System 12 SCR Drive
6-131
6
iControl DC
Commutation SCR/Diode and Dual Diode Device To gain access to the Com-
mutation SCR/Diode and Dual Diode Device, the SCR–DS board must be partially removed.
We suggest you leave the connections on the bottom of the board connected and remove only
the mounting screws.
Figure 6.28 Replacing the Commutation SCR/Diode and Dual Diode
1. The SCR-DS board is directly over the Commutation SCR. This means that the SCR-DS
board must be moved into a position that will not interfere with the removal or installa-
tion of the commutation SCR. Refer to “Replacing the SCR-DS board.”
2. Label all the wires connected to the device being removed before disconnecting them.
3. Note the orientation of the device, then remove it and clean the surface of the SCR
mounting plate.
4. Install the new device. Torque the mounting screws to 22-30 inch pounds.
5. Reconnect all wires. Torque the terminal screws to 22-30 inch pounds.
6. Reinstall the SCR-DS board.
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