Juniper Networks EX3200 Manual do Utilizador descarregar pdf (Página 175)

■ Phillips (+) screwdriver, number 2

Before you begin connecting DC power to an EX3200 or EX4200 switch:

■ Ensure that you have taken the necessary precautions to prevent ESD damage

(see “Prevention of Electrostatic Discharge Damage on EX Series Switches” on

page 236).

■ Ensure that you have connected the switch chassis to earth ground.

CAUTION: Before you connect power to the switch, a licensed electrician must attach

a cable lug to the grounding and power cables that you supply. A cable with an

incorrectly attached lug can damage the switch (for example, by causing a short

circuit).

To meet safety and electromagnetic interference (EMI) requirements and to ensure

proper operation, you must connect EX3200 and EX4200 switches to earth ground

before you connect them to power. For installations that require a separate grounding

conductor to the chassis, use the protective earthing terminal on the switch chassis

to connect to the earth ground. For instructions on connecting earth ground, see

“Connecting Earth Ground to an EX Series Switch” on page 141.

■ Install the power supply in the chassis. For instructions on installing a power

supply in an EX3200 or EX4200 switch, see “Installing a Power Supply in an

EX3200 or EX4200 Switch” on page 130.

To connect DC power to an EX3200 or EX4200 switch:

1. Ensure that the power supplies are fully inserted in the chassis and the screws

on their faceplates are tightened.

2. Ensure that the input circuit breaker is open so that the voltage across the DC

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 EX3200 and EX4200 switches has four terminals

labeled A+, B+, A–, and B– (see Figure 56 on page 148) for connecting DC power

source cables labeled positive (+) and negative (–). The DC power supplies for EX3200

and EX4200 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 Series

Switches” on page 245 and “DC Power Electrical Safety Guidelines for EX Series

Switches” on page 241.

Connecting DC Power to an EX3200 or EX4200 Switch ■ 149

Chapter 11: Connecting the Switch

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Juniper Networks EX3200 Manual do Utilizador Página 175