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

Page 96

F-36

AUXILIARY TRANSFORMER PRIMARY WIRING HARNESS TEST

(continued)

FIGURE F.9 - RECONNECT PANEL/TERMINAL STRIP 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

Procedure described 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 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.

9. Remove plug J30 from the protection

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

NOTE: If removing plug J30 solves the prob-
lem, check for a short circuit or a fault in the 24
VAC circuit (plug P71) and the main contactor
coil. See the Input and Auxiliary Circuit Wiring
Diagram, Figure F.10.

POWER WAVE 450