Figure 127: Attaching The Dc Power Cable - Juniper T4000 Hardware Manual

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Tighten the captive screws at the lower corners of the power supply faceplate to
5.
secure the power supply in the chassis.
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 127 on page 311). 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 127: 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.
Chapter 31: Replacing Power System Components
Terminal studs
and to indicate
(+) (–)
(input) terminal.
–48V
(return) terminal.
RTN
311