Troubleshooting - Lincoln Electric POWERWAVE IM762-C Operator's Manual

E-4
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is evident when the sheet metal
covers are removed.
Input fuses keep blowing, or input
breaker keeps tripping.
Machine will not power up (no
lights, no fan, etc.)
Thermal LED is lit.
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
CAUSE
1. Contact your local authorized
Lincoln Electric Field Service
facility for technical assistance.
1. Make certain that fuses or
breakers are properly sized.
See Installation section of this
manual for recommended
fuse and breaker sizes.
2. Welding procedure is drawing
too much output current, or
duty cycle is too high.
Reduce output current, duty
cycle, or both.
3. There is internal damage to
the power source. Contact an
authorized Lincoln Electric
Service facility.
1. Make certain that the Power
Switch (SW1) is in the "ON"
position.
2. Circuit breaker CB4 (in recon-
nect area) may have opened.
Reset. Also, check input volt-
age selection, below.
3. Input voltage selection made
improperly. Power down,
check input voltage reconnect
according to diagram on
reconnect cover.
1. Fan thermostat has opened.
Check for proper fan opera-
tion. (Fan should run whenev-
er output power is on.) Check
for material blocking intake or
exhaust louvers, or for exces-
sive dirt clogging cooling chan-
nels in machine.
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 exces-
sive load on 40VDC supply.
POWER WAVE 455M
RECOMMENDED
COURSE OF ACTION
If all recommended possible areas
of misadjustments have been
checked and the problem persists,
contact your local Lincoln
Authorized Field Service Facility.
E-4