Removing and Replacing the DC Power Supply

Chapter 3 Installing the Cisco ASR 903 Router

Installing the Power Supply

Step 1 Follow the steps to remove the power supply unit if installed in the chassis. See Removing and Replacing the DC Power Supply, page 3-26.

Step 2 Locate the T-shaped terminal block plug on the DC power supply unit. See Figure 1-3.

Step 3 Use a wire-stripping tool to strip the ends of each of the two wires coming from the DC-input power source to 0.27 inch (6.6 mm) ± 0.02 inch (0.5 mm) and the wire for grounding. Do not strip more than

0.29inch (7.4 mm) of insulation from the wire. Stripping more than the recommended amount of wire can leave behind exposed wire from the terminal block after installation.

Step 4 Prepare the cables by attaching the lugs to the cables.

Step 5 Identify the ground, positive, and negative feed positions for the terminal block connection. The recommended wiring sequence is

•Negative (-) lead wire (top)

•Ground lead wire (left)

•Positive (+) lead wire (right)

Step 6 Insert the lugged end of the cables to the connector and secure the cables using the captive screws.

Note The recommended torque for securing the captive screws is 0.7 N-m.

Step 7 Ensure that the terminal block plug is fully seated in the terminal block header on the DC power supply panel. See Installing the DC Power Supply, page 3-21for installing the power supply unit into the chassis.

Activating the DC Power Supply

Perform the following procedure to activate the DC power supply:

Step 1 Remove the tape from the circuit-breaker switch handle, and restore power by moving the circuit-breaker switch handle to the On () position.

Step 2 Verify power supply operation by checking if the power supply front panel LEDs are in the following states:

•INPUT OK LED is green

•OUTPUT FAIL LED is green

If the LEDs indicate a power problem, see Chapter 5, “Troubleshooting.”

If you are installing a redundant DC power supply, ensure that each power supply is connected to a separate power source in order to prevent power loss in the event of a power failure.

If you are installing a redundant DC power supply, repeat these steps for the second power source.