ECKELMANN VS 300 - Determining the Setpoint with Speed Controller

Function of VS 300
27
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
4.3.6 Determining the setpoint with speed controller
Low-pressure detected by an A/D converter is compared with the setpoint. The following relationship applies:
Controlerror 
Additionally a speed setpoint is determined. The following relationship applies for calculation:
U
setp
 P
Action

U
Setp
= Frequency changer setpoint (0-10 V)
P
Action
= Proportional action of controller
I
Action
= Integral action of controller
Control error:
P
Action


t
0_Act

2
t
0_Act
= Current value of t
0
t
0_Setp
= Setpoint for t
0
The P action of the controller responds directly to control errors. The I action avoids sustained control errors.
I
Action
 I
Actionl


t
0_Act
 t
0_Setpl

8

adjusting diff.
20
Adjusting differential = Definable controller speed