This procedure describes how to disconnect DC power from all power modules in a single DC power tray.
The procedure is the same for each DC power tray, if more than one is installed.
Note
If only one power tray is installed, performing the following procedure turns off all power to the chassis.
Caution
Disconnecting DC Power
Procedure
Step 1
Set the power tray switch to the OFF (0) position.
Step 2
Power off (0) 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 breaker switch in the OFF (0) position until you are ready to turn it on.
Warning
Step 3
Remove the clear plastic safety covers that fit over the DC power connection terminal studs.
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 (+).
Warning
Step 4
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 5
Repeat Step 1 through Step 4 for the other power tray, if installed.
Reconnecting DC Power
To reconnect DC power to a DC power tray, see
Connecting Power to a DC-Powered Chassis, on page 186
.
Powering On the Chassis
Follow these steps to turn on power to an AC-powered or DC-powered chassis:
Procedure
Step 1
Power on the circuit breaker to your power sources one at a time.
Step 2
Verify that the correct Power Input LED on each power module in the tray is lit (one input on the LED flashes
and both inputs on the LED are solid). Continue with steps 1 and 2 until all inputs have been verified.
On the DC power tray, the Power Input LED is lit solid green if both DC feeds are valid and blinks
green if only a single DC feed is valid.
Note
Hardware Installation Guide for Cisco NCS 4000 Series
191
Installing Power Components
Disconnecting DC Power
