Rockwell-automation 1771-QB Linear Pos. Manual de usuario descargar pdf (Pagina 33)

Hardware Description

Chapter 4

44

Use these equations to determine the maximum length and positioning

resolution for the transducer:

maximum length = 1680/(T x N)

resolution = 1/(58.5 x T x N)

where:

T = transducer constant stamped on transducer head (typically

9.0500 microseconds per inch)

N = number of circulations

The following table gives several maximum transducer lengths assuming a

transducer constant of 9.0500 microseconds per inch. Resolutions may be

limited by the physical capabilities of the transducer. See Chapter 8 for a

description of a procedure for verifying the transducer constant.

Number of

Circulations

Resolution

(Inches)

Maximum Transducer Length

(Inches)

0.002

185.6

0.001

92.8

0.0006

61.9

0.0005

46.4

0.0004

37.1

6 0.0003 30.9

7 0.0003 26.5

8 0.0002 23.2

9 0.0002 20.6

10 0.0002 18.6

Important: Apply a 10% to 20% margin when determining the maximum

transducer length. The available stroke length will be less than indicated above

due to the null space (typically 2 inches) near the transducer head.

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Rockwell-automation 1771-QB Linear Pos. Manual de usuario Pagina 33