Installing An Mx2020 Dc Power Supply Module - Juniper MX2020 Hardware Manual

Installing an MX2020 DC Power Supply Module

Copyright © 2015, Juniper Networks, Inc.
Before you install a PSM, be aware of the following:
NOTE: The DC PSM is hot-swappable when a minimum number of PSMs
installed and operational.
WARNING: The DC PSMs have no circuit breakers that can physically
disconnect DC current from the router. After DC feeds have been connected
to the PDM, the DC voltage is always present on the power midplane and is
distributed to the PSM connectors on the power midplane.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the
operating PSM, each PSM slot must contain either a PSM or a blank panel.
If you remove a PSM, you must install a replacement PSM or a blank panel
shortly after the removal.
NOTE: After powering on a PSM, wait at least 60 seconds before turning it
back off.
To install a DC PSM (see Figure 154 on page
With one PSM installed and operational, install an additional PSM with the power
1.
supply switch in the off (
CAUTION: If there is only one PSM installed and operational, the power
supply switch must be placed in the off (
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
While grasping the handle on the PSM faceplate with one hand, use your other hand
3.
to guide the power supply module into the chassis.
Tighten the captive screws on the PSM faceplate. Apply between 10 lb-in. (1.13 Nm)
4.
to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
Turn on the power switch to the on (
5.
Verify that the
PWR OK
6.
Chapter 22: Installing and Replacing Components
306):
) or in the on ( ) position.
O |
| ) position.
LED is lit steadily green.
O ) position.
305