Juniper MX960 Hardware Manual page 268

MX960 3D Universal Edge Router Hardware Guide
238
Let go of the locking pin in the release lever. Ensure that the pin is seated inside the
8.
corresponding hole in the chassis.
Remove the cover protecting the terminal studs on the faceplate.
9.
Remove the nut and washer from each of the terminal studs.
10.
Secure each power cable lug to the terminal studs, first with the split washer, then
11.
with the nut. Apply between 23 in-lb. (2.6 Nm) and 25 in-lb. (2.8 Nm) of torque to
each nut. Do not overtighten the nut. (Use a 7/16-in. [11-mm] torque-controlled driver
or socket wrench.)
a. On , attach the positive (+) DC source power cable lug to the
INPUT 0
terminal as shown in
feeds.
b. On INPUT 0 attach the negative (–) DC source power cable lug to the
terminal. Repeat this step for
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 36 in-lb. (4.0 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.
NOTE: The DC power supplies in slots
by dedicated power feeds derived from feed
in and
PEM2
from feed B . This configuration provides the commonly deployed
redundancy for the system. For information about connecting to DC power
sources, see
on page 169.
Verify that the power cabling is correct, that the cables are not touching, and that they
12.
do not block access to router components or drape where people could trip on them.
Replace the clear plastic cover over the terminal studs on the faceplate.
13.
Figure 74 on page 237. Repeat this step for
if using two feeds.
INPUT 1
must be powered by dedicated power feeds derived
PEM3
"Electrical Specifications for the MX960 DC Power Supply"
RTN
if using two
INPUT 1
–48V
and must be powered
PEM0 PEM1
A , and the DC power supplies
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(return)
(input)
A/B feed