CAUTION: The connection 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 potentially
cause circulating current in feed wires whenever there is any difference 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.
To connect power to a DC-powered QFX5120-48Y switch:
The DC power supply has four terminals labeled V-, V-, V+, and V+ for connecting DC power source cables labeled
positive (+) and negative (–).
WARNING: Ensure that the input circuit breaker is open so that the cable leads do not become active
while you are connecting DC power.
CAUTION: Before you close the input breaker, install the power supply, and then connect the DC
power source cables.
1. Remove the terminal block cover. The terminal block cover is a piece of clear plastic that snaps into place over the
terminal block.
2. Remove the screws on the terminals by using the screwdriver. Save the screws.
3. Connect each power supply to a power source. Secure the power source cables to the power supplies by screwing the
ring lugs that are attached to the cables to the appropriate terminals by using the screws from the terminals.
a. Secure the ring lug of the positive (+) DC power source cable to the V+ terminal on the DC power supply.
b. Secure the ring lug of the negative (–) DC power source cable to the V– terminal on the DC power supply.
c. Tighten the screws on the power supply terminals by using an appropriate screwdriver. Do not overtighten—apply
between 5 lb-in. (0.56 Nm) and 6 lb-in. (0.68 Nm) of torque to the screws.
4. Replace the terminal block cover.
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