
3. Primary current limit has been
exceeded. Possible short in out-
put circuit. Turn machine off.
Remove all loads from the out-
put of the machine. Turn back
on. If condition persists, turn
power off, and contact an autho-
rized Lincoln Electric Field
Service facility.
4 . 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. See
"Troubleshooting the Power Wave
/ Power Feed System Using the
Status LED" section of this text.
If all recommended possible areas
of misadjustments have been
checked and the problem persists,
contact your local Lincoln
Authorized Field Service Facility.