Powering Down A Dc-Input Power Supply And Removing The Dc-Input Leads - Cisco 7304 Installation And Configuration Manual

Chapter 4 Removing and Installing the NSE

Powering Down a DC-Input Power Supply and Removing the DC-Input Leads

Before completing any of the following steps, and to prevent short-circuit or shock hazards,
Warning
ensure that power is removed from the DC circuit. To ensure that all power to the power supply is
OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit
breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Note that the power to the power supply should be off, not necessarily all power to the router. A
DC-Input power supply can be running when another power supply or fan module is being removed
or replaced.
When installing the unit, the ground connection must always be made first and disconnected last.
Warning
Before powering down the router, use the copy running-config startup-config command to save the
Note
router's running configuration to NVRAM or another file system.
The Cisco 7304 power supply switches have a standby symbol (a broken circle with a line through it)
and an on symbol (|) on the power switch. If only one power supply is installed in the router, the standby
symbol means off, as there is no other power supply to take over its function. If two power supplies are
installed, one is turned on, and the other power supply switch is set to the standby position, as it will be
activated automatically if the primary power supply fails.
To power down the DC-input power supply to the Cisco 7304 router and remove the DC-input power
leads from the DC-input power supply, complete the following steps:
Step 1 Place the standby switch on the DC-input power supply in the standby position.
Step 2 Ensure that power is removed from the DC circuit by turning off the circuit breaker or switch providing
power to the DC-input power supply.
If necessary, remove the cable tie that secures the DC-input power line input leads and ground lead to
Step 3
the power supply faceplate. Save the cable tie.
Using a 1/8-inch flat-blade screwdriver, loosen the screw above the –DC power line input lead
Step 4
receptacle and pull the lead from the connector. Repeat this step for the +DC power line input lead and
the ground lead.
Note
This completes the procedure for disconnecting DC-input power and removing the DC-input power leads
from the DC-input power supply.
OL-3967-01
The color coding of the DC-input power supply leads depends on the color coding of the DC
power source at your site. Typically, green or green/yellow is used for ground. Make certain
the lead color coding you choose for the DC-input power supply matches lead color coding
used at the DC power source.
Powering Down the Router and Disconnecting Input Power
Cisco 7304 Network Service Engine Installation and Configuration
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