User Manual

Maintain and Replace the Power Supplies
Replace a DC Power Supply
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4. Press the power switch on the faceplate of one power supply to the ON ( | ) position. The
green OK LED on the power supply faceplate blinks rapidly for a short time, then lights
steadily.
5. Press the second power switch to the
ON ( | ) position and observe the LEDs on the
second power supply faceplate. They should light as described in Step 4.
If the LEDs are not lit in the appropriate pattern after 60 seconds, repeat the power
supply installation procedures described in “Install an AC Power Supply” on page 138,
and the previous steps in this procedure.
6. On the management device, monitor the startup process to verify that the system has
booted properly.
Replace a DC Power Supply
A DC-powered router has two load-sharing, redundant DC power supplies. Each power supply
is hot-removable and hot-insertable, as described in “Field-Replaceable Units (FRUs)” on
page 4. When one power supply fails or is powered down, the other power supply
automatically assumes the entire electrical load for the router.
To replace a DC power supply, perform the following procedures:
 Remove a DC Power Supply on page 142
 Install a DC Power Supply on page 144
After a power supply is turned on, it can take up to 60
seconds for status indicators—such as LEDs on the power
supply, show chassis commands, and messages on the
craft interface LCD—to indicate that the power supply is
functioning normally. Ignore error indicators that appear
during the first 60 seconds.
The Routing Engine boots as the power supply completes
its startup sequence. If the Routing Engine finishes booting
and you need to power down the router again, first issue
the CLI
request system halt command. For complete
instructions, see “Disconnect AC Power from the Router”
on page 140.
If after powering on the power supply you must power it
off, wait at least 60 seconds. After powering off a power
supply, wait 60 seconds before turning it back on.