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Removing and Replacing the Cisco ASR 1002 Router Power Supplies
Unscrew the two power supply captive screws.
Step 5
Note
If you remove a power supply from a system that has four power supplies that are connected and powered
Caution
on, the 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.
Grasping the power supply handles, pull the power supply from the chassis.
Step 6
Replace the +24 VDC power supply within five minutes.
Step 7
This completes the procedure of removing a +24 VDC power supply from the Cisco ASR 1002 Router.
Replacing the +24 VDC Power Supply in Cisco ASR 1002 Router
The +24 VDC power supply uses a spring-loaded terminal block. The input terminal block requires
8 AWG multi-strand wiring to support input current. Features are provide for strain relieving the input
wires from the terminal block on the front panel. The recommended branch circuit breaker for the Cisco
ASR 1002 Router +24 VDC power supply is 40 A UL listed circuit breaker.
Before you begin, read these important notices about the +24 VDC power supply:
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Cisco ASR 1000 Series Aggregation Services Routers Hardware Installation Guide
14-86
Four power supplies must be installed in the chassis at all times, with a minimum of two power
supplies (one per zone) 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.
The labeling displays +27 VDC INPUT. This labeling describes the nominal voltage provided at a
cell site.
Observe the polarity—Unlike the polarity labels of the –48 VDC power supply (ground, positive,
negative), the polarity labels on the +24 VDC are ground, negative, positive as shown in
Figure 14-61
from right to left as they appear on the actual power supply unit.
The ground (GND) lead is always installed first and removed last.
The +24 VDC power supply uses a spring loaded terminal block; therefore have the recommended
screwdriver size available.
Review the diagrams to see how the wire is stripped and how the screwdriver is inserted at an angle
into the terminal block.
Have the following equipment available to install and remove the +24 VDC power supply:
–
3.5mm flat-blade screwdriver
8-gauge wire
–
Chapter 14
Removing and Replacing FRUs from the Cisco ASR 1000 Series Routers
OL-13208-11
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