Cisco Systems NPE-175, NPE-225 manual Disconnecting DC-Input Power from a Cisco uBR7246 Router

Chapter 9 Removing and Installing the NPE or NSE

Removing and Replacing the NPE or NSE

Disconnecting DC-Input Power from a Cisco uBR7246 Router

To disconnect DC-input power from a Cisco uBR7346 router, complete the following steps.

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 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. Statement 322

Warning When you install the unit, the ground connection must always be made first and disconnected last. Statement 42

Step 1 At the rear of the router, check that the power switch on the power supply is in the off (O) position.

Step 2 Ensure that no current is running through the –V and +V leads. To ensure that all power 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.

Step 3 Use a 7-mm wrench or nut driver (or adjustable wrench) to loosen and remove the two M4 nuts from the strain-relief cover that secures the –V and the +V leads to the power supply faceplate. See Figure 9-4.

Figure 9-4 Removing the Strain-Relief Cover from a Cisco uBR7246VXR Router DC-Input Power Supply

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Power switch	6	–V lead
Power receptacle	7	+V lead

Network Processing Engine and Network Services Engine Installation and Configuration

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