Disconnect DC Power from the Router
To disconnect DC power from the router, follow this procedure:
- 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.
- 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.
- Flip the power switch on both power supplies to the
OFF(O) position. See Figure 62.
- Using a Phillips screwdriver, loosen and remove the screws securing the protective shield over the terminal studs on one power supply. Remove the shield.
- Using a 7/16-in. nut driver or wrench, loosen the nuts securing the cable lugs to the terminal studs on the power supply, then remove the nut and washer from each terminal stud (see Figure 63).
Do not substitute a metric nut driver or wrench. A tool that does not fit the nuts exactly can damage them. If a 7/16-in. tool is not available, use pliers or an adjustable wrench. - Remove the cable lugs from the terminal studs.
- If you are decommissioning the router, loosen and remove the nuts and washers that secure the grounding lug to the power supply and remove the grounding lug.
- If not immediately attaching replacement cables, replace the protective shield over the terminal studs and tighten the screws that secure it to the box.
- Verify that the removed cables are not touching or blocking access to any router components.
- Repeats Steps 4 through 9 for the other power supply.
