Burkert Type 8693 - Manual (Page 98)

98
Start-up and operation of the
position controller Type 8692
Position set-point value [%]
CMD
Standardised valve stroke [%] (POS) 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 character-
istic, 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
positioner features a transfer element which imple-
ments 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.
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 dif-
ference between the stroke values of two adjacent nodes must not be larger than 20 %.
FREE
y 0 ->: 0.0%
y 5 ->: 5.0%
y 100 ->: 100%
EXIT
SELEC
INPUT
+
-
y 0 ->: 0.0%
OK
INPUT
+
-
y 5 ->: 5.0%
OK
INPUT
+
-
y 100 ->: 100%
OK
23)
23)
23)
Figure 47: Fig. 12: Operating structure CHARACT FREE
23)
If the sub-menu is left by pressing the selection key on the left (ESC), the value remains unchanged.
english
Type 8692, 8693