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CHAPTER 11: MAINTENANCE REPLACE FRONT PANEL

L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 11-21

To replace the CPU module:

1. With power to the unit off, at the back of the CPU module in the second slot, disconnect any cables. Remove the silver

SFP connector(s) from the CPU module, and keep it handy. Then remove the CPU module by sliding the module out

from the front of the relay. (See the next section for instructions.)

Figure 11-22: Remove silver SFP connector (shown here under LK1 label)

2. At the front of the relay, insert the new CPU module in the second slot. The new CPU has two connection slots on the

front. Ensure that the RS485 connector and the black cover plate are not on the back of the CPU module before sliding

the module into the front of the relay.

Figure 11-23: Rear of a CPU module before insertion without RS485 connector or cover plate

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GE L90 Specifications

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