User Manual

Maintain and Replace the Power Supplies
Disconnect and Connect DC Power
147
15. Reinstall the protective shield covering the terminal studs.
16. Press the power switch on the power supply to the
ON ( | ) position. Verify that the green
LED labeled
OK on the power supply faceplate eventually lights steadily.
Disconnect and Connect DC Power
On a DC-powered router, the power cables from the external DC power sources connect to
terminal studs on each power supply. To disconnect or connect power to the router, perform
the following procedures:
 Disconnect DC Power from the Router on page 147
 Connect DC Power to the Router on page 149
Disconnect DC Power from the Router
To disconnect DC power from the router, follow this procedure:
1. On the console or other management device connected to the Routing Engine, enter CLI
operational mode and issue the following command to shut down the router software.
For more information, see the JUNOS Internet Software Operational Mode Command
Reference: Protocols, Class of Service, Chassis, and Management.
user@host> request system halt
Wait to continue until a message appears on the console confirming that the operating
system has halted.
2. Turn off the power flowing from each DC power source to a power supply. Ensure that
the voltage across the leads of the DC power cables is 0 V and that there is no chance
that they might become active during removal.
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.
If the router is completely powered down 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
down the router again, first issue the CLI
request system halt command. For complete instructions,
see “Disconnect DC Power from the Router” on page 147.
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.