Burkert Type 8693 - Manual (Page 132)

132
Start-up and operation of the
position controller Type 8693
23.6.3. PARAMETER - parameter setting of the process controller
These positioner functions are used to specify the control parameters of the process controller.
The setting can be implemented automatically by means of the P.TUNE function (see chapter “23.6.6.
P.TUNE - Self-optimization of the process controller (process tune)“).
The basic principles of setting a controller can be found in the chapter entitled "57. Properties of PID
controllers".
DBND - Insensitivity area (dead band) of the process controller
This function causes the process controller to respond from a specific control difference only. This protects both
the solenoid valves in the positioner and the pneumatic actuator.
Factory setting: 1.0 % (with reference to the range of the process actual value scaled by PV SCALE - PVmin
and PVmax)
+
-
DBND 1.0%
DBND 1.0%
INPUT
OK
37)
Figure 77: Operating structure P.CONTROL - DBND
Insensitivity.area.for.process.control
Process set-point
value (SP) Control
difference
Xd2
Process
actual value
(PV)
Xd2
Xd2‘
Xd2‘
to the
controller
Dead band
Figure 78: Operating structure P.CONTROL - DBND
37)
If the sub-menu is left by pressing the selection key on the left (ESC), the value remains unchanged.
english
Type 8692, 8693