Figure 101: Connecting DC Power Cables
g006353
Terminal studs
Cable lug
Locking
washer
Nut
Figure 102: Connecting Negative (–) DC Power Cables to INPUT 0, INPUT 1,
INPUT 3, and INPUT 4
9. Replace the smallest cable restraint on the far right, and tighten the captive screw to
hold the power cables for INPUT 0, INPUT 1, INPUT 3, and INPUT 4 in place.
10. Route the negative (–) DC source power cables for INPUT 2 and INPUT 5 through the
middle cable restraint. The middle cable restraint is marked as follows from top to
bottom: INPUT 2, RTN 2, RTN 5, and INPUT 5.
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 –48 V (input) terminals
on the right. 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.
229Copyright © 2017, Juniper Networks, Inc.
Chapter 22: Providing Power to the T640
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