Replacing a Summit 450 W or 550 W AC Power Supply

Summit 450 W power supplies are compatible with switches that have front-to-back ventilation airflow. Summit 550 W power supplies are available for switches with either front-to-back or back-to-front airflow.

You need the following tools and materials to replace a 450 W or 550 W AC power supply:

In a switch with a redundant power configuration, you can replace one Summit AC power supply without powering down the switch.

Note

Note

You cannot combine 450 W power supplies and 550 W power supplies in the same switch.

To replace a 450 W or 550 W AC power supply:

  1. Disconnect the AC power cord from the wall outlet and from the power supply.
  2. Note the orientation of the installed power supply.
  3. For a Summit X670 series switch, note the direction of ventilation airflow, and verify that the power supply airflow direction is the same as that of the switch.

    In a switch with front-to-back airflow, the fan modules are labeled Air Out.

    In a switch with back-to-front, the fan modules are labeled Air In.

  4. Push the latching tab toward the power supply handle and pull outward on the handle to disengage the power supply internal connectors.
    See Removing a 450 W or 550 W AC Power Supply.
    Click to expand in new window
    Removing a 450 W or 550 W AC Power Supply
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  5. 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.

  6. Verify that the replacement power supply is oriented the same way as the unit you removed.
    For a Summit X670 series switch, verify that the airflow direction of the power supply matches the airflow direction of the switch.
  7. Carefully slide the power supply all the way into the power supply bay.
    See Installing a 450 W or 550 W AC Power Supply.
    Click to expand in new window
    Installing a 450 W or 550 W AC Power Supply
    ../Graphics/SH_138.svg
  8. Push the power supply in until the latch snaps into place.
    Caution

    Caution

    Do not slam the power supply into the switch.
  9. 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.

  10. If the power supply is equipped with a power cord retainer, use the retainer to secure the power cord to the power supply.