Function of the position control – Burkert Type 8791 User Manual
Page 17
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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 valve
Control 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
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