Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

Converting from DC to AC Power Supplies on an MX960 Router

 

The conversion of an MX960 router from AC to DC or DC to AC should be performed with the system completely powered off. A system cannot operate with a mix of AC and DC power supplies. This procedure assumes conversion from normal-capacity power supplies to high-capacity power supplies.

Remove MX960 normal-capacity DC power supplies for power supply in slots 0, 1, 2, 3 where present. All power supplies should be removed proceeding with the installation of the AC power supplies. To convert from DC to AC, use the following procedures.

To remove a normal-capacity DC power supply (see Figure 1):

  1. Switch off the dedicated customer site circuit breaker for the power supply being removed. Follow your site's procedures for electrostatic discharge (ESD).
  2. Move the DC circuit breaker on the power supply faceplate to the off (O) position.
  3. Verify that the INPUT OK LEDs on the power supply to be removed are not lit. Also verify that the BREAKER ON LED is not lit.
  4. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during the removal process.
  5. Remove the clear plastic cover protecting the terminal studs on the faceplate from the power supply in slot 0.
  6. Remove the nut and washer from each of the terminal studs. (Use a 7/16-in. [11-mm] nut driver or socket wrench.)
  7. Loosen the captive screw on the cable restraint on the lower edge of the power supply faceplate.
  8. Remove the cable lugs from the terminal studs.
  9. Carefully move the power cables out of the way.
  10. While grasping the handle on the power supply faceplate with one hand, use your other hand to pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever counterclockwise until it stops.
  11. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
  12. Pull the power supply straight out of the chassis (see Figure 1).Warning

    Do not touch the power connector on the top of the power supply. It can contain dangerous voltages.

  13. Repeat steps 1-12 for power supplies in slot 1, 2, and 3, where present.
    Figure 1: Removing a DC Power Supply from the MX960 Router
    Removing a
DC Power Supply from the MX960 Router

Use the following procedures to install the MX960 high-capacity AC power supplies for power supply in slots 0, 1, 2, and 3, where present.

Note

During the upgrade process, you can simultaneously run normal-capacity and high-capacity power supplies. However, it is recommended to upgrade all power supplies to high-capacity power supplies.

To install an MX960 high-capacity AC power supply, use the following procedure (see Figure 2).

  1. Verify that the power switch on the power supply is in the off  (O) position.
  2. Ensure that the release lever below the empty power supply slot is locked in the counterclockwise position (see Figure 2).
    Figure 2: MX960 with High-Capacity AC Power Supplies Installed
    MX960 with High-Capacity
AC Power Supplies Installed

    If necessary, pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever counterclockwise until it stops. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.

  3. On the power supply, rotate the metal cover away from the input mode switch to expose the switch.
  4. Move the input mode switch to position 0 for one feed or position 1 for two feeds (see Figure 3).
    Figure 3: MX960 AC Power Input Mode Switch
    MX960 AC Power
Input Mode Switch
    Caution

    Do not use a pencil, because fragments can break off and cause damage to the power supply.

  5. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate will protrude beyond the chassis.

    The small tab on the metal housing that is controlled by the release lever must be inside of the corresponding slot at the bottom of the power supply (see Figure 3). This tab is used to pull the power supply down in the chassis slot, prior to removing the power supply.

  6. While firmly pushing the handle on the power supply faceplate with one hand, use your other hand to pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever clockwise until it stops.
  7. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
  8. Locate a power cord with the type of plug appropriate for your geographical location (see AC Power Cord Specifications for the MX960 Router).
  9. Plug the power cord into the corresponding appliance inlet located in the chassis directly above the power supply. This is the recommend receptacle when using the power supply in one feed mode. If using the power supply in two-feed mode, plug the second power cord into the receptacle on the power supply.Note

    Each power supply must be connected to a dedicated AC power feed and a dedicated customer site circuit breaker.

  10. Dress the power cord appropriately. Verify that the power cord does not block the air exhaust and access to router components, and that they do not drape where people could trip on them.
  11. Move the AC input switch above the power supply to the on () position. This is the only switch you have to turn on if you are using the power supply in one feed mode. If using the power supply in two-feed mode, move the power switch on the power supply to the on position. Remember to turn on both switches when operating the power supply in two-feed mode.
  12. If the power supply is correctly installed and functioning normally, the AC1 OK, AC2 OK (two-feed mode only), and DC OK LEDs light steadily, and the PS FAIL LED is not lit. See Table 1.
  13. Repeat steps 1-12 for installing power supplies in slots 1, 2, and 3, where present

    Table 1: MX960 High-Capacity AC Power Supply LEDs

    Connected Inputs

    DIP Switch Position

    LEDs

    AC-1 OK

    AC-2 OK

    DC OK

    PS FAIL

    PDM connected, power supply disconnected

    0 (1 input)

    Green

    Off

    Green

    Off

    PDM disconnected, power supply connected

    0 (1 input)

    Off

    Green

    Green

    Off

    PDM connected, PS connected

    0 (1 input)

    Green

    Green

    Green

    Off

    PDM connected, PS disconnected

    1 (2 inputs)

    Green

    Off

    Off

    Red

    PDM disconnected, PS connected

    1 (2 inputs)

    Off

    Green

    Off

    Red

    PDM connected, PS connected

    1 (2 inputs)

    Green

    Green

    Green

    Off

    Note: PDM in the above table stands for Power Distribution Module.