Charact; Transfer Characteristic Between Input Signal (Position Set-Point Value) And Stroke - Burkert 8791 Manuel D'utilisation

Type 8791
Functions

10.1.3 CHARACT -

Transfer characteristic between input signal
(position set-point value) and stroke
Characteristic (customer-specific characteristic)
This function can be used to activate a transfer characteristic with respect to set-point value (set-point position)
and valve stroke for correction of the flow or operating characteristic.
The transfer characteristic can be changed via the communications software only.
Factory settings: DIP switch 3 set to OFF (linear)
DiP switches Position
3 ON
OFF
Table 18: DIP switch 3
The switching position of the DIP switches in the positioner has priority over the communications
software, i.e. settings of the correction characteristic (CHARACT) which are changed via the communica-
tions software are not active unless DIP switch 3 in the positioner is set to ON.
Characteristics which can be selected via the communications software:
Characteristic
Linear
1 : 25
1 : 33
1 : 50
25 : 1
33 : 1
55 : 1
FREE
Table 19: Selection of characteristics
The characteristic type can be changed via the communications software only.
9)
Function
Correction characteristic for adjustment of the operating character-
istic (linearization of the process characteristic CHARACT)
Linear characteristic
Description
Linear characteristic
Equal percentage characteristic 1 : 25
Equal percentage characteristic 1 : 33
Equal percentage characteristic 1 : 50
Inversely equal percentage characteristic 25 : 1
Inversely equal percentage characteristic 33 : 1
Inversely equal percentage characteristic 55 : 1
User-defined characteristic, freely programmable via nodes
9)
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