Juniper T640 Hardware Manual page 257

Copyright © 2017, Juniper Networks, Inc.
Switch the circuit breakers on the power supply faceplate to the
5.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
6.
Remove the nut and washer from the power terminal studs for
7.
is not supported for the T640 router. If no washers and nuts are already
INPUT 2
installed, they should be in the accessory box.
Secure the cable lug on the DC power cable to the terminal studs for
8.
INPUT 1 , first with a washer, then with a nut (see
(11 mm) nut driver or wrench to tighten the nut. Apply between 23 lb-in. (2.6 Nm) and
25 lb-in. (2.8 Nm) of torque to each nut):
Secure each positive (+) DC source power cable lug to a
a.
Secure each negative (–) DC source power cable lug to a
b.
NOTE:
INPUT 0
in slot PEM0
feed A, and
INPUT 0
in slot must be powered by dedicated power feeds derived from feed
PEM1
B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
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.
Loosen the captive screw or screws on the cable restraint on the right edge of the
9.
power supply faceplate.
Route the DC power cables through the cable restraint.
10.
Tighten the cable restraint captive screw or screws to hold the power cables in place.
11.
Figure 99 on page
and on the three-input 240-A DC power supply
INPUT 1
must be powered by dedicated power feeds derived from
and on the three-input 240-A DC power supply
INPUT 1
is not used for the T640 router.
INPUT 2
Chapter 22: Providing Power to the T640
position (
OFF
INPUT O and INPUT 1
INPUT O
224). Use a 7/16-in.
(return) terminal.
RTN
(input) terminal.
–48V
and to indicate
(+) (–)
).
O
.
and
223