7. With the help of multiple persons or a mechanical lift, lift and remove the
enclosure from the rack.
Replace the enclosure in the rack
8. To reinstall or return the expansion enclosure in the rack, follow the procedure
in “Installing or replacing an expansion enclosure in a rack: 2077-92F” on page
52.
Removing a power supply: 2077-92F
You can remove either of the redundant power supply units in a 2077-92F
expansion enclosure. Redundant power supplies operate in parallel; one continues
to provide power to the enclosure if the other fails.
Before you begin
Important: You can remove a PSU without powering off the expansion enclosure.
However, to maintain operating temperature, ensure that you perform the
following tasks.
v Do not remove a faulty PSU until its replacement is ready to be installed.
v Do not remove a PSU from an operational enclosure for more than
approximately 10 minutes. The reduction in airflow through the enclosure might
cause the enclosure or its components to shut down to protect from overheating.
About this task
Each PSU provides cooling to the lower part of the enclosure. Ensure that the
second PSU in the enclosure is powered on and operating correctly. For example,
in Figure 86 on page 104, PSU 1 is operating while PSU 2 is being removed.
Review and follow the procedures for handling static-sensitive devices before you
remove the power supply unit (PSU).
Procedure
1. Read all safety information.
2. Remove the 1U fascia that covers the PSUs on the front of the expansion
enclosure, as described in “Removing the fascia: 2077-92F” on page 85.
3. Press on the handle lock to release the handles on the PSU.
4. Rotate the handles outward, as shown in Figure 86 on page 104.
Chapter 2. Installing the system hardware 103
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