Juniper EX4300 Hardware Manual page 200

EX4300 Switch Hardware Guide
178
NOTE: The V+ terminals are referred to as +RTN and V– terminals are
referred to as –48 V in
and "DC Power Electrical Safety Guidelines" on page
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.
Remove the screws on the terminals by using the screwdriver. Save the screws.
6.
WARNING: Ensure that the power cables do not block access to switch
components or drape where people can trip on them.
NOTE: The DC power supply has five terminals, two positive terminals
labeled V+ and two negative terminals labeled V–, for connecting the
power supply to a dedicated DC power source by using the DC power
source cables labeled positive (+) and negative (–), and one terminal for
connecting the power supply to earth ground (see
The V+ terminals are shunted internally together, as are the V– terminals
to provide parallel current path.
Connect one end of the grounding cable to a proper earth ground, such as the rack in
7.
which the switch is mounted.
Place the grounding lug attached to the grounding cable over the earthing terminal
8.
on the DC power supply.
Secure the grounding lug to the protective earthing terminal with the washers and
9.
screws.
Dress the grounding cable and ensure that it does not touch or block access to other
10.
switch components.
WARNING: Ensure that the cable does not drape where people could trip
over it.
Connect each power supply to the power source. Secure power source cables to the
11.
power supplies by screwing the ring lugs attached to the cables to the appropriate
terminals by using the screw from the terminals (see
To connect a power supply to a power source:
"DC Power Wiring Sequence Warning" on page 308
Figure 52 on page
Copyright © 2015, Juniper Networks, Inc.
304.
Figure 52 on page 179).
179).