Ac Power Supply Configurations; Figure 33: High-Capacity Ac Power Supply - Juniper MX240 Hardware Manual

AC Power Supply Configurations

Copyright © 2017, Juniper Networks, Inc.

Figure 33: High-Capacity AC Power Supply

WARNING: The router is pluggable type A equipment installed in a
restricted-access location. It has a separate protective earthing terminal
(sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the
grounding pin of the power supply cord. This separate protective earthing
terminal must be permanently connected to earth.
The MX240 high-capacity and normal-capacity power supplies each support either of
the following AC power configurations:
In the low-line (110 V) AC power configuration, the MX240 router contains either two
AC power supplies (nonredundant), located horizontally at the rear of the chassis in
slots PEM0 and PEM1 (left to right); or four AC power supplies (redundant), located in
slots through
PEM0 PEM3
supplies, and the third and fourth power supplies provide redundancy. Each AC power
supply provides power to all components in the router. When two power supplies are
present, they share power almost equally within a fully populated system. If one power
supply in a redundant configuration fails or is removed, the remaining power supplies
assume the entire electrical load without interruption. Two power supplies provide the
maximum configuration with full power for as long as the router is operational.
In the high-line (220 V) AC power configuration, the MX240 router contains one or two
AC power supplies, located horizontally at the rear of the chassis in slots
PEM2 (left to right). The high-line configuration requires one power supply, with the
second power supply providing redundancy. Each AC power supply provides power to
all components in the router. When two power supplies are present, they share power
almost equally within a fully populated system. If one power supply fails or is removed,
the remaining power supply assumes the entire electrical load without interruption.
One power supply can provide the maximum configuration with full power for as long
as the router is operational.
Chapter 7: Power System Components and Descriptions
(left to right). The low-line configuration requires two power
and
PEM0
91