Cisco 7304 Installation Guide - Page 55

Chapter 4 Removing and Installing the NSE Powering Down the Router and Disconnecting Input Power Powering Down a DC-Input Power Supply and Removing the DC-Input Leads Warning Before completing any of the following steps, and to prevent short-circuit or shock hazards, 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. Warning When installing the unit, the ground connection must always be made first and disconnected last. Note Before powering down the router, use the copy running-config startup-config command to save the 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 Step 2 Step 3 Step 4 Place the standby switch on the DC-input power supply in the standby position. 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 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 receptacle and pull the lead from the connector. Repeat this step for the +DC power line input lead and the ground lead. Note 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. 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 Cisco 7304 Network Service Engine Installation and Configuration 4-3