Maintain the Power Supplies

To maintain the power supplies, follow these guidelines:

• Make sure that the power and ground cables on each DC power supply are arranged so that they do not obstruct access to the other power supply or to the Routing Engine.
• Routinely check the LEDs on the power supply faceplate. The green OK LED indicates that the power supply is functioning normally; the red FAIL LED indicates a power supply fault. For more information about the power supply LEDs, refer to Power Supply LEDs.
• Issue the following CLI command to check the status of the power supplies. As shown in the sample output, the value OK in the Status column indicates that the power supply is operating normally:

user@host> show chassis environment

    Class Item                   Status     Measurement

    Power Power Supply A         OK 

          Power Supply B         OK 

    . . . 

For further description of the output from the command, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.

• Check the red and yellow alarm LEDs and the LCD on the craft interface. Power supply failure or removal triggers an alarm that causes one or both of the LEDs to light and an error message to appear on the LCD. You can display the error messages remotely by issuing the following CLI command:

user@host> show chassis alarms

For a list of possible alarm messages, see Hardware and Interface Alarm Messages.

• Verify that the airflow to each supply is unobstructed.
• Verify that the power source has the proper current rating and that each power supply is connected to a separate power source.
• Verify that the cable or cord connecting the power supply to the external power source is securely in place and that there is no moisture accumulating near the router.
• Verify that the cable or cord from the power source to the router is not damaged. If the insulation is cracked or broken, replace the cable or cord immediately.
• Verify that the power cables or cord do not touch or obstruct access to other router components, and that they do not drape where people could trip on them.