Connect Power To A Seven-Feed Dc Power Distribution Module - Juniper MX2020 Hardware Manual

Connect Power to a Seven-Feed DC Power Distribution Module

Copyright © 2015, Juniper Networks, Inc.
Move the safety retention bar downwards and tight the captive retention screws.
5.
Connect the powers cords to the AC PDM.
6.
Verify that the power cords are not touching or blocking access to router components,
7.
and that it does not drape where people could trip on it.
WARNING: Do not touch the power connectors on the PDM. They can contain
dangerous voltages.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis. For more information about ESD,
see the
MX2010 3D Universal Edge Router Hardware Guide
NOTE: If the DC PSMs are installed in the router, make sure the power
switch is turned to the off (
Ensure that the voltage across the DC power source cable leads is 0 V and that there
2.
is no chance that the cable leads might become active during installation.
Remove the DC PDM from the electrostatic bag.
3.
Using both hands, slide the PDM part way into the chassis.
4.
Open the two locking levers on either side of the PDM, and align them with the openings
5.
in the chassis.
Using both hands, push firmly on both spring loaded levers until the PDM is fully seated
6.
in the chassis slot. The PDM faceplate should be flush. Tighten both captive screws.
NOTE: Make sure the DC circuit feed switch on the PDM faceplate matches
the current rating amperage, (
inputs of this PDM, and that selecting 60A reduces the available power
output capacity of the PSMs supplied by this PDM.
Loosen the captive screws on the clear plastic cable restraint protecting the terminal
7.
studs on the faceplate of the PDM.
Secure the power cable lugs to the terminal studs, first with the split washer, then
8.
with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) torque to each
nut (see Figure 129 on page
torque-controlled driver or socket wrench.).
Table 67 on page 179 describes the DC operating range specifications.
Attach the positive (+) DC source power cable lug to the
a.
Attach the negative (–) DC source power cable lug to the
b.
Chapter 19: Connecting the Router to Power
O ) position.
) or (
60A 80A
272). Do not overtighten the nut. (Use a 7/16-in. [11 mm]
.
). This switch applies to all
(return) terminal.
RTN
(input) terminal.
–48V
271