3. Verify that a licensed electrician has attached appropriate cable lugs to the DC power
cables. See the DC power cable and lug specifications for your router for more
information.
4. Switch the power switch on the power supply faceplate to the standby position.
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Remove the nut and washer from each power terminal stud to be connected. If no
washers and nuts are already installed, they should be in the accessory box.
7. Remove the captive screws on all three cable restraints on the right edge of the power
supply faceplate (using a Phillips (+) screwdriver, number 2).
8. Route the negative (–) DC source power cables for INPUT 0, INPUT 1, INPUT 3, and
INPUT 4, over the smallest cable restraint on the far right. The cable restraint is marked
as follows top to bottom: INPUT 0, INPUT 1, INPUT 3, and INPUT 4,
NOTE: You must route the cables in the locations as marked to be able
to replace the clear plastic cover over the terminal studs.
Attach the negative (–) DC source power cable lugs to the –48V (input) terminals
on the right: INPUT 0, INPUT 1, INPUT 3, and INPUT 4. Secure the cable lugs to the
terminal studs, first with the washers, then with the nuts. Using a 7/16-in. (11 mm) nut
driver, tighten the nuts. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of
torque to each nut.
Figure 105: Connecting DC Power Cables
g006353
Terminal studs
Cable lug
Locking
washer
Nut
233Copyright © 2017, Juniper Networks, Inc.
Chapter 22: Providing Power to the T640
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