Installing An Mx2000 Router Three-Phase Wye Ac Power Distribution Module - Juniper MX2020 Hardware Manual

NOTE: Each PDM slot not occupied by a AC PDM must be covered by a PDM blank panel.

Installing an MX2000 Router Three-Phase Wye AC Power Distribution Module

Each three-phase wye AC PDM weighs approximately 12 lb (5.44 kg). To install a three-phase wye AC
PDM:
WARNING:
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 position,
and tape the switch handle of the circuit breaker in the off position.
CAUTION:
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 convert
to a DC configuration while the system is on.
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 installation process.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis.
3. [Optional]—If you are switching from a DC PDM to an AC PDM, see
Between AC and DC Power" on page 433
bar of the power distribution unit (PDU) cage to AC.
Before performing AC power procedures, ensure that power is removed
To maintain proper cooling and prevent thermal shutdown of the operating
for instructions on how to change the setting on the internal
"Converting an MX2000 Router
377