Burkert 8630 Instructions De Service page 96

3.2.2 Using the Top Control Continuous as a process controller (Fig. 3.7)
By using the Top Control Continuous as a process controller, the previous position control function is a component of the main
control loop.
The process controller within the main control loop posseses a PID function. The process setpoint (SP) is used and compared to
the controlled process value (PV). A sensor delivers the actual value. The manipulated variable correction functions as described
in chapter 3.2.1 represents a disturbance variable.
Position control
SP
Process setpoint
Fig 3.7: Process control diagram
Top Control Continuous
B1
Xd1
E1
Position controller Position
control soleno-
id valve
XPOS
Path measuring system
CMD
Xd2
Process controller soleno-
id valve
Z1
P
K
Valve actuator
Z2
Valve
Position
opening
control
loop
Process
PV
Transmitter
Valve opening
Process value
95