Cisco ASR 1000 Series Quick Start Manual page 41

You have removed an AC power supply from the Cisco ASR 1002-X Router and now must replace the AC power supply within
five minutes. For replacing the AC power supply into the Cisco ASR 1002-X Router, see Connecting AC Power to the Cisco
ASR 1002-X Router, page 15.
Removing the –48V DC Power Supply
Before you can remove a –48V DC power supply from the Cisco ASR 1002-X Router, you must remove power from the power
supply.
Make certain that the chassis ground is connected before you begin removing and installing the power supply.
Caution
To remove the –48V DC power supply from the Cisco ASR 1002-X Router, follow this procedure:
Slip on the ESD-preventive wrist strap that was included in the accessory kit.
Step 1
Step 2 Place the power supply switch in the Standby position.
Turn off the branch circuit breaker before touching terminal screws. Then start loosening terminal block screws to
Step 3
remove wires.
Remove the ground leads from the terminal block in this order.
Step 4
a. Negative ground lead
b. Positive ground lead
c. Ground lead
Unscrew all of the power supply captive installation screws.
Step 5
Four power supplies must be installed in the chassis at all times, with a minimum of two power supplies (one per zone)
Note
connected to the mains in order to power on the system and 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 must be connected.
If you remove a power supply from a system that has four power supplies that are connected and powered on, the
Caution
system can run only for a maximum of five minutes before shutting down. However, because the fans and power
elements are independent within the power supply, the replacement power supply does not have to be energized
within five minutes. The only requirement is that the power supply be installed in the chassis in order to energize
the fans and maintain proper system cooling.
Step 6 Grasping the power supply handles, pull the power supply from the chassis.
Replace the –48V DC power supply within five minutes or the system will shutdown.
Step 7
You have completed the procedure for removing a –48V DC power supply from the Cisco ASR 1002-X Router. For replacing
the –48V DC power supply into the Cisco ASR 1002-X Router, see Connecting –48V DC power to the Cisco ASR 1002-X
Router, page 16.
Removing the +24V DC Power Supply
This section provides information about removing a +24V DC power supply from the Cisco ASR 1002-X 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
the actual power supply unit.
Figure 24 from right to left as they appear on
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