Juniper QFabric QFX3000-G Hardware Documentation page 518

QFX3000-G QFabric System Hardware Documentation
468
WARNING: Ensure that the power cables do not block access to device
components or drape where people can trip on them.
Connect each power supply to the power sources. Secure power source cables to the
7.
power supplies by screwing the ring lugs attached to the cables to the appropriate
terminals by using the screw from the terminals (see
Figure 193 on page 469).
CAUTION: The DC power supply has four terminals labeled V+, V+, V–,
and V– for connecting DC power source cables labeled positive (+) and
negative (–). The V+ terminals are shunted internally together, as are the
V- terminals. The same polarity terminal can be wired together from the
same source to provide an additional current path in a higher power
chassis. Do not connect the terminals to different sources. For example,
connect –48 V from DC source feed A to the input terminals of one power
supply and connect –48 V from feed B to the input terminals of the second
power supply on the other side of the chassis. This configuration provides
the commonly deployed A/B feed redundancy for the system.
Secure the ring lug of the positive (+) DC power source cable to the V+ terminal
a.
on the DC power supply.
Secure the ring lug of the negative (–) DC power source cable to the V– terminal
b.
on the DC power supply.
Tighten the screws on the power supply terminals until snug using the screwdriver.
c.
Do not overtighten—apply between 5 in-lb (0.56 Nm) and 6 in-lb (0.68 Nm) of
torque to the screws.
Figure 194 on page 469 and
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