Supplies - Juniper MX240 Hardware Manual

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Connecting Power to a DC-Powered MX240 Router with Normal-Capacity Power

Supplies

Copyright © 2017, Juniper Networks, Inc.
installed and functioning normally, the
LED is not lit.
PS FAIL
If any of the status LEDs indicates that the power supply is not functioning normally,
repeat the installation and cabling procedures .
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on. After powering on a power supply, wait at least 60
seconds before turning it off.
If the system is completely powered off when you power on the power
supply, the Routing Engine boots as the power supply completes its startup
sequence. If the Routing Engine finishes booting and you need to power
off the system again, first issue the CLI
After a power supply is powered on, it can take up to 60 seconds for status
indicators—such as the status LEDs on the power supply and the
show chassis
functioning normally. Ignore error indicators that appear during the first
60 seconds.
On the external management device connected to the Routing Engine, monitor the
8.
startup process to verify that the system has booted properly.
Connecting the MX240 Router to Management and Alarm Devices on page 211
Replacing an MX240 AC Power Supply Cord on page 337
Preventing Electrostatic Discharge Damage to an MX240 Router on page 444
CAUTION: Do not mix AC and DC power supplies within the same router.
Damage to the router might occur.
WARNING: Before performing DC power procedures, ensure that power is
removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off position, and tape the switch handle of the circuit breaker
in the off position.
You connect DC power to the router by attaching power cables from the external DC
power sources to the terminal studs on the power supply faceplates. You must provide
Chapter 17: Connecting the MX240 Router to Power
and
AC OK
command display—to indicate that the power supply is
LEDs light steadily, and the
DC OK
command.
request system halt
201