Disconnecting DC Power
Follow these steps to disconnect an individual DC power source from a power tray (Figure 2 for version 1
DC power, Figure 3 for version 2 DC power, or Figure 3 for version 3 DC power):
Procedure
Step 1 Power off the circuit breaker assigned to the DC power source you are disconnecting.
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.
Caution
Step 2 Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
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.
Caution
Step 3 Disconnect the DC power cables from their terminals in the following order and note the color of each cable
(Figure 2 for version 1 DC power, Figure 3 for version 2 DC power, or Figure 3 for version 3 DC power):
a) Negative (PWR) cables first.
b) Positive (RTN) cables next.
c) Ground cable last.
Step 4 Repeat Step 1 through Step 3 for the other power tray, if installed.
It is not necessary to disconnect all power from the router to replace components, including power
modules. See Removing and Replacing Power System Components, on page 12.
Caution
Disconnecting DC Power
If it becomes necessary to disconnect all DC power from the router, follow these steps (Figure 2 for version
1 DC power, Figure 3 for version 2 DC power, or Figure 3 for version 3 DC power):
Procedure
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.
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.
Caution
Step 3 Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
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.
Caution
Replacing Cisco ASR 9000 Series Router Components
19
Replacing Cisco ASR 9000 Series Router Components
Disconnecting DC Power
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