Replace a DC Power Supply

Time required:

10 to 15 minutes

Parts required:

Replacement DC power supply ordered from HPE

Information required:
  • RMA (Return Material Authorization) work order
  • Case number
  • Array serial number
Tools required:
  • ESD (electrostatic discharge) strap or appropriate grounding device
  • Phillips screwdriver

Support contact:

See Support.

HPE recommends using the Maintenance Window functionality within the HPE InfoSight portal to inform HPE Support of upcoming maintenance windows.

Refer to https://infosight.hpe.com/dashboards/nimble/wellness/maintenance-windows for more information.

You can disable automated support case generation during planned maintenance from the Manage Maintenance Windows page. After a maintenance window is set, no further communication with HPE Support is required.

A PSU with an amber LED may have a fault. But an amber LED also indicates:

  • The external power is switched off with the DC power connected
  • The power supply is not properly seated in its slot
  • The array is powered off
  • A power supply internal fault has occurred

Verify that the power cord is plugged in, then check for and correct these conditions before you assume that the PSU in your HPE storage array needs to be replaced.

Caution:

Before you attempt to replace a power supply:

  • Do not remove the PSU until you are ready to install the replacement
  • Never unplug or unseat both PSUs at the same time
  • Use only UL-approved power cords

Use this procedure to replace a failed DC power supply unit (PSU) on your HPE storage array or expansion shelf.

Power supplies are replaced as a complete unit. One PSU can adequately power the array while the other PSU is being replaced.

The procedure is the same for all HPE Nimble Storage arrays.


  1. The LED on a failed PSU is amber or dark.

    1. Power supply LED
  2. Remove the power cord from the PSU by pulling back on the sliding tabs on the sides of the cord and then pulling the cord out of the socket.
    Caution:
    Before proceeding, verify that the DC power source is turned off at the circuit breaker.

    Unscrew the two wire connections labeled + (RTN) and - (-48V) from the PSU and pull the wires out.

  3. Gently push the release tab down, grasp the handle, and pull out the PSU.

    The PSU does not slide out unless the release tab is pressed down.

    1. Release tab
    2. Handle
  4. Insert the new PSU. Push in gently until you hear a click.

    Do not force the power supply. If it fails to install properly, contact HPE Support.

  5. Attach the power connections to the PSU.

    Screw in the two wires from your DC power source to the connections labeled + (RTN) and - (-48V).

    Power is automatically restored to the PSU when the connection is made and the DC power source is turned on.

  6. After no more than two minutes, verify that the LED on the PSU is lit and appears solid green.
    1. Power supply LED

    If the LED does not stop blinking and go solid green, check the connection to the power source. If that does not work, contact HPE Support.

  7. Contact HPE Nimble Storage Support. They will verify that the new PSU is operating properly.
  8. Return the failed PSU as directed on the RMA work order.