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## Related Documentation

- Required Tools for Maintaining the CTP Platform
- Storing CTP Modules and Other Components
- Cleaning the CTP Platform

# Replacing an AC Power Supply

Before you remove a power supply, be aware of the following:

- The minimum number of power supplies must be present in the router at all times.
- To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.
- After powering off a power supply, wait at least 60 seconds before turning it back on.

To remove an AC power supply (see Figure 1 for a representative AC power supply at the rear of the chassis):

1. Switch off the dedicated customer site circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the instructions for your site.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
3. If the chassis has a power switch, move it to the off (O) position.
4. Unplug the power cord from the power source receptacle.
5. Unplug the power cord from the appliance inlet in the chassis above the power supply.
6. The AC power supply has a pull handle and a locking tab. Press the locking tab to the right while you pull the unit out using the handle.

Figure 1: Replacing an AC Power Supply

To install an AC power supply (see Figure 1):

1. Move the AC input switch next to the appliance inlet on the power supply to the off (O) position.
2. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate should be flush with any adjacent power supply faceplate or blank installed in the power supply slot.
3. Tighten both captive screws at the bottom of the power supply.
4. Attach the power cord to the power supply.
5. Attach the power cord to the AC power source, and switch on the dedicated customer site circuit breaker. Follow the instructions for your site.
6. If the chassis has a power switch, move it to the on (|) position.
7. Observe the status LEDs on the power supply faceplate. If the power supply is correctly installed and functioning normally, the AC OK and DC OK LEDs light steadily, and the PS FAIL LED is not lit.

## Related Documentation

- Required Tools for Maintaining the CTP Platform
- Storing CTP Modules and Other Components
- Cleaning the CTP Platform

#### Published: 2011-01-31

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