Connecting An Mx2020 Dc Power Distribution Module Cable - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide

Connecting an MX2020 DC Power Distribution Module Cable

268
WARNING: Before performing DC power procedures, disconnect all power
sources. To ensure that all power is
panel board that services the DC circuit, switch the circuit breaker to the
position, and tape the switch handle of the circuit breaker in the
To connect a power cable for a DC PDM:
Locate a replacement power cable that meets the specifications defined in
1.
DC Power Subsystem Electrical Specifications" on page
Verify that a licensed electrician has attached a cable lug to the replacement power
2.
cable.
Verify that the –48V LED is off.
3.
Secure the power cable lug to the terminal studs, first with the first with the flat washer,
4.
then the 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
the nut. (Use a 7/16-in. [11 mm)] torque-controlled driver or socket wrench.)
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
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
excessive torque is applied. Use only a torque-controlled driver or socket
wrench to tighten nuts on the DC PDM terminal studs.
, locate the circuit breaker on the
OFF
179.
Figure 128 on page 269). Do not overtighten
Copyright © 2015, Juniper Networks, Inc.
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position.
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"MX2020