Lincoln Electric 355M Manuel d'utilisateur télécharger pdf (Page 117)

OUTPUT RECTIFIER MODULES REMOVAL AND REPLACEMENT (con’t)

TROUBLESHOOTING AND REPAIR

F-71 F-71

POWER WAVE 355M/405M

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8. Under the copper plate previously removed, there

is an allen bolt. Remove it using a 9/64” allen

wrench. See Figure F.33.

9. Using a 7/16” socket remove the mounting bolts at

the top and bottom of the modules. See Figure

F.33.

10. The output rectifier modules are ready for removal

and/or replacement.

11. Before replacing the diode module, apply a thin

even coat of Penetrox A-13 heatsink compound

to the bottom surface of the diode module. Note:

Keep the compound away from the mounting

holes.

12. Press the module firmly against the sink while

aligning the mounting holes. Insert each outer

screw through a spring washer and then a plain

washer and into the holes. Start threading all

three screws into the heat sink (2 or 3 turns by

hand).

13. The screw threads may catch on the threads of

the heat sink, so be sure to get the face of the

screw into contact with the surface of the module

(using just hand torque).

14. Using a 7/16” socket, tighten each mounting bolt

to between 5 and 10 inch pounds.

15 Tighten the center allen screw to between 12 and

18 inch pounds.

16. Tighten each mounting bolt again (30 to 40 inch

pounds this time).

15. Replace leads #X2, #X4, #20, #40 to their original

terminals in their proper positions. Torque bolts to

30-40 Inch Pounds.

16. Perform the Snubber Board Replacement

Procedure detailed earlier in this section.

17. Replace the case wraparound cover.

Mounting

3/16" Allen

Bolts

9/64" Allen

Bolts

Mounting

Bolts

FIGURE F.33 – OUTPUT RECTIFIER MODULE MOUNTING BOLT LOCATIONS

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 136 137

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Lincoln Electric 355M Manuel d'utilisateur Page 117

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