Burkert Type 8625 Manual de usuario descargar pdf (Pagina 30)

28 - 8625-2 Standard

english

characteristic and step response of the P fraction of a PI controller

Characteristic

Step response

Control range ∆x

Correcting range ∆y

Floating time T

I fraction:

Function:

y =

∫ ∫

∫ x

is the integration or floating time. It is the time that expires until the controller

output has run through the entire correcting range.

Characteristic:

A purely I controller completely eliminates the effects of disturbances. It thus has a

favourable static behaviour. Because of its finite correcting speed, it works more

slowly than a P controller and tends to oscillation. It is hence dynamically relatively

unfavourable.

Superimposing:

With a digital controller with sampling time T

and noting that T

= K

one can

write:

y = K

+ T

∑∑

∑ x

)

y : controller output

: amplification factor

: deviation (x

= w - x)

: sampling time

: reset time

max

min

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 117 118

Sin comentarios

Burkert Type 8625 Manual de usuario Pagina 30