IBM 4957-J11, Hardware Installation And Maintenance Manual

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Installing a PSU module
About this task
Refer to Figure 27 on page 57 and Figure 28 on page 57 when performing this procedure, but ignore the
directional arrows - since you will insert the module into the slot - rather than remove it.
Important: Handle the PSU carefully, and avoid damaging the connector pins. Do not install the PSU if
any pins appear to be bent.
Procedure
1. Check for damage, especially to all module connectors.
2. With the PSU handle in the open position, slide the module into the enclosure, taking care to support
the base and weight of the module with both hands.
3. Lever the module home by manually closing the PSU handle. You should hear a click as the latch
handle engages and secures the PSU to its connector on the back of the power mid-plane.
4. Connect the power cable to the power source and the PSU.
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. Route the cables as shown in “3” on page 40 of
“Routing cables using the CMA” on page 38, ensuring they lay flat on the CMA shelf and through the
PSU cable clips assembly. See also “Enclosure rear panel” on page 8.
5. Verify that the bi-tonal PSU Status LED is on/green. Verify that cooling fans are spinning with no fail
states. Verify that the front panel LED states show no amber module faults.
6. Repeat this procedure if replacing two PSUs. Keep in mind the Enclosure rear panel illustrations TIP
Replacing a system fan module
Procedures for the removal and installation of system fan modules.
This section provides procedures for replacing a failed system fan module. Within this CRU module, if one
of the two internal rotors fails, then a fault occurs, indicating module failure. Illustrations in system fan
replacement procedures show rear panel views of the enclosure, with the fan properly oriented for
insertion into the rear panel of the enclosure.
If a system fan module fails, the remaining three fans are sufficient to maintain operation of the
enclosure. You need not halt operations and completely power-off the enclosure when replacing only one
system fan; however, a complete orderly shutdown is required if replacing multiple system fan modules
simultaneously.
CAUTION: Do not remove the cover from the system fan module due to danger from electric shock
inside. Return the module 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 system fan module
About this task
CAUTION: Removing a system fan module significantly disrupts the enclosure’s airflow. Do not
remove the fan until you have received the replacement module. It is important that all fan module
slots are filled when the enclosure is in operation.
58 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual