Figure 106: 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, 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 cable in the location 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 INPUT 2 –48 V (input)
terminal on the right. Secure the cable lug to the terminal studs, first with the washer,
then with the nut. Using a 7/16-in. (11 mm) nut driver, tighten the nut. Apply between
23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
Figure 107: Connecting Negative (–) DC Power Cable to INPUT 2
11. Route the positive (+) DC source power cables for RTN 2 over 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,
Copyright © 2017, Juniper Networks, Inc.234
T640 Core Router Hardware Guide
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