Cisco MGX MGX 8800 Hardware Installation Manual page 526

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.
Do not use a power screwdriver on captive screws.
Caution
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
Connect a grounding strap to the ESD grounding jack or to the equipment rack.
Step 1
Turn off the circuit breaker only on the DC PEM that you intend to replace.
Step 2
Turn off the branch circuit at the DC source (the distribution box, for example) for the correct branch.
Step 3
Disconnect DC source wiring:
Step 4
•
•
Use a Phillips-head screwdriver to remove the plastic terminal block cover on the DC PEM that you
Step 5
intend to replace (see
Cisco MGX 8800/8900 Series Hardware Installation Guide
6-2
If your terminal block has a plastic cover, complete
wiring. Then proceed to Step
If your terminal block does not have a plastic cover, proceed to
Figure 6-1).
Chapter 6
Step 5
10.
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Maintaining the Cisco MGX Switch or Gateway
and Step 6 to disconnect the DC source
Step 7.