Positioner.type.ep.501; Positioner.type.ep.501 - EBRO ARMATUREN EP 501 C Operating Instructions Manual

Typ EP 501
Description of System
8. POSITIONER TYPE EP 501
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.
CMD
+
Position set-
point value
Figure 3: Position control circuit in Type EP 501
B1
Xd1
E1
-
Positioner
POS
Position control circuit
Z1
P
K
Control system Continuous
Solenoid valves valve
Position sensor
english
Valve opening
17