Figure 119: Attaching The Dc Power Cable - Juniper T4000 Hardware Manual

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Verify that a licensed electrician has attached cable lugs to the power cables that you
6.
supply.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
7.
Remove the nut and washer from each power terminal stud.
8.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
Attach the lugs on the DC source power cables to the terminal studs.
9.
Attach the negative (–) DC source power cable lug to the
a.
Attach the positive (+) DC source power cable lug to the
b.
Secure the cable lugs to the terminal studs, first with a washer, then with a nut (see
Figure 119 on page 261). Use a 7/16-in. (11 mm) nut driver to tighten the nut. Apply
between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
CAUTION: You must use an appropriate torque-controlled tool to tighten
the nuts. Applying excessive torque damages the terminal studs and the
power supply. The absolute maximum torque that may be applied to this
nut is 45 lb-in. (5.0 Nm).

Figure 119: Attaching the DC Power Cable

Cable lug
Locking
washer
Nut
Loosen the captive screws on the cable restraint on the right edge of the power supply
10.
faceplate.
Route the DC power cables through the cable restraint.
11.
Tighten the cable restraint captive screws to hold the power cables in place.
12.
Verify that the power cabling is correct, that the power cables do not touch or block
13.
access to other hardware components, and that they do not drape where people
could trip on them.
Replace the clear plastic cover over the terminal studs on the faceplate.
14.
Chapter 19: Replacing T4000 Router Hardware Components
Terminal studs
and to indicate
(+) (–)
–48V (input) terminal.
(return) terminal.
RTN
261