Burkert Type 8793 - Manual (Page 109)

109
Auxiliary functions
Position set-point value [%]
CMD
Standardised valve stroke [%] (POS)
Figure 53: Characteristics
In the case of control tasks for closed-loop control systems it is usually particular demands which are placed on the
course of the operating characteristic, e.g. linearity. For this reason it is occasionally necessary to correct the course
of the operating characteristic in a suitable way. For this purpose the Type 8792/8793 features a transfer element
which implements different characteristics. These are used to correct the operating characteristic.
Equal percentage characteristics 1:25, 1:33, 1:50, 25:1, 33:1 and 50:1 and a linear characteristic can be set.
Furthermore, a characteristic can be freely programmed via nodes or automatically calibrated.
26.2.1.1. Inputting the freely programmable characteristic
The characteristic is defined via 21 nodes which are distributed uniformly via the position set-point values ranging
from 0 – 100 %. Their distance is 5 %. A freely selectable stroke (adjustment range 0 – 100 %) is assigned to each
node. The difference between the stroke values of two adjacent nodes must not be larger than 20 %.
*
GRAPH GRAPH
y 0 ->: 0,0%
y 5 ->: 5,0%
y 100 ->: 100%
FREE SELEC INPUT
INPUT
OK
Enter
value
EXIT
* If the submenu is left by pressing the ESC key, the value remains unchanged.
Figure 54: Operating structure CHARACT FREE
english
Type 8792, 8793