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

Page 92

F-32

AUXILIARY TRANSFORMER TEST #2

(continued)

FIGURE F.7 - TRANSFORMER T1 AND T2 LOCATION

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 Proce-

dure 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

discharge procedure for all four switch
boards, remove the PC board cover. Use
the 5/16" nut driver.

8. Remove plug J73 from the T1 transformer.

T2 is connected in parallel with T1.
Leaving the two transformers connected
in parallel for the test might result in incor-
rect readings; therefore plug J73 should
be disconnected.

9. Remove plug J30 from the protection

board. See Figure F.1 for location of the
board and plug J30.

10. Remove the 5 leads ( 3 heavy and 2 small)

T1, T2, T3 from main input contactor CR1.
This is a safety precaution. It prevents
high voltage from being put on the
machine during the test. Wrap tape
around the lead ends to insulate them and
prevent them from touching.

POWER WAVE 450