Troubleshooting & repair, Caution – Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B User Manual

Page 71

TROUBLESHOOTING & REPAIR

F-11

POWER WAVE 450

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 test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-
800-833-9353.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

OUTPUT PROBLEMS

Machine regularly overheats-yel-
low light (LED) on the front panel
glows, indicating a thermal over-
load. The display is on.

1. Welding application may

exceed recommended duty
cycle.

2. Dirt and dust may have

clogged the cooling channels
inside the machine. Refer to
the Maintenance Section of
this manual.

3. Air intake and exhaust louvers

may be blocked due to inade-
quate clearance around
machine.

4. Make sure both fans are func-

tioning correctly.

1. One of the thermostats located

on the output rectifier or FET
heat sink may be faulty. Test
or replace.

Machine does not appear to over-
heat, but yellow light turns on and
off intermittently. Output is dis-
abled whenever yellow light is on.

NONE

1. Check thermostats on output

rectifier and switch board #1.
These thermostats are normal-
ly closed.

2. Check leads from thermal

switches to molex plug J23 on
the control board for loose or
faulty connections.

3. The control board may be

faulty. Replace, and perform
voltage calibration and current
calibration procedures.