Bürkert 8791, Operating Instructions Manual

Page: 35 / 186

35
Functions
CHARACT 10.1.3. -
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 Function
3 ON Correction characteristic for adjustment of the operating character-
istic (linearization of the process characteristic
CHARACT )
9)
OFF Linear characteristic
DIP switch 3 Table 16:
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 Description
Linear Linear characteristic
1 : 25 Equal percentage characteristic 1 : 25
1 : 33 Equal percentage characteristic 1 : 33
1 : 50 Equal percentage characteristic 1 : 50
25 : 1 Inversely equal percentage characteristic 25 : 1
33 : 1 Inversely equal percentage characteristic 33 : 1
55 : 1 Inversely equal percentage characteristic 55 : 1
FREE User-defined characteristic, freely programmable via nodes
Selection of characteristics Table 17:
A detailed description of the characteristics can be found in the operating manual for the communications
software for positioners.
9)
The characteristic type can be changed via the communications software only.
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Type 8791