System 12 SCR Drive
6-129
6
iControl DC
1. Remove the semiconductor fuse attached to the SCR device being replaced.
2. Remove bus bars G and H.
3. Loosen and remove the screws in terminals 2 and 3 on SCR1 - SCR6. (The terminal
number is on top near the left side of the SCR pack.)
4. Remove bus bars A and B and the connecting wires from the SCR-SN board.
5. Remove the mounting screws and the leads that go to the Firing board (SCR-DS)
6. Remove the heatsink gasket.
7. Clean the surface of the heatsink where the SCR device is to be placed. There cannot be
any foreign matter between the SCR and the heatsink.
8. Install the SCR device, heatsink gasket, and mounting screws. Torque the mounting
screws to 40-48 inch pounds.
9. Install the standoff (M6 x 16MM, 41-04-0036) and the split washer (1/4", 19-04-0013).
Torque the standoff to 22-30 inch pounds. Note: Over-torquing will damage the stand-
off.
10. Reinstall bus bars A and B and the connecting wires.
11. Torque the screws to 40-48 inch pounds. Ensure that the shaft of the ring lug stays over
the bus bar it is attached to. The ring lug should not touch the other bus bar. To main-
tain clearance, the ring lug cannot pass the edge of the bus bar.
12. Reinstall semiconductor fuses and bus bars G and H.
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