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

Page 232

F-172

INPUT RECTIFIER REMOVAL AND REPLACEMENT

(continued)

FIGURE F.65 - INPUT RECTIFIER LOCATION

CR1

TROUBLESHOOTING & REPAIR

PROCEDURE

1. Remove main input supply power to the

machine.

2. With the 3/8" nut driver, remove the 4

screws that hold the handle to the machine.

3. Remove the rubber gasket (cover seal) from

the lift bail.

4. With the 5/16" nut driver, remove the sheet

metal screws from the case top.

5. With the 5/16" nut driver, remove the

screws holding the right and left case sides.
Remove the case sides by lifting up and
out.

6. Perform

the

Capacitor Discharge

Procedure described earlier in this section
of the manual.

Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.

7. After you have completed the capacitor dis-

charge procedure for all four switch boards,
peel the silicone sealant away from the
M.O.V. assembly in order to expose the
heads of the screws that attach the three
heavy leads from the main input contactor
to the input rectifier. See Figure F.65.

8. With the Phillips head screw driver, remove

the three heavy leads from the input
rectifier.

9. With the Phillips head screw driver, remove

the positive (+) and negative (-) leads from
the input rectifier.

POWER WAVE 450

WARNING

1. MAIN CONTACTOR
2. M.O.V. ASSEMBLY
3. SILICONE SEALANT
4. INPUT RECTIFIER
5. 5MM ALLEN SCREW
6. HEAT SINK PANEL