Replacing A Dc Power Supply - Juniper M7I Hardware Manual

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Replacing a DC Power Supply

Copyright © 2010, Juniper Networks, Inc.
NOTE: After powering on a power supply, wait at least 60 seconds before
turning it off.
If you have only one power supply or the router is completely powered off when you
6.
power on the power supply, the Routing Engine boots as the power supply completes
its startup sequence.
On the external management device connected to the Routing Engine, monitor the
startup process to verify that the system has booted properly.
NOTE: If the Routing Engine finishes booting and you need to power off
the router again, see "Powering Off the M7i Router" on page 60. After
powering off a power supply, wait at least 60 seconds before turning it
back on.
Check the LEDs on the power supply faceplate. When the power supply has powered
7.
on successfully, the green
After a power supply is powered on, it can take up to 60 seconds for status
indicators—such as the output status LED on the power supply, the command display
output, and messages on the LED display on the craft interface—to indicate that the
power supply is functioning normally. Ignore error indicators that appear during the
first 60 seconds.
If the LEDs are not lit in the appropriate pattern after 60 seconds, repeat the procedures
to replace the AC power cord.
M7i AC Power Electrical Safety Guidelines and Warnings on page 149
M7i Router AC Power Supply Specifications on page 166
Replacing an M7i AC Power Supply on page 106
A DC-powered router has one or two load-sharing, redundant DC power supplies that
install into the rear of the router as shown in Figure 2 on page 6. Each power supply is
hot-removable and hot-insertable, as described in "M7I Field-Replaceable Units (FRUs)"
on page 85. When one power supply fails or is powered down, the remaining power
supplies automatically assume the entire electrical load for the router. For more
information about DC power supplies, see "M7i DC Power Supply" on page 23.
To replace a DC power supply, perform the following procedures:
Removing a DC Power Supply on page 112
Installing a DC Power Supply on page 113
Chapter 15: Replacing M7i Hardware Components
LED lights steadily.
OUTPUT OK
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