Figure 44: Removing The Terminal Block Cover From A Dc Power Supply - Juniper EX4200-24T Hardware Manual

Copyright © 2017, Juniper Networks, Inc.
Ensure that you have the following parts and tools available:
DC power source cables (12–14 AWG) with ring lug (Molex 190700067 or equivalent)
(not provided)
Phillips (+) screwdriver, number 2
To connect DC power to the switch:
Ensure that the power supplies are fully inserted in the chassis and the screws on their
1.
faceplates are tightened.
Ensure that the input circuit breaker is open so that the voltage across the DC power
2.
source cable leads is 0 V and that the cable leads will not become active while you
are connecting DC power.
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 281
page 276.
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.
Chapter 13: Connecting the Switch to Power
Figure 43 on page 152) for connecting DC power source
"DC Power Wiring Sequence Warning"
and "DC Power Electrical Safety Guidelines for Switches" on
Figure 44 on page 153). Save the screw.
153