Replace a Power Supply

Remove a Power Supply

Caution

Disconnect the AC power cord from the wall outlet and from the power supply before removing an AC power supply. Ensure that the DC circuit is de-energized before removing a DC power supply.

Use the following instructions to remove a power supply.

1. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end to an appropriate ground point on the rack.
   

   Caution

   Power supplies can become very hot during operation. Wear thermal protective gloves when you remove a power supply from an operating switch.
2. Note the orientation and the airflow direction of the installed power supply, and the location of the latching tab on the power supply.
3. Push the latching tab toward the power supply handle and pull outward on the handle to disengage the power supply internal connectors.

   

   Remove a Power Supply

   

   

   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.

Replace or Install a Power Supply

Use the following instructions to replace or install a power supply.

1. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end to an appropriate ground point on the rack.
2. If necessary, remove a blank panel from the back of the switch.
3. Ensure that the orientation of the power supply is correct, and that the new power supply's airflow direction (front-to-back or back-to-front) is compatible with the installed fan modules and any other installed power supplies.
4. Carefully slide the power supply all the way into the power supply slot.

   

   Install a Power Supply

   

5. Push the power supply in until the latch snaps into place.

   Do not slam the power supply into the switch.

   

   Note

   Be sure to install a cover over any unoccupied power supply slots. Unoccupied power supply slots must always be covered to maintain proper system ventilation and EMI levels.

To install or replace a second power supply repeat this procedure.

• After installing an AC power supply, connect the power cord to the power supply and to a grounded AC power outlet.
  

  Warning

  Always make sure that the source outlet is properly grounded before plugging the AC power cord into the AC power supply.

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

Connect an AC Power Supply to an AC Power Outlet Using the Retainer

1. Connect the AC power cord.
   1. If necessary, slide the plastic cord retainer farther away from the back of the switch.
   2. Connect the AC power cord to the input connector.
   3. Open the clip and slip it over the barrel of the connector.

      The diagram below - Power Supply with Power Cord and Retainer Attached shows the power supply with the power cord and retainer in place.

      

      Power Supply with Power Cord and Retainer Attached

      

   4. Snap the clip firmly around the connector.
2. Connect the other end of the power cord to an AC power outlet.
   

   Note

   Always make sure that the source outlet is properly grounded before plugging the AC power cord into the AC power supply.

Leave the ESD strap permanently connected to the rack, so that the strap is always available when you need to handle ESD-sensitive components.

• After installing a DC power supply, ground the power supply and connect the power supply to the power source.
  

  Warning

  Connect the chassis ground wire before you connect any power cables.