Figure 124: Three-Phase Delta Ac Power Cord - Juniper MX2020 Hardware Manual

Copyright © 2013, Juniper Networks, Inc.
WARNING: Do not touch the power connectors on the PDM. They can contain
dangerous voltages.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the
operating power supply unit, each PDM slot must contain either a PDM or a
blank panel. If you remove a PDM, you must install a replacement PDM or a
blank panel shortly after the removal.
NOTE: After powering off a PDM, wait at least 60 seconds before turning
the circuit breaker to the
To remove a three-phase delta AC PDM:
Switch off the dedicated customer site circuit breakers to the PDM being remove.
1.
Make sure that the voltage across the AC power source cord is 0 V and that there is
no chance that the cord might become active during the removal process.
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.
Switch off ( ) the AC PSMs that are powered only from the AC PDMs being removed.
O
3.
NOTE: After powering off a PDM, wait at least 60 seconds before turning
it back on.
Remove the ESD grounding strap from the ESD point on the chassis, and attach it to
4.
an approved site ESD grounding point. See instructions for your site.
Disconnect the AC power cord (see
5.

Figure 124: Three-Phase Delta AC Power Cord

Chapter 13: Replacing MX2020 Router Hardware Components
position.
ON
Figure 124 on page 277) from the power source.
277