Value Description
Upper value active Tight sealing for lower value of the tight closed limit active.
Both values active Tight sealing active for lower and upper value of the tight closing limit.
Tab. 21: Tight close mode
Tight close lower value
The ‘Tight close lower value’ parameter defines the lower value of the tight closing. If the setpoint
position falls below this value, the valve is moved to the lower end position with maximum drive force.
Value range Description
0.0 … 45.0% Permissible setting range, factory setting 2.0%
Tab. 22: Tight close lower value
Tight close upper value
The ‘Tight close upper value’ parameter defines the upper value of the tight closing. If the setpoint
position exceeds this value, the valve is moved to the upper end position with maximum drive force.
Value range Description
55.0 … 100.0% Permissible setting range, factory setting 98.0%
Tab. 23: Tight close upper value
Control mode
The ‘Control mode’ parameter defines the currently effective control mode.
Value Description
robust Factory setting: the positioner approaches the setpoint position slowly
and accurately.
fast The positioner approaches the setpoint position quickly. It may over-
shoot.
user defined The positioner regulates according to parameters specified by the user.
User-defined controller parameters: direction-dependent P, I and D
components.
Tab. 24: Control mode
Initialization
The positioner is not initialised in delivery status.
It must be initialised in the following cases:
– During commissioning
– After changes in the system structure
–
After reset to factory settings
The permissible stroke range and the controller parameters are determined during initialisation. This
involves both end positions being approached in succession independently of the pending setpoint
value.
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