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

Page 258

F-198

MAIN TRANSFORMER/CHOKE REMOVAL AND REPLACEMENT

(continued)

FIGURE F.75 - MAIN TRANSFORMER LOCATION

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 capaci-
tor discharge procedure to avoid
electric shock.

7. After you have completed the capacitor dis-

charge procedure for all four switch boards,
perform the FET Module Assembly
Removal Procedure. Refer to the proce-
dure in this section of the manual. After the
FET module assembly has been removed,
the main transformer and chokes are easily
accessible.

8. With the 3/8" socket wrench, remove the

four main transformer mounting bolts.

9. Disconnect the heavy leads between the

main transformer and the choke assembly.
You will need to cut the cable ties on the
insulating sleeve and slide the sleeve for-
ward to access the connection.

10. Lift the main transformer out. Remove the

background or output chokes if necessary
by removing any mounting bolts holding
the chokes to the machine frame bottom.

11. After reassembly test on high voltage

input and reconnect.

POWER WAVE 450