Lincoln Electric INVERTEC V250-S Bedienungsanleitung PDF herunterladen (Seite 79)

F-47

TROUBLESHOOTING & REPAIR

F-47

7. Using the 1/4” nut-driver remove the

two screws holding the P.C. board to

the heat sink mounting bracket.

8. With the 3/16” Allen wrench remove

the four socket head cap screws and

washers holding the power board to

the large aluminum heat sink.

9. Carefully remove the power board

taking note as to the amount of heat

sink compound used between the

IGBTs and the large aluminum heat

sink. Note: Be sure to observe static

electricity precautions when handling

P.C. boards.

If the filter capacitors are to be

removed see

Filter Capacitor

Removal and Replacement

POWER BOARD REPLACEMENT

PROCEDURE

10. Apply a thin coat of Dow Corning

340 heat sink compound (Lincoln

E1868) to the filter capacitor termi-

nals. Do not apply to screw threads

or threaded area of terminals.

11. When replacing the power board

apply a thin coating (.005 to .010)

of Dow Corning 340 heat sink

compound (Lincoln E1868) to the

mating surfaces between the

IGBTs and the aluminum heat

sink. Compound is NOT permitted

on the screw heads or mounting

hole threads. The mating surfaces

must be clean and free of any for-

eign material.

12. Install the power board and tighten

the four cap head screws. Torque

the cap head screws to 40 to 48 IN.

Lbs. Note: Before tightening make

certain the capacitor terminals are

aligned with their respective holes

in the power P.C. board.

13. Assemble the leads #202A, #207A,

#203A and #206 to their respective

capacitor terminals using the bolts,

lockwashers and 7/16” wrench.

Torque to 50 - 60 IN. Lbs.

14. Using the 1/4” nut-driver install the

two screws holding the P.C. board

to the heat sink mounting bracket.

15. Connect leads #201, #204, #205,

#208, and #209 to their appropriate

terminals.

16. Replace plug J6 into power board.

17. Replace any previously removed

cable ties.

18 Inspect, clear and secure all leads

in preparation for case wrap-around

reassembly.

POWER BOARD REMOVAL AND REPLACEMENT (continued)

INVERTEC V250-S

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