Juniper MX960 Hardware Manual page 324

MX960 3D Universal Edge Router Hardware Guide
294
Secure each power cable lug to the terminal studs, first with the split washer, then
10.
with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to
each nut (see Figure 106 on page
7/16-in. (11 mm) torque-controlled driver or socket wrench.)
a. Attach the positive (+) DC source power cable lug to the
b. Attach the negative (–) DC source power cable lug to the
CAUTION: Ensure that each power cable lug seats flush against the surface
of the terminal block as you are tightening the nuts. Ensure that each nut
is properly threaded onto the terminal stud. The nut should be able to spin
freely with your fingers when it is first placed onto the terminal stud.
Applying installation torque to the nut when improperly threaded may
result in damage to the terminal stud.
CAUTION: The maximum torque rating of the terminal studs on the DC
power supply is 58 lb-in. (6.5 Nm). The terminal studs may be damaged
if excessive torque is applied. Use only a torque-controlled driver or socket
wrench to tighten nuts on the DC power supply terminal studs.
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.
NOTE: The DC power supplies in slots
by dedicated power feeds derived from feed
in PEM2 and
from feed . This configuration provides the commonly deployed
B
redundancy for the system. For information about connecting to DC power
sources, see
on page 169.
Loosen the captive screw on the cable restraint on the lower edge of the power supply
11.
faceplate.
Route the positive and negative DC power cables through the left and right sides of
12.
the cable restraint.
297). Do not overtighten the nut. (Use a
PEM3 must be powered by dedicated power feeds derived
"Electrical Specifications for the MX960 DC Power Supply"
(return) terminal.
RTN
(input) terminal.
–48V
and to indicate
(+) (–)
and must be powered
PEM0 PEM1
, and the DC power supplies
A
Copyright © 2017, Juniper Networks, Inc.
feed
A/B