Removing and replacing a power interposer

A faulty power interposer can be removed and replaced with an identical or equivalent replacement part from CRU stock.

About this task

A power interposer forms part of each power supply unit (PSU) slot and fills the space between the PSU and the midplane. It can be removed only 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 shut down.
  • See Procedure: Understanding the system status from the LEDs to determine when it is safe to remove the PSU and power interposer.
  • 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.

Procedure

  1. Remove the power supply unit, as described in Removing and replacing a power supply unit.

Removing the power interposer

  1. Remove the power interposer by pulling on the blue handle that is located beneath the PSU slot. Figure 1 shows an example.
    Figure 1. Sliding out the power interposer
    Replacing a power interposer
  2. Slide the power interposer out until it is clear of the enclosure rear, as shown in Figure 2.
    Figure 2. Removing a power interposer
    Replacing a power interposer

Replacing the power interposer

  1. Identify the correct empty power slot where the power interposer is to be installed.
  2. Hold the power interposer so that the connectors are near the PSU slot, as shown in Figure 3 ( 1 ).
  3. Slide the power interposer into the PSU slot until the handle is the only part that is visible at the rear of the enclosure, as shown in Figure 3 ( 2 ).
    Figure 3. Inserting the new power interposer
    Replacing a power interposer
  4. Replace the PSU that was removed in step 1. Follow the procedure that is described in Removing and replacing a power supply unit.
  5. Reconnect all cables.