Cisco Systems 9000 Manual De Usuario

5-19

Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide

Chapter 5 Replacing Cisco ASR 9000 Series Router Components

Removing and Replacing Power System Components

Disconnecting DC Power

Caution

It is not necessary to disconnect all power from the router to replace components, including power
modules. See

Removing and Replacing Power System Components, page 5-12

Follow these steps to disconnect an individual DC power source from a power tray (

Figure 3-21

for

version 1 DC power,

Figure 3-22

for version 2 DC power, or

Figure 3-23

for version 3 DC power):

Step 1

Power off the circuit breaker assigned to the DC power source you are disconnecting.

Caution

To ensure that power remains off while you are performing this procedure, lock-out/tag-out the circuit
breaker switch in the STANDBY (0) position until you are ready to turn it on.

Step 2

Remove the clear plastic safety covers that fit over the DC power connection terminal studs.

Caution

To prevent injury and damage to the equipment, always remove the source DC power cables and ground
from the power tray terminals in the following order: (1) negative (–), (2) positive (+), (3) ground.

Step 3

Disconnect the DC power cables from their terminals in the following order and note the color of each
cable (

Figure 3-21

for version 1 DC power,

Figure 3-22

for version 2 DC power, or

Figure 3-23

for

version 3 DC power):

Negative (PWR) cables first.

Positive (RTN) cables next.

Ground cable last.

Step 4

Repeat

Step 1

through

Step 3

for the other power tray, if installed.

If it becomes necessary to disconnect all DC power from the router, follow these steps (

Figure 3-21

for

version 1 DC power,

Figure 3-22

for version 2 DC power, or

Figure 3-23

for version 3 DC power):

Note

This procedure describes how to disconnect DC power from all power modules in a single DC power
tray. The procedure is the same for each DC power tray, if more than one is installed.

Caution

If only one power tray is installed, performing the following procedure turns off all power to the router.

Step 1

Set the power tray switch to the STANDBY (0) position.

Step 2

Power OFF (0) the circuit breaker assigned to the DC power source you are disconnecting.

Caution

To ensure that power remains off while you are performing this procedure, lock-out/tag-out the circuit
breaker switch in the OFF (0) position until you are ready to turn it on.