Cisco Systems MGX 8800, MGX 8900 Swapping a Primary or Redundant DC Power Entry Module with Power On

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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter6 Maintaining the Cisco MGX Switch or Gateway
Swapping a Primary or Redundant DC Power Entry Module with Power On
Swapping a Primary or Redundant DC Power Entry Module with
Power On
If necessary, you can replace either a primary or a redundant DC power entry module (PEM) with power
on. To avoid possibly tripping the system circuit breaker in the process, complete the following steps.
Caution Do not use a power screwdriver on captive screws.
Warning Before working on a chassis or working near power supplies, unplug the power cord on AC units;
disconnect the power at the circuit breaker on DC units. Statement 12
Step1 Connect a grounding strap to the ESD grounding jack or to the equipment rack.
Step2 Turn off the circuit breaker only on the DC PEM that you intend to replace.
Step3 Turn off the branch circuit at the DC source (the distribution box, for example) for the correct branch.
Step4 Disconnect DC source wiring:
•If your terminal block has a plastic cover, complete Step 5 and Step 6 to disconnect the DC source
wiring. Then proceed to Step 10.
•If your terminal block does not have a plastic cover, proceed to Step 7.
Step5 Use a Phillips-head screwdriver to remove the plastic terminal block cover on the DC PEM that you
intend to replace (see Figure6-1).