Rockwell-automation 1771-A2BSS_A3B1SS Install Instruc Universal I/O Ch Manual de usuario descargar pdf (Pagina 7)

Universal I/O Chassis 7

Publication

1771–5.60 – May 1999

Connect Equipment Grounding Conductor

■

use

2.54cm (1in.) copper braid or 8 AWG copper wire to connect

each chassis, the enclosure and a central ground bus mounted

on the back-panel

■

use a steel enclosure to guard against electromagnetic

interference (EMI)

■

make sure the enclosure door viewing window is a laminated

screen or a conductive optical substrate (to block EMI)

■

install a bonding wire for electrical contact between the door and

the enclosure; do not rely on the hinge

equipment

grounding

conductors

ground

lug

bolt

star washer

Grounding electrode conductor

to grounding electrode system

tapped hole

ground bus

mounting

13271

Connecting Equipment Ground Conductor to a Ground Bus

10020

enclosure wall

bolt

ground lug

nut

star washer

equipment

grounding

conductor

star washer

Connecting Equipment Ground Connector to an Enclosure

scrape

paint from

panel

not lay one ground lug directly on top of the other; this

type of connection can become loose due to compression

of the metal lugs.

Place the first lug between a star washer and a nut with a

captive star washer

After tightening the nut, place the second lug between the

first nut and a second nut with a captive star washer

Important:

Connect an equipment grounding conductor directly from each

chassis to an individual bolt on the ground bus.

For chassis with Connect the equipment grounding conductor using

a ground stud the grounding stud

no ground stud a mounting bolt

If the power supply has its own groundable chassis, do not connect

the GND terminal of the power supply. However, when you connect

power to a power supply without a groundable chassis (such as an ac

input power-supply module), you must also use 14 AWG copper

wire to connect its GND terminal to the ground stud or mounting

bolt connected to the ground bus.

Connect Ground Bus to Grounding-Electrode System

The grounding-electrode system is at earth-ground potential and is

the central ground for all electrical equipment and ac power within

any facility. Use a grounding-electrode conductor to connect the

ground bus to the grounding-electrode system. Use at minimum 8

AWG copper wire for the grounding-electrode conductor to guard

against EMI. The National Electrical Code specifies safety

requirements for the grounding-electrode conductor.

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Rockwell-automation 1771-A2BSS_A3B1SS Install Instruc Universal I/O Ch Manual de usuario Pagina 7

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