Response Electronics CL6011B Specifikace stáhnout pdf (Strana 150)

100

101

4Ć68 FST Configuration

Original Ć June 1990CE4.2:CL6211

DTC DTC

INSTRUCTION NAME: DTC (dead time compensation)

DESCRIPTION:

This instruction provides feedback control for a loop with significant transport

delay, based on actual process dead time, gain, and lag time. DTC provides a process model that

simulates the expected response of the process. By predicting the process response, the loop can

be tuned as though the process has no significant transport delay. The dead time compensation is

based on a linear process variation to a change in valve output. The SVA and SVD inputs remain

unchanged. DTC can be used in conjunction with GCI and CASC.

The DTC function can be used in the same FST loop with the following PCA types only:

H PI/PID/I

H Error-squared PI/PID

H Notch Gain PI/PID

H Adaptive Gain PI/PID

GRAPHIC REPRESENTATION: SYMBOLIC REPRESENTATION:

100%

INPUT

OUTPUT

SET POINT

PROCESS

VARIABLE

ttt

50%

100%

50%

tt t

63%

f(t)

= LAG

= DEADTIME

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