Owner manual

17
Function
7.2. Function of the position control
The position sensor records the current position (POS) of the pneumatic actuator. The position controller compares
this actual position value with the set-point value (CMD) which is a standard signal. If there is a control difference
(Xd1), the actuator is aerated and deaerated via the control system. In this way the position of the actuator is changed
until control difference is 0. Z1 represents a disturbance variable.
Valve opening
Control valveControl system
Solenoid valves
Position sensor
Position
controller
Position set-
point value
CMD
Xd1
B1
E1
P
K
Z1
POS
Position control circuit
+
-
Figure 3: Signal flow plan of position controller
english
Type 8791