Troubleshooting & repair, Warning, Main contactor test (continued) – Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B User Manual

Page 164: Test procedure

F-104

MAIN CONTACTOR TEST

(continued)

FIGURE F.35 - MAIN CONTACTOR

CR1

T2 T3

TROUBLESHOOTING & REPAIR

TEST 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,
visually inspect the input terminals L1, L2,
and L3 of the main contactor. Make sure
they are not shorted together. If they are
shorted, go to step 8. If they are not short-
ed, go to step 9.

8. With the slot head screw driver, remove

leads L1A and L3A from the main contactor.

POWER WAVE 450

WARNING