Download Operating Instructions Type 8792, 8793 Positioner

Type 8792, 8793
Start-up, operation
position controller Type 8792
21.3.10.X.CONTROL Parameterization of the position controller
Use this function to set the parameters for the position controller (dead band and amplification factors).
ENTER
X.CONTROL
INPUT
DBND
1%
OK
+
*
DBND
1%
KXopn
0001
KXcls
0001
INPUT
KXopn
1
OK
+
*
-
INPUT
KXcls
1
OK
EXIT
+
*
* If the sub-menu is left by pressing the selection key on the left (ESC), the value remains unchanged.
Fig. 55:
Operating structure X.CONTROL
DBND Insensitivity range (dead band) of the position controller
Input the dead band as %, relating to the scaled stroke range;
i.e. X.LIMIT Max - X.LIMIT Min
(see Auxiliary function 21.3.8.X.LIMIT Limits the
mechanical stroke range).
This function causes the controller to respond only from a specific control difference; as a result the solenoid
valves in the positioner and the pneumatic actuator are protected.
If the auxiliary function X.CONTROL is in the main menu while X.TUNE (Autotune of the position controller) is running, the dead band DBND is determined automatically depending on the friction behaviour
of the actuator drive. The guide value determined in this way can be re-adjusted manually.
Xd1‘
Position setpoint value
Control
difference
Xd1
Position
actual value
Fig. 56:
to the
controller
Xd1
Xd1‘
Dead band
X.CONTROL graph
KX XXXParameter of the position controller
KXopn Amplification factor of the position controller (for closing the valve)
KXcls Amplification factor of the position controller (for opening the valve)
106
english