Juniper EX 3200 Manual page 2

2
Connecting DC Power to an EX 3200 or EX 4200 Switch
to connect to the earth ground. For instructions on connecting earth ground, see
Connecting Earth Ground to an EX-series Switch.
Install the power supply in the chassis. For instructions on installing a power
supply in an EX 3200 or EX 4200 switch, see Installing a Power Supply in an EX
3200 or EX 4200 Switch.
To connect DC power to an EX 3200 or EX 4200 switch:
Attach the electrostatic discharge (ESD) grounding strap to your bare wrist, and
1.
connect the strap to the ESD point on the chassis.
Ensure that the power supplies are fully inserted in the chassis and the screws
2.
on their faceplates are tightened.
Ensure that the input circuit breaker is open so that the voltage across the DC
3.
power 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 EX 3200 and EX 4200 switches has four terminals
labeled A+, A , B+, and B (see Figure 1 on page 1) for connecting DC power
source cables labeled positive (+) and negative ( ). The DC power supplies for EX
3200 and EX 4200 switches 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 DC Power Wiring Sequence Warning for EX 3200 and EX
4200 Switches and DC Power Electrical Safety Guidelines for EX 3200 and EX 4200
Switches.
Remove the screw securing the terminal block cover using the
4.
Phillips (+) screwdriver, number 2 and remove the terminal block cover (see
Figure 2 on page 3). Save the screw.