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4-1
Cisco Nexus 3000 Series Hardware Installation Guide
OL-25338-04
4
Replacing Components
This chapter describes how to replace the field replaceable units (FRUs) on the Cisco Nexus 3000 Series
switch.
This chapter includes the following sections:
• Replacing a Power Supply, page 4-1
• Replacing a Fan Tray, page 4-4

Replacing a Power Supply

The Cisco Nexus 3000 Series switches support a front-end power supply that you can replace. The switch
requires only one power supply for operations, so you can hot swap the redundant power supply during
operations.
Caution Be sure that the replacement power supply has the correct direction of airflow, which means that it takes
in air from the cold aisle and exhausts air to the hot aisle. It must also have the same direction of airflow
as the other power supply (if installed) and fan tray. Otherwise, an overtemperature condition can occur.
This section includes the following topics:
• Removing an AC Power Supply, page 4-1
• Installing an AC Power Supply, page 4-2
• Removing a DC Power Supply, page 4-3
• Installing a DC Power Supply, page 4-4

Removing an AC Power Supply

Caution If you are using the Cisco Nexus 3000 Series switch with one power supply, removing the power supply
causes the switch to shut down. If the power supply is functioning, you can install a new power supply
in the second power supply slot (see the “Installing an AC Power Supply” section on page 4-2) and then
switch to using that power supply.