Installing An Mx2020 Three-Phase Wye Ac Power Distribution Module - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide

Installing an MX2020 Three-Phase Wye AC Power Distribution Module

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Each three-phase wye AC PDM weighs approximately 12 lb (5.44 kg). To install a
three-phase wye AC PDM:
WARNING: Before performing AC power procedures, disconnect all power
sources. 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 position,
and tape the switch handle of the circuit breaker in the off position.
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.
NOTE: The PDMs are hot swappable in a redundant configuration. However,
you cannot switch from one type of PDU (AC or DC) to another while the
system is on.
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 AC PSMs and disengage all AC PSMs.
3. O
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.
Figure 168 on page 329).
Push the lock levers completely into 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.
Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the
8.
metal wiring compartment that protects the AC terminal block.
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