CHAPTER 9: MAINTENANCE REPLACE FRONT PANELC60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL 9-219To 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 silverSFP connector(s) from the CPU module, and keep it handy. Then remove the CPU module by sliding the module outfrom the front of the relay. (See the next section for instructions.)Figure 9-22: 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 thefront. Ensure that the RS485 connector and the black cover plate are not on the back of the CPU module before slidingthe module into the front of the relay.Figure 9-23: Rear of a CPU module before insertion without RS485 connector or cover plate
