42
Removing the –48V DC Power Supply
Before you can remove a –48V DC power supply from the Cisco ASR 1002 Router, you must remove power from the power
supply.
Caution Make certain that the chassis ground is connected before you begin removing and installing the power supply.
To remove the –48V DC power supply from the Cisco ASR 1002 Router, follow this procedure:
Step 1 Slip on the ESD-preventive wrist strap that was included in the accessory kit.
Step 2 Place the power supply switch in the Standby position.
Step 3 Turn off the branch circuit breaker before touching terminal screws. Then start loosening terminal block screws to
remove wires.
Step 4 Remove the ground leads from the terminal block in this order.
a. Negative ground lead
b. Positive ground lead
c. Ground lead
Step 5 Unscrew all of the power supply captive installation screws.
Note Two power supplies must be installed in the chassis at all times to ensure sufficient cooling. The system fans are inside
the power supply units and must spin for cooling. Because all the system fans can be powered by one power supply, the
second power supply unit does not have to be powered on, but it must be installed.
Caution If you remove a power supply, the system can run for a maximum of five minutes before the system shuts down.
The fans and power elements are independent within the power supply. Therefore, it is not required that the
replacement power supply be energized within five minutes. The only requirement is that the power supply be
installed in the chassis, which energizes the fans and maintains proper system cooling.
Step 6 Grasping the power supply handles, pull the power supply from the chassis.
Step 7 Replace the –48V DC power supply within five minutes or the system will shutdown.
You have completed the procedure for removing a –48V DC power supply from the Cisco ASR 1002 Router. For replacing the
–48V DC power supply into the Cisco ASR 1002 Router, see Connecting –48V DC power to the Cisco ASR 1002 Router, page
18.
Removing the +24V DC Power Supply
This section provides information about removing a +24V DC power supply from the Cisco ASR 1002 Router.
Before you begin, read the following notices:
• The labeling displays +27V DC INPUT. This labeling describes the nominal voltage provided at a cell site.
• Observe the polarity location—Unlike the polarity labels of the –48V DC power supply (ground, positive, negative), the
polarity labels on the +24V DC are ground, negative, positive as shown in Figure 27 from right to left as they appear on
the actual power supply unit.
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