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Description of System
7. POSITIONER TYPE 8792
The position sensor records the current position (POS) of the pneumatic actuator. The positioner compares this
actual position value with the set-point value (CMD) which is specified as a standard signal. If there is a control dif-
ference (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
Continuous
valve
Control system
Solenoid valves
Position sensor
PositionerPosition set-
point value
CMD Xd1
B1
E1
P
K
Z1
POS
Position control circuit
+
-
Figure 3: Position control circuit in Type 8792
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