Replace a Controller Power Supply

Power supplies, which exist in pairs, provide DC power to all of the Controller components. If one power supply fails, the other supply carries the full load. This situation creates a risk of Controller failure should the other power supply also fail.

A failed Controller can cause data paths to drop.

Prerequisites:

Deploy any rack anti-tilt mechanism before releasing the release buttons and extending the Controller.
Before handling a component, touch a grounded surface to discharge any static electricity.
Attach an electrostatic discharge (ESD) wrist strap to your wrist, and stand on an ESD mat while replacing components.
Make sure you have a similar replacement power supply available before you start the replacement procedure.
Initiate Guided Maintenance only when you are able to replace the power supplies immediately.

Each Controller has a pair of power supplies that are located at the back of the Controller. Power supplies are customer replaceable units (CRUs). Replacing a power supply does not require you to bring the Controller offline, provided that the other power supply is online and working. The following figure identifies the location of the Controller power supplies.

Figure 1: Power supply location

Legend

1 Power supply-1 (PS-1)

2 Power supply-0 (PS-0)

Note: To replace a power supply, you can access the faulted power supply from the back of the Controller module. To access the power supply located in the bottom slot (PS-0), the CMA clip must be disconnected to enable the power supply to clear the support arm.

Note: Replacing the power supply does not require you to slide the Controller into the extended rack position and can be performed while the Controller is in the rack position.

Note: Ensure that the power strain relief strap on the power supply is positioned correctly such that there is proper clearance and the power supplies can be re-inserted into the power supply compartment without interference.

Note: Ensure that the power cable is routed correctly and there is no interference with the Controller chassis.

Important! Do not remove the failed power supply until you have a replacement power supply to ensure proper airflow in the Controller.

Note: For fan replacement, the Replaceable Unit list displays the names of each fan. Each power supply contains one fan, and each fan module contains two fans. If a fan fails in a power supply, replace the power supply. If a fan fails in a fan module, replace the fan module. The following list identifies the names of the fans and the corresponding customer replaceable unit (CRU).

If the following fan fails: Replace the following CRU
Fan 0: Power supply 0
Fan 1: Power supply 1
Fans 2, 3: Fan module 0
Fans 4, 5: Fan module 1
Fans 6, 7: Fan module 2
Fans 8, 9: Fan module 3
Fans 10, 11: Fan module 4

Procedure Overview