Function Of The Position Control - Burkert 8791 Manuel D'utilisation

Type 8791
Function
7.2. function of the position control
The position measuring system 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.
CMD
+
-
Position set-
point value
Position control circuit
Fig. 3: Signal flow plan of position controller
B1
Xd1
E1
Position
controller
POS
Z1
P
K
Control system Control valve
Solenoid valves
Position measuring
system
Valve opening
english
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