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17 System mode ADVANCED
NOTICE
Min/Max Position
▶ The mechanical regulating distance (from limit stop to limit stop) is limited to the set values with the parameters Min Posi-
tion and Max Position. This way, the actuator's mechanical positioning range can be limited.
Closetight:
If parameter 23: Closetight is activated, the actuator is vented at a set value of < 0.5%, even if there is a set Min Position of, for
example, 10%. With a set value of > 1.5% the actuator is moved back to 10%.
With a set value of > 99.5%, the actuator is opened completely, even if the Max Position is set, for example, to 90%. With a set
value of < 98.5%, the actuator is moved back to 90%.
Set value w
[%]
Stroke x
[%]
17.2.5.2.2 Setting the dead zone
DeadBand
Positioner's dead band
The dead band shows the maximum permissible system deviation between actual value and set value.
With DeadBand = AUTO, the dead band is matched to the requirements of the control circuit during initialization. In the other
discrete settings, the fixed value for the dead band is used.
NOTICE
Increased wear due to low value
▶ The level of the system deviation should always correspond to the requirements of the valve and the control circuit. A value
of < 1.0% is not recommended, since this could cause oscillating control characteristics (e.g. for actuators with discontinu-
ous movement profiles). This could put a great deal of stress on the internal pilot valves.
▶ The following principle applies: The smaller the set value, the greater the wear and the shorter the service life. Therefore,
the value should only be set to the exact value required.
17.2.5.2.3 Setting alarm output functions and switch points
Alarm Output:
Submenu for setting the alarm outputs.
Activates or deactivates the alarm function
The reaction of the alarms (limiting contacts) relates to the position measurement (mechanical distance).
x = current actual value
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