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4. .Connect each power supply to the power source by inserng the DC connector of the provided

power cable into the power supply. See Figure 54 on page 121.

Figure 54: Connecng DC Power Cable to QFX5200-48Y

5. Connect each power cable to the power sources. Secure power source cables to the power supplies

by screwing the ring lugs aached to the cables to the appropriate terminals

• Connect the ring lug of the green-yellow cable to earth ground.

• Connect the ring lug of the black cable to the negave (–) DC power source.

• Connect the ring lug of the red cable to the posive (+) DC power source.

The QFX5200-48Y is designed to operate with a DC power supply that has a single, non-redundant,

feed input. For source redundancy, two DC power supplies must be installed in QFX5200-48Y;

connect source (A) to one power supply and connect source (B) to the second power supply. This

conguraon provides the commonly deployed A/B feed redundancy for the system.

CAUTION: The connecon between each power source and power supply must

include a circuit breaker.

Do not connect two sources to a single power supply because doing so can potenally

cause circulang current in feed wires whenever there is any dierence in the voltage

of the two sources.

6. Close the input circuit breaker.

NOTE: The switch powers on as soon as power is provided to the power supply. There is no

power switch on the device.

7. Verify that the LED on each power supply is lit green and on steadily.

121

Juniper QFX5200 User Manual

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