Installing Power Supplies

Before you begin

If the PSU blank module is inserted, remove it as follows:

  1. Unscrew the locking screw.
  2. Gently pull the power supply blank module out of the bay.
Figure 1. Inserted Power Supply Blank Module
  1. Power supply blank module
  • HVAC/HVDC power supplies automatically use the same airflow direction as the installed fan modules.
  • To implement n+n redundancy, there must be two external power sources and two PSUs attached to each power source. Otherwise, only one power source is required.
  • There must be an earth ground connection to the chassis to which you are installing the replacement module. Typically, the chassis is grounded by its metal-to-metal connection with a grounded rack. If you need to ground the chassis, see Grounding the Switch.

About this task

You can replace one power supply while the other one provides power to the switch.

Procedure

  1. Holding the power supply unit with one hand underneath it and the other hand holding the handle, turn the power supply so that its release latch is on the right side, and align the back end of the power supply (the end with the electrical connections) to the open power supply slot. Carefully slide the power supply unit all the way into the slot until it clicks into place.
    Note:

    If the power supply unit does not fit into the slot opening, turn the unit over and try again.

  2. Test the installation by trying to pull the power supply out of the slot without using the release latch.

    If the power supply does not move out of place, it is secured in the slot. If the power supply moves, carefully press it all the way into the slot until it clicks in place and tighten the locking screw.

  3. Attach the power cable to the electrical outlet on the front of the power supply.
  4. Make sure that the other end of the power cable is attached to the appropriate power source for the power supply. If the power source has a switch, slide it to the On position.
    Note:

    Depending on the outlet receptacle on your power distribution unit, you might need the optional jumper cable to connect the switch to your outlet receptacle.

  5. Verify that the power supply is operational by making sure that the power supply LED is green. For information on what the power supply LEDs indicate, see the Switch LEDs section.