Cisco N9164E-NS4-O Hardware Installation Guide

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Replace a power supply module

Updated: May 29, 2026

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Overview

This topic introduces the essential requirements for replacing switch power supplies, including the need to maintain consistent power source types and airflow directions for operational continuity.

The switch requires two power supplies for redundancy. One power supply provides the necessary power for operation. You can replace the other power supply during operation if the new power supply has the same airflow direction as the other modules in the chassis.

Replace a power supply with another supported power supply that has the same power source type as the other installed power supply. Additionally, the airflow direction of the power supply must match or conform to the airflow direction of the installed fan modules. To determine the airflow direction used by the switch, refer to the coloring of the fan modules.

Remove an AC power supply

To disconnect the power supply from its power cables, shut off the power from the power source and disconnect the connector for the power cables.

Procedure

1.

Remove the power cable from the power supply: Press the tab on the Anderson Power SAF-D-Grid connector, then pull the cable and connector out of the power supply.

Verify that the LEDs turn off on the power supply that you are removing.

2.

While pressing the release latch toward the power supply handle, grasp the handle.
3.

Place your other hand under the power supply to support it as you slide it out of the chassis.

Caution

Do not touch the electrical connectors on the back side of the module. Ensure that nothing comes into contact with or damages the connectors.

Install an AC power supply

You can replace one power supply while the other one provides power to the switch.

Note

If the power supply that you are replacing has a different color handle than the replacement power supply, verify that it has or will have the same airflow direction as the other modules in the switch.

If you use n+n power redundancy, there must be a separate power source for each power supply installed in the chassis. Power sources must be of the same type. Do not mix AC and DC power sources for the same switch. Otherwise, only one power source is required.

Ensure the chassis is connected to earth ground when installing the replacement module. Typically, the chassis is grounded by its metal-to-metal connection to a grounded rack. If you need to ground this chassis by another means, see Ground the chassis.

Procedure

1.

With one hand underneath the replacement power supply and the other hand holding the handle, turn the power supply so that its release latch is on the side. Align the back end of the power supply (the end with the electrical connections) to the open power supply slot. Carefully slide the power supply all the way into the slot until it clicks into place.

Note

If the power supply does not fit into the open slot, turn the module over. Slide it into the open slot.

2.

Test the installation by attempting to pull the power supply out of the slot without using the release latch.

If the power supply does not move out of place, it is secured in the slot. If the power supply moves, carefully press it all the way into the slot until it clicks into place.

3.

Insert the Anderson SAF-D-Grid power supply cord connector into the power supply inlet. Ensure the connector is locked. Gently tug on the cord near the connector to ensure the locking tab is engaged.

4.

Verify that the other end of the power cable is connected to the appropriate power source for the power supply.

5.

Verify that the power supply is operational by making sure that the power supply LED is green.