Install a DC Power Supply

To install a DC power supply, follow this procedure (see Figure 37 and Figure 38):

1. Verify that there is no power flowing to the power supply from the external power source, so that the voltage across the leads of the power cables is 0 V. Ensure that there is no chance that the cable leads might become active during the procedure.
2. Verify that the power switch for the power supply (located on the power supply faceplate) is in the OFF (O) position.
3. Verify that the grounding cable is attached to the chassis and properly connected to an earth ground.
4. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Prevent Electrostatic Discharge Damage.
5. Grasp the handle on the power supply faceplate with one hand and place the other hand under the supply to support it.
6. Align the rear of the supply with the slide guides inside the chassis and slide the supply into the chassis until it contacts the midplane.
7. Tighten (but do not overtighten) the thumbscrews on the power supply faceplate. Turn both thumbscrews simultaneously and at about the same rate (turning them alternately or at very different rates can cause the power supply to become lodged in the slot, making it difficult to turn the screws).
8. If necessary, strip a short section of the protective cladding from the end of each power cable so that the metal core can come in direct contact with the quick-connect terminal.
9. Thread the power cables through the hook located on the faceplate to the right of the quick-connect terminals.
10. Insert the exposed end of each power cable straight into the appropriate quick-connect terminal:
    • Insert the positive (+) source cable into the return terminal, which is labeled RTN.
    • Insert the negative (–) source cable into the input terminal, which is labeled –48V.
11. Using a 3-mm flat-blade screwdriver, turn the screw on each quick-connect terminal clockwise to tighten the terminal connector around the cable.
12. Verify that the DC source power cabling and the grounding cabling are correct, that they are not touching or blocking access to router components, and that they do not drape where people could trip on them.
13. Turn on the DC power source so that voltage flows to the power supply.
14. Press the switch on the power supply faceplate to the ON ( | ) position and engage the safety interlock lever below the power switch.Verify that the blue OUTPUT OK LED eventually lights steadily.

    After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off. If the router is completely powered down when you power on the power supply, the Routing Engine boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power down the router again, first issue the CLI request system halt command. For more information, see Disconnect AC Power from the Router or Disconnect DC Power from the Router. After a power supply is powered on, it can take up to 60 seconds for status indicators—such as LEDs on the power supply and show chassis commands—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

Copyright © 1998-2003, Juniper Networks, Inc. All Rights Reserved.