Replace an 1100 W AC Power Supply

The switches have two bays for hot-swappable power supplies. In a switch with a redundant power configuration, you can replace one AC power supply without powering down the switch. All installed power supplies must blow air in the same direction and must match the airflow direction of the installed fan modules.

You need the following tools and materials to replace a 1100 W AC power supply:

  • Thermal protective gloves
  • AC power cord, if you will not be re-using the cord from the removed power supply

To replace a 1100 W AC power supply, follow these steps:

  1. Disconnect the AC power cord from the wall outlet and from the power supply.
  2. Note the orientation of the installed power supply, and the location of the latching tab at the right of the unit.
  3. Push the latching tab toward the power supply handle and pull outward on the handle to disengage the power supply internal connectors.
    See Removing an 1100 W AC Power Supply.
    Click to expand in new window
    Removing an 1100 W AC Power Supply
    Remove 5520 PSU with direction arrows and pull tab
  4. Carefully slide the power supply the rest of the way out of the switch.
    Caution

    Caution

    Power supplies can become very hot during operation. Wear thermal protective gloves when you remove a power supply from an operating switch.
    Note

    Note

    If you are not installing a replacement power supply, install a cover over the unoccupied power supply bay. Unoccupied bays must always be covered to maintain proper system ventilation and EMI levels.
  5. Verify that the replacement power supply is oriented the same way as the unit you removed, and has the same airflow direction.
  6. Carefully slide the power supply all the way into the power supply bay.
    See Installing an 1100 W AC Power Supply.
    Click to expand in new window
    Installing an 1100 W AC Power Supply
    Install a 5520 PSU with direction arrow
  7. Push the power supply in until the latch snaps into place.
    Caution

    Caution

    Do not slam the power supply into the switch.
  8. Connect the power cord to the power supply and to a grounded AC power outlet.
    Warning

    Warning

    Always be sure that the source outlet is properly grounded before plugging the AC power cord into the AC power supply.
  9. If the power supply is equipped with a power cord retainer, use the retainer to secure the power cord to the power supply.
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