Process Controller - AUMA AC 01.2 Manual

Actuator controls
AC 01.2/ACExC 01.2 Profinet
8.5.

Process controller

Requirements
Characteristics
Application
This function requires one of the following equipments within the actuator:
Electronic control unit with MWG (non-intrusive version)
Potentiometer
Electronic position transmitter EWG/RWG
Further conditions for the process controller operation mode:
Process controller enabled and activated.
Operation mode Remote (Selector switch = position Remote control).
The following figure illustrates the function of the process controller:
The process controller [2] receives the process setpoint E7 and the actual process
value E4 (e.g. from a sensor). On the basis of both values, the process controller
calculates the position setpoint E1 for positioner [3]. In turn, the positioner [3]
compares this target setpoint with the actual position value E2 of the valve and issues
the operation commands (OPEN - CLOSE) for the actuator.
Figure 37: Process controller function
[1] Actuator controls
[2] Process controller
[3] Positioner
[4] Actuator
[5] Position transmitter e.g. EWG/RWG/MWG
[6] Sensor
[7] Valve
E1 Position setpoint (internal)
E2 Actual position value
E4 Actual process value
E7 Process setpoint
The process controller can be used to control pressure, flow or flow rates, flow levels
and temperature.
Application functions
57