Figure 211: Installing A Dc Power Distribution Module - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
460
Open both locking levers on either side of the PDM (see
5.
While holding both handles, guide the PDM until the locking levers are inserted into
6.
the chassis. With both hands push the locking levers simultaneously until the PDM is
fully seated into the chassis.

Figure 211: Installing a DC Power Distribution Module

Tighten both captive screws. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm)
7.
of torque to each screw. Do not overtighten the screws.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
8.
Remove the nut and washers from each of the terminal studs.
9.
Secure each power cable lug to the terminal studs, first with the flat washer, then the
10.
split washer, and then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in.
(2.8 Nm) of torque to each nut (see
nut. (Use a 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 it is improperly threaded may
result in damage to the terminal stud.
CAUTION: The maximum torque rating of the terminal studs on the DC
PDM is 25 lb-in. (33.89 Nm). The terminal studs may be damaged if
Figure 211 on page
Figure 212 on page 462). Do not overtighten the
RTN
–48V
Copyright © 2015, Juniper Networks, Inc.
460).
(return) terminal.
(input) terminal.