2 DESCRIPTION
Fig. 5 Position control
Setposition
Fig. 6 Process control
Set
Process
position
controller
2.4 Safety position
In the event of power failure, the functioning of the actuator ensures that a pre-determined end
position is adopted (opened or closed by spring pressure).
PWM element
Position controller
Position controller PWM-element
Auxiliary control loop
Main control loop
E-7-
POSITIONER 1067
Valve actuator
Valve actuator
Process