Disconnecting Dc Power - Cisco NCS 4016 Installation Manual

Chapter 4 Installing Power Components

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:
Step 1 Power off the circuit breaker assigned to the DC power source you are disconnecting.
To ensure that power remains off while you are performing this procedure, lock-out/tag-out the circuit
Warning
breaker switch in the OFF (0) position until you are ready to turn it on.
Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
Step 2
To prevent injury and damage to the equipment, always remove the source DC power cables from the
Warning
power tray terminals in the following order: (1) negative (–), (2) positive (+).
Disconnect the DC power cables from their terminals in the following order and note the color of each
Step 3
cable:
a.
b.
Repeat
Step 4
If it becomes necessary to disconnect all DC power from the chassis, follow these steps:
This procedure describes how to disconnect DC power from all power modules in a single DC power
Note
tray. The procedure is the same for each DC power tray, if more than one is installed.
If only one power tray is installed, performing the following procedure turns off all power to the chassis.
Caution
Set the power tray switch to the OFF (0) position.
Step 1
Power off (0) the circuit breaker assigned to the DC power source you are disconnecting.
Step 2
Warning 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.
Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
Step 3
To prevent injury and damage to the equipment, always remove the source DC power cables from the
Warning
power tray terminals in the following order: (1) negative (–), (2) positive (+).
Chapter 6, "Removing and Replacing Chassis Components."
Negative (PWR) cables first.
Positive (RTN) cables last.
Step 1 through Step 3 for the other power module distribution that needs to be removed.
Cisco Network Convergence System 4000 Series Hardware Installation Guide
Disconnecting AC or DC Power
4-29