• Use conductive field service tools.
• Use a portable field service kit with a folding static-dissipating work mat.
Replacing a PSU module
Procedures for the removal and installation of power supply unit modules.
This section provides procedures for replacing a failed power supply unit (PSU) module. Illustrations in
PSU replacement procedures show rear panel views of the enclosure, with the PSU properly oriented for
insertion into the rear panel of the enclosure.
A single PSU is sufficient to maintain operation of the enclosure. You need not halt operations and
completely power-off the enclosure when replacing only one PSU; however, a complete orderly shutdown
is required if replacing both units simultaneously.
CAUTION: Do not remove the cover from the PSU due to danger from electric shock inside. Return
the PSU to your supplier for repair.
See CAUTION bullets regarding electrostatic discharge and anti-static protection in the “ESD
precautions” on page 55 section.
Tip: The illustrations show PSU module replacement as you face the enclosure rear panel. See also Figure
4 on page 8 and Figure 7 on page 10.
Removing a PSU module
About this task
CAUTION: Removing a power supply unit significantly disrupts the enclosure’s airflow. Do not
remove the PSU until you have received the replacement module. It is important that all CRU slots
are filled when the enclosure is in operation.
Before removing the PSU, disconnect the power from the PSU by physically removing the power source in
order to ensure your system has warning of imminent power shutdown. A faulty PSU must be replaced by
a fully operational PSU as soon as possible. Ensure that you correctly identify the faulty PSU before
beginning the step procedure.
Procedure
1. Stop all I/O from hosts to the enclosure. See also the Stopping I/O section.
Tip: This step is not required for hot-swapping. However, it is required when replacing both PSUs at
once.
2. Disconnect the power cable from the PSU power connector to power off the faulty PSU (it has no
power switch).
Note:
Power cables are typically routed to the PSU from the cable management arm (CMA). Verify that the
180º power cable bends lie flat in the CMA baskets. Ensure that the cable lays flat on the CMA shelf
and through the cable clip assembly. See also Figure 4 on page 8 and Step “3” on page 40 of “Routing
cables using the CMA” on page 38.
3. If replacing a single PSU via hot-swap, proceed to Step “5” on page 56.
4. If replacing both PSUs, verify that the enclosure was shut down using management interfaces, and
that the enclosure is powered off.
5. Verify that the power cord is disconnected.
6. Grasp the PSU handle latch between the thumb and forefinger and press the latch tab down to unlock
the handle. Revolve the handle out and downward to lever the PSU out of the enclosure as shown in
the figure below.
56 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual
Summary of Contents for 4957-J11
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