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

MX2020 3D Universal Edge Router Hardware Guide

Installing an MX2020 Three-Phase Delta AC Power Distribution Module

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NOTE: Each PDM slot not occupied by a AC PDM must be covered by a PDM
blank panel.
Before you install a three-phase delta AC PDM, be aware of the following:
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
position, and tape the switch handle of the circuit breaker in the
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.
Each three-phase delta AC PDM weighs approximately 12 lb (5.44 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 ( O ) the PSMs that are powered from only the AC PDMs being removed.
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.
Figure 166 on page 325).
OFF
position.
OFF
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