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Installing the Circuit
To install the circuit breaker box, follow this procedure (see Figure 11):
Verify that there is no power flowing from either external power source,
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
For each power supply, verify that the power switch on the circuit breaker box is
in the OFF (O) position.
Attach an electrostatic discharge (ESD) grounding strap to your bare
wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see the hardware guide for your routing platform.
- Align the guide pin on the back of the circuit breaker
box with the opening in the chassis, then push the circuit breaker
box straight in.
- Tighten the thumbscrews at the top and bottom edge
of the circuit breaker box. Using a Phillips screwdriver, tighten
the screw at each corner of the box.
- Slide the power cable lugs for both power sources
onto the terminal studs on the circuit breaker box:
- Connect the positive (+) source cable lugs to the return
terminals on the circuit breaker box, which are labeled RTN(+).
- Connect the negative (–) source cable lugs to the
input terminals on the circuit breaker box, which are labeled –48V.
- Slide a washer and then screw a nut onto
each terminal stud (if the washers and nuts were not installed on
the studs, they should be in the accessory box). Using a 7/16-in.
nut driver or wrench, tighten the nuts.
Caution: 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.
- Replace the protective shield on the circuit breaker
box and tighten the screws that secure it to the box.
- Replace the rear lower impeller assembly by lining
up the rails with the guides inside the chassis, pushing the impeller
straight in, and tightening the thumbscrew at each corner of the impeller
cover. For complete instructions, see the hardware guide for your routing platform.
- Apply voltage from the DC power sources to the
power cables so the router receives power.
- Press the switches on the circuit breaker box to
the ON ( | ) position.
- Confirm that the LEDs on the power supply faceplates
indicate correct operation: the green CB ON LED lights
steadily, the blue OUTPUT OK LED blinks briefly, then
lights steadily, and the amber CB OFF LED does not light.
Note: After powering off a power supply, wait at least 60 seconds before turning
it back on. After powering on a power supply, wait at least 60 seconds before
turning it off.
Note: If the system is completely powered off 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 off
the system again, first issue the CLI request system halt command. For more information, see Disconnecting DC Power from
Note: After a power supply is powered 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.
Figure 11: Installing
the Circuit Breaker Box
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