Remove and Replace an AC Power Supply

The switches have one bay for a hot-swappable AC power supply, located on the rear switch panel. Since the 4120 Series has an internal power supply, you can replace the removable power supply without powering down the switch.

Warning

Be sure to disconnect all power cables before you disconnect the chassis ground wire.

Warning

Make sure that the AC power supply circuit is not overloaded. Use proper over-current protection, such as a circuit-breaker, to prevent over-current conditions.

To remove and replace an AC power supply, follow these steps:

1. Disconnect the AC power cord from the wall outlet and from the power supply.
2. If necessary, remove a blank panel from the back of the switch.
3. Note the orientation of the installed power supply, and the location of the latching tab at the right of the unit.
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 Replaceable AC Power Supply

   

   Removing a Replaceable AC Power Supply

   

5. Carefully slide the power supply all the way into the power supply bay (see Installing a Replaceable AC Power Supply

   

   Installing a Replaceable AC Power Supply

   

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

   Do not slam the power supply into the switch.

   

   Note

   If power supplies are not installed in all power supply bays, be sure to install a cover over the unoccupied bay. Unoccupied bays must always be covered to maintain proper system ventilation and EMI levels.
7. 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.

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