Juniper MX2008, Quick Start Manual

Page: 56 / 69

7.
Loosen the captive screws on the clear plastic cable restraint protecting the terminal
studs on the faceplate of the PDM.
8.
Secure each power cable lug to the terminal studs, first with the flat washer, then
with the split washer, and finally with the nut. Apply between 23 lb-in. (2.6 Nm) and
25 lb-in. (2.8 Nm) torque to each nut (see
Figure 40 on page 56 ). Do not overtighten
the 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 RTN (return) terminal.
b.
Attach the negative (–) DC source power cable lug to the
–48V
(input) terminal.
Table 9 on page 56 describes the DC operating range specifications.
Table 9: MX2008 DC Power System Input Voltage
Specification Item
Operating range: –40 through –72 VDC DC input voltage
Figure 40: Connecting Ground and DC Power Cables
D
g007053
Terminal
studs
Cable
lug
Nut
Split
washer
Grounding points
(on chassis)
Flat
washer
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 the nut is improperly threaded
might result in damage to the terminal stud.
Copyright © 2017, Juniper Networks, Inc. 56
MX2008 3D Universal Edge Router Quick Start