5. Remove the terminal block cover. The terminal block cover is a piece of clear plastic
that snaps into place over the terminal block (see Figure 36 on page 91).
6. Remove the screws on the terminals using the screwdriver. Save the screws.
WARNING: Ensure that the power cables do not block access to device
components or drape where people can trip on them.
7. Connect each power supply to the power sources. Secure power source cables to the
power supplies by screwing the ring lugs attached to the cables to the appropriate
terminals by using the screw from the terminals (see Figure 37 on page 91 and
Figure 36 on page 91).
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 andconnect–48 V from feedB 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.
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 until snug using the screwdriver.
Do not overtighten—apply between 5 in-lb (0.56 Nm) and 6 in-lb (0.68 Nm) of
torque to the screws.
Copyright © 2017, Juniper Networks, Inc.90
QFX3500 Device Hardware Documentation
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