113
Auxiliary functions
26.2.8. X.CONTROL – Parameterization of the positioner
This function can be used to re-adjust the parameters of the positioner.
The re-adjustment should only be made if it is required for the application.
The parameters for X.CONTROL are automatically set with the exception of DBND (dead band) when specifying
the basic settings by running X.TUNE.
If the setting for DBND (dead band depending on the friction behavior of the actuating drive) is also to be
automatically determined when X.TUNE is running, X.CONTROL must be activated by incorporating it into
the main menu (MAIN).
When X.TUNE is running, all previously re-adjusted values are overwritten (except the X.TUNE function
was manually parameterized).
DBND Insensitivity range (dead band)
KXopn Amplification factor of the proportional portion (for aerating the valve)
KXcls Amplification factor of the proportional portion (for bleeding the valve)
KDopn Amplification factor of the differential portion (for aerating the valve)
KDcls Amplification factor of the differential portion (for bleeding the valve)
YBfric Friction correction (for aerating the valve)
YEfric Friction correction (for bleeding the valve)
EXIT
Enter
value
ENTER INPUT
*
OK
X.CONTROL DBND 1 %
KXopn 1
KXcls 1
KDopn 0
KDcls 0
YBfric 0
YEfric 0
* If the submenu is left by pressing the
ESC
key, the value remains unchanged.
Figure 67: Operating structure X.CONTROL
DBND Insensitivity range (dead zone) of the positioner
Input the dead zone as %, relating to the scaled stroke range;
i.e. X.LIMIT Max - X.LIMIT Min (see Auxiliary function “26.2.6. 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 Type 8792/8793 and the pneumatic actuator are protected.
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