Rockwell-automation 1771-A1B_A2B_A3B_A3B1_A4B SERIES B Universal I/O C Manual de usuario descargar pdf (Pagina 12)

Universal I/O Chassis12

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

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

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.

  

Certain connections require shielded cables to help reduce the effects

of electrical noise coupling. Ground each shield at one end only. A

shield grounded at both ends forms a ground loop which could cause

faulty PLC-5 processor operation.

Ground each shield at the end specified in the appropriate

publication for the product.

Avoid breaking shields at junction boxes. Many types of connectors

for shielded conductors are available from various manufacturers. If

you do break a shield at a junction box:

• connect only category-2 conductors in the junction box

• do not strip the shield back any further than necessary to make a

connection

• connect the shields of the two cable segments to ensure continuity

along the entire length of the cable

For more information about grounding the chassis, see Industrial

Automation Wiring and Grounding Guidelines (publication

1770-4.1).

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Sin comentarios

Rockwell-automation 1771-A1B_A2B_A3B_A3B1_A4B SERIES B Universal I/O C Manual de usuario Pagina 12