Juniper MX2020 Hardware Manual page 269

Reinstalling the Power Distribution Modules After Installing the MX2020 In a Rack
Copyright © 2015, Juniper Networks, Inc.
Reinstalling the MPCs After Installing the MX2020 In a Rack on page 243
6.
Reinstalling the CB-REs After Installing the MX2020 In a Rack on page 244
7.
To reinstall the AC or DC PDMs, follow this procedure for each PDM (see
Figure 107 on page 238 and
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 a AC-powered router, move the AC circuit breaker on the power source to the off
2.
( ) position. For a DC-powered router, move the DC circuit breaker on the power
O
source to the off ( O ) position.
We recommend this precaution even though the PDMs are not connected to power
sources.
Take each PDM to be installed out of its electrostatic bag, and identify the slot on the
3.
PDM where it will be connected.
Turn the DC power switch to the off (
4.
PDM that is being reinstalled.
Using both hands, grasp the two handles and slide the PDM partway into the chassis.
5.
Align both locking levers with the openings in the chassis, and simultaneously close
6.
them to fully seat the PDM.
Tighten both captive screws on the locking levers. Apply between 10 lb-in. (1.13 Nm)
7.
to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
NOTE: The three-phase delta or wye AC PDM terminal blocks will be flipped
depending on which slot the PDMs gets plugged into.
Figure 108 on page 238):
O ) position on all PSMs that are zoned for the
Chapter 18: Installing the Router
237