Juniper ACX5048 Manual page 138

ACX5048 and ACX5096 Universal Access Router
118
NOTE: The V+ terminals are referred to as +RTN, and V– terminals are
referred to as –48 V in DC Power Wiring Sequence Warning and DC Power
Electrical Safety Guidelines.
Ensure that the power supplies are fully inserted in the chassis.
4.
Remove the terminal block cover. The terminal block cover is a piece of clear plastic
5.
that snaps into place over the terminal block (see
Remove the screws on the terminals using the screwdriver. Save the screws.
6.
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 40 on page 119 ).
The ACX5000 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 ACX5000; connect source (A) to one power supply and connect source
(B) to the second power supply. This configuration 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 connecting DC power source cables labeled positive (+) and negative (–). The V+
terminals are shunted internally together, as are the V- terminals.
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.
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 39 on page 119).
Figure 39 on page 119 and
Copyright © 2015, Juniper Networks, Inc.