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Replace Power Sys
tem Components
perform the following procedures. Also follow these procedures when replacing the power
cables, grounding cable, or both:
• Disconnect DC Power from the Router on page 109
• Connect DC Power to the Router on page 110
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 C LI
operational mode and issue the following command to shut down the router software
cleanly and preserve Routing Engine s tate information.
user@host> request system halt
Wait until a message appears on the console confirming that the operating system
has halted.
For more information about the command, see the JUNOS Internet Software Operational
Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
2. For each power supply, press the power switch on the power supply faceplate to
the OFF (O) position.
If you are power cycling the power supply rather than shutting it off
for a time, w
ait at least 60 seconds after turning it off before turning it
back on. If you need to power it off again, wait for at least 60 seconds
after power
ing it on.
3. Shut off the power flowing from both external power sources, so that the voltage across
the leads of the power cables is 0 V. Ensure that there is no chance that the cable leads
might become active during the procedure.
4. Using a 3-mm flat-blade screwdriver, turn the screw on each quick-connect terminal
counter-clockwise to loosen the terminal connector from around the cable.
5. Remove the cables from the terminal connectors an d from the hook located on the
faceplate to the right of the quick-connect terminals.
6. If you are decommissioning the router, loosen and remove the screw that secures the
groundingcabletothechassisandremovethegroundingcable.
7. Verify that the removed cables are not touching or blocking access to any router
components.
Replace Hardware Components
109