7. Connect each power supply to the power sources. Secure power source cables to the power
supplies by screwing the ring lugs aached to the cables to the appropriate terminals by using the
screw from the terminals (see Figure 52 on page 119and Figure 53 on page 120 ).
The QFX5200-32C 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
QFX5200-32C; connect source (A) to one power supply and connect source (B) to the second
power supply. This conguraon provides the commonly deployed A/B feed redundancy for the
system.
The terminal block of the power supply has four terminals labeled V+, V+, V–, and V– for
connecng DC power source cables labeled posive (+) and negave (–). The V+ terminals are
shunted internally together, as are the V- terminals.
CAUTION: The connecon 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
potenally cause circulang current in feed wires whenever there is any dierence
in the voltage of the two sources.
a. Secure the ring lug of the posive (+) DC power source cable to the V+ terminal on the DC
power supply.
b. Secure the ring lug of the negave (–) DC power source cable to the V– terminal on the DC
power supply.
118
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