Disconnecting Dc Power - Cisco NCS 4000 Series Hardware Installation

Reconnecting AC Power
Procedure
Step 1 Set the power switch at the rear of the AC power tray to the OFF (0) position.
Step 2 Power off (0) the circuit breakers assigned to the AC power sources that you are disconnecting.
Warning
Step 3 Loosen the retainer bracket that holds the AC power cords to the power tray receptacle.
Step 4 Unplug the AC power cords from the power tray receptacles.
Reconnecting AC Power
To reconnect an individual AC power cord to a power tray, see
on page 184

Disconnecting DC Power

It is not necessary to disconnect all power from the chassis to replace components, including power
Caution
modules. See
Follow these steps to disconnect an individual DC power source from a power tray:
Procedure
Step 1
Power off the circuit breaker assigned to the DC power source you are disconnecting.
Warning
Step 2
Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
Warning
Step 3 Disconnect the DC power cables from their terminals in the following order and note the color of each cable:
a) Negative (PWR) cables first.
b) Positive (RTN) cables last.
Step 4 Repeat Step 1 through Step 3 for the other power module distribution that needs to be removed.
What to Do Next
If it becomes necessary to disconnect all DC power from the chassis, follow these steps:
Hardware Installation Guide for Cisco NCS 4000 Series
190
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.
Removing and Replacing Chassis Components, on page 235
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.
To prevent injury and damage to the equipment, always remove the source DC power cables from
the power tray terminals in the following order : (1) negative (–), (2) positive (+).
Installing Power Components
Connecting Power to an AC-Powered Chassis,