Module - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
280
NOTE: Each PDM slot not occupied by a AC PDM must be covered by a PDM
blank panel.
Installing an MX2020 Three-Phase Delta AC Power Distribution Module
Before you install a three-phase delta AC PDM, be aware of the following:
WARNING: Before performing AC power procedures, ensure that power is
removed from the AC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the AC circuit, switch the circuit
breaker to the OFF
in the position.
OFF
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 back on.
Each three-phase delta AC PDM weighs approximately 8.0 lb (3.62 kg). To install a
three-phase delta AC PDM:
Make sure that the voltage across the AC power source cord is 0 V and that there is
1.
no chance that the cord might become active during the installation 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 PSMs that are powered from only the AC PDMs being removed.
O
3.
NOTE: After powering off a PDM, wait at least 60 seconds before turning
it back on.
Pull the locking levers on either side of the faceplate away until they stop.
4.
Using both hands, slide the PDM into the chassis until you feel resistance (see
5.
127 on page 281).
Push the lock levers completely in until they make contact with the PDM faceplate.
6.
Tighten the two captive screws on the locking levers of the PDM faceplate to secure
7.
the PDM in the chassis.
position, and tape the switch handle of the circuit breaker
Copyright © 2013, Juniper Networks, Inc.
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