Figure 44: Removing The Terminal Block Cover From A Dc Power Supply - Juniper EX4200 Hardware Manual

Copyright © 2015, Juniper Networks, Inc.
NOTE: The DC power supply in the switch has four terminals labeled A+,
B+, A–, and B– (see
cables labeled positive (+) and negative (–). The DC power supplies are
shipped with jumpers from A+ input to B+ input tied together and jumpers
from A– input to B– input tied together.
NOTE: The A+ and B+ terminals are referred to as +RTN and A– and B–
terminals are referred to as –48 V in
on page 310
Remove the screw securing the terminal block cover using the screwdriver and remove
3.
the terminal block cover (see

Figure 44: Removing the Terminal Block Cover from a DC Power Supply

Remove the screws on the terminals using the screwdriver. Save the screws.
4.
WARNING: Ensure that the power cables do not block access to switch
components or drape where people can trip on them.
Connect the power supplies to the power sources. Secure power source cables to the
5.
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:
Leave the jumpers on the power supply terminals in place.
a.
Secure the ring lug of the positive (+) DC power source cable to the A+ or B+
b.
terminal on the DC power supply.
Chapter 13: Connecting the Switch to Power
Figure 43 on page 179) for connecting DC power source
"DC Power Wiring Sequence Warning"
and "DC Power Electrical Safety Guidelines" on page
Figure 44 on page 181). Save the screw.
306.
Figure 45 on page 182).
181