Rockwell-automation 1771-A1B_A2B_A3B_A3B1_A4B SERIES B Universal I/O C Manual de usuario descargar pdf (Pagina 11)

Universal I/O Chassis 11

Publication 1771ĆIN075A-EN-P - March 2002

   

equipment

grounding

conductors

ground

lug

bolt

star

washer

Grounding electrode

conductor to grounding

electrode system

tapped hole

ground bus

mounting

13271

       

10020

       

Enclosure

Wall

Equipment-Grounding

Conductor

Scrape

Paint

Star

Washer

Nut

Ground

Lug

Scrape paint on enclosure wall

and use a star washer.

Bolt

Functional Ground

• use 2.54cm (1in.) copper braid or 10.0mm

(8 AWG) copper wire to connect

each chassis, the enclosure and a central ground bus mounted on the

backĆpanel

• 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)

Protective Earth Ground

• use a 2.5mm

(14 AWG) copper wire for the equipment grounding conductors

• install a bonding wire [2.5mm

(14AWG) minimum] for electrical contact

between the door and the enclosure; do not rely on the hinge

IMPORTANT

Do 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.

Connect an equipment grounding conductor directly from each

chassis to an individual bolt on the ground bus.

  

  

  

a ground stud the grounding stud

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Rockwell-automation 1771-A1B_A2B_A3B_A3B1_A4B SERIES B Universal I/O C Manual de usuario Pagina 11

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