Bronkhorst Multibus Bedienungsanleitung PDF herunterladen (Seite 23)

BRONKHORST®

Page 23 Operational instructions for digital multibus instruments 9.17.023

5 CONTROL PARAMETERS

The controlling algorithm for the valve handled by the micro-controller consists of several parameters which can be

set via the BUS/RS232. Although many parameters could be accessed via BUS/RS232, Bronkhorst advises not to

change these parameters because during manufacturing they have got optimal values for their purposes. Changing of

controller settings should be performed by or under supervision from trained service personnel only.

The picture below shows the basic controller diagram of the digital instrument. It consists of a standard PID controller

with a number of add-ons.

Basically, when a faster or slower controller response is needed, only the controller speed (Kspeed) or PID-Kp has to

be changed.

Data Type

Range

read/write

Secured

DDE

Proc/par

5.1 PID-KP

float

0…1E+10



167

114/21

PID controller response, proportional action, multiplication factor.

5.2 PID-TI

float

0…1E+10



168

114/22

PID controller response, integration action in seconds.

5.3 PID-TD

float

0…1E+10



169

114/23

PID controller response, differentiation action in seconds.

5.4 C

ONTROLLER SPEED

(Kspeed)

float

0…3.40282E+38



254

114/30

This parameter is the controller speed factor. PID-Kp is multiplied by this factor.

5.5 OPEN FROM ZERO RESPONSE

unsigned char

0…255



165

114/18

Controller response when starting-up from 0% (K

open

Kp multiplication factor when valve opens).

Value 128 is default and means: no correction.

Otherwise controller speed will be adjusted as follows:

Zero) from Open(128

1.05*response oldresponse New

−

open

normal

stable

Sensor

Control Valve

Flow

Setpoint

speed

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 49 50

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