Figure 8. Removing the power supply unit
Important: Insert the replacement PSU within 5 minutes; otherwise, the system may overheat and
shut down.
Replacing the PSU
5. Fold out the handle so that it extends perpendicular to the PSU.
6. While keeping the PSU handle extended and supporting the PSU, slide the power supply into the
enclosure until the release tab engages with a "click".
7. Connect the power cord to the power supply and to a properly grounded electrical outlet. Secure the
cable with the cable retention clip on the rear of the power supply unit.
Note: After the power cord is connected to the electrical outlet, make sure that the LED indicator,
shown in Figure 7 on page 25, is lit.
Removing and replacing a power interposer
A faulty power interposer can be removed and replaced with an identical or equivalent replacement part
from FRU stock.
A power interposer forms part of each power supply unit (PSU) slot and lls the space between the PSU
and the midplane. It can only be removed after its PSU is removed from the rear of the enclosure. Before
you remove or replace a power interposer, review the following guidelines for this procedure:
• Ensure that you identify the correct PSU and power interposer for removal. If a PSU or a power
interposer has a fault that prevents it from powering the enclosure and the functional power supply is
removed, the node canisters in the control enclosure will shut down.
In case a PSU or Power Interposer fails, you will see the following LED indication:
– Enclosure LED amber fault is ON (non-flashing)
– Amber fault LED on the faulty PSU is also ON
• Replace a power interposer only after the PSU replacement has failed to eliminate the fault condition.
• Do not insert a PSU into the slot while the power interposer is removed.
Warning:
Do not operate the enclosure without a power interposer and PSU in a PSU slot for
longer than 5 minutes. Operating for longer than this period might cause the control enclosure
to shut down due to overheating.
• No tools are required to complete this task. Do not remove or loosen any screws.
26
IBM Elastic Storage System 3000: Service Guide
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