Charact; Characteristic Correction Between The Input Signal (Position Set-Point Value) And Stroke - Burkert 8791 REV.2 Operating Instructions Manual

10.1.3

CHARACT -

Characteristic correction between the input signal (position
set-point value) and stroke
Characteristic (client-specific characteristic)
This function enables a transfer characteristic with regard to the set-point value (position set-point value)
and valve stroke for correcting the flow or operating characteristic.
The transfer characteristic can only be changed with communication software.
Factory setting: DIP switch 3 OFF (linear)
DIP switch Position
3 ON
OFF
Table 22: DIP switch 3
The switch position of the DIP switch in the positioner takes precedence over the communication
software, i.e. settings of the correction characteristic (CHARACT) which are changed with the
communication software are only active if DIP switch 3 is set to ON in the positioner.
Characteristics that can be selected with the communication software:
Characteristic curve
Linear
1:25
1:33
1:50
25:1
33:1
55:1
FREE
Table 23: Characteristic selection
20) The characteristic type can only be changed with communication software
40
Function
Correction characteristic for adjusting the operating characte-
ristic (linearization of the operating characteristic, CHARACT)
Linear characteristic
Description
Linear characteristic
Equal percentage characteristic 1:25
Equal percentage characteristic 1:33
Equal percentage characteristic 1:50
Inverse equal percentage characteristic 25:1
Inverse equal percentage characteristic 33:1
Inverse equal percentage characteristic 55:1
User-defined, freely programmable characteristic via supporting points
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Type 8791, REV.2
Functions
20)