Connecting Power To A Dc-Powered Router - Cisco ASR 9000 Series Installation Manual

Connecting Power to the Router

Connecting Power to a DC-Powered Router

This section contains the procedures to connect the DC source power cables to a DC-powered router.
The color coding of source DC power cable leads depends on the color coding of the site DC power
source. Because there is no color code standard for source DC wiring, you must be sure that power
source cables are connected to the power module with the proper positive (+) and negative (–) polarity:
•
•
DC power modules contain circuitry to trip the breaker on the power module if the power module detects
Caution
a reverse polarity condition. No damage should occur from reverse polarity, but you should correct a
reverse-polarity condition immediately.
The length of the cables depends on the location of your router in relation to the source of DC power.
Note
These cables and the cable lugs used to attach the cables to the router chassis are not available from Cisco
Systems. They are available from any commercial cable vendor. For more information on site power and
source DC cable requirements, see the
Caution To ensure that power remains off while you are performing this procedure, lock-out/tag-out the DC
circuit breaker switch in the off (0) position until you are ready to turn it on.
Follow these steps to connect the DC source power cables to a DC power tray:
Verify that the power tray switch is set to the OFF (0) position.
Step 1
Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
Step 2
Connect the DC power cables in the following order (see
Step 3
Figure 3-23
a.
b.
c.
Repeat
Step 4
To prevent injury and damage to the equipment, always attach the ground and source DC power cable
Caution
lugs to power tray terminals in the following order: (1) ground to ground, (2) positive (+) to positive (+),
(3) negative (–) to negative (–).
Do not overtighten the nuts that secure the DC power cables to the power tray terminals. Using the 7/16
Caution
hex socket and torque wrench the nuts should be tightened to a torque of 45 to 50 in-lb.
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
3-28
In some cases, the source DC cable leads might have a positive (+) or a negative (–) label. This is a
relatively safe indication of the polarity, but you must verify the polarity by measuring the voltage
between the DC cable leads. Be sure that the positive (+) and negative (–) cable leads match the
positive (+) and negative (–) labels on the power module when making the measurement.
Green (or green and yellow) cable typically indicates that it is a ground cable.
for version 2 power):
Ground cables first.
Positive cables next.
Negative cable last.
Step 3 for the other power modules installed in the tray.
Chapter 3
"Power Connection Guidelines" section on page
Figure 3-21
Installing Cards and Modules in the Chassis
1-36.
for version 1 power and