Rockwell-automation System Design for the Control of Electrical Noise Manual do Utilizador descarregar pdf (Página 77)

Publication GMC-RM001A-EN-P — July 2001

Chapter

High Speed Registration Inputs

Chapter Objectives

This chapter describes how wiring, sensitive to electrical noise,

benefits from proper noise reduction strategies. This chapter covers

the following topics:

• Understanding registration inputs

• Noise reduction methods

• Power supply wiring options

• Signal noise filter options

• Registration error

Understanding Registration

Inputs

High speed registration inputs are potentially sensitive to noise by

design. Typically, the specification states that the input responds

within 1 microsecond of the signal going high, while in practice, the

response is often even faster. Noise pulses of this duration are

common in a typical drive system.

IMPORTANT

Coupling is usually capacitive if unshielded cable is

run near noisy cables or if voltage differentials exist

between the detector mounting and the equipment

carrying the registration input. For these reasons,

treat high speed registration input circuits with

special care.

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Rockwell-automation System Design for the Control of Electrical Noise Manual do Utilizador Página 77