Removing and replacing a power supply unit

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You can remove and replace either of the two hot-swap redundant power supply units (PSUs) in the enclosure. These redundant power supplies operate in parallel, one continuing to power the enclosure if the other fails.

About this task

Notes:
  • Do not operate the enclosure without a PSU in a PSU slot for longer than 5 minutes. Operating for longer than this period might cause the enclosure to shut down due to overheating.
  • Remove the replacement PSU from its packaging and have it available before you carry out this procedure.
  • No tools are required to complete this task. Do not remove or loosen any screws.
  • Be careful when you are replacing the hardware components that are located in the back of the system. Do not inadvertently disturb or remove any cables that you are not instructed to remove.
  • Electrostatic discharge precaution symbol When you replace this part, you must follow recommended procedures for handling electrostatic discharge (ESD)-sensitive devices.

Procedure

  1. Identify the location of the control enclosure that requires service. The Event Log contains the enclosure MTM and serial number.
  2. Identify the PSU that requires service; the Event Log contains the ID of the PSU that failed.

Removing the PSU

  1. Unwrap the hook-and-loop fastener cable retention strap and disconnect the power cord from the power supply unit that you are replacing.
    This figure shows the location of the AC power LED  1 , PSU handle and cable retention strap  2 , and PSU latch  3 .
    Figure 1. Features of a power supply unit
    Features of a power supply unit
  2. Being careful to not dislodge any cables, disconnect the cable management arm from the two brackets on the side of the enclosure nearest to the faulty PSU, and swing the CMA arms out of the way.
  3. While holding the PSU handle with your index and middle fingers, press and hold the release latch with thumb and pull the handle horizontally to slide the PSU from the enclosure.
    Support the PSU with your other hand as it is removed from the enclosure.

Replacing the PSU

  1. While supporting the PSU, slide the power supply into the enclosure until the release tab engages with a click.
  2. Reconnect the CMA to the rail and rack.
  3. Connect the power cord to the power supply and to a properly grounded electrical outlet. Secure the cable with the cable hook-and-loop strap on the rear of the power supply unit.
    Note: After the power cord is connected to the electrical outlet, make sure that the PSU LED indicator  1  shown in Figure 1, is lit.