Burkert Type 8635 User Manual

Page 66

64 - 8635

PERATING AND

ONTROLLER

UNCTIONS

For positioning applications of controllers,
special requirements are usually made on the
shape of the characteristic, e.g. linearity. For this
reason it is sometimes necessary to correct its
shape in a suitable manner. For this purpose, a
transfer member is provided in the SIDE Control
S/HART which realizes different characteristics.
These are used to correct the operation
characteristic.

The equipercentile characteristics 1:25, 1:33,
25:1, 33:1 and 50:1 and a linear characteristic
may be set. Furthermore, it is possible to freely
program a characteristic via fixed points or have
it calibrated automatically.

Normalized valve stroke [%] (POS)

Normalized position
setpoint [%]
(CMD)

Entering the freely programmable characteristic

The characteristic is defined via 21 fixed points distributed evenly over the 0...100 % range of the
position setpoint. They are separated by 5 %. Each fixed point may be allocated to a freely selectable
stroke (setting range 0...100 %). The difference between two adjacent values of stroke may not exceed
20 %.

To enter the point on the characteristic (values of the function), first select the menu item CHA FREE.

After pressing the MANUAL/AUTOMATIC key, the first fixed point is displayed (0 %). Next to it is the
value of the function (initially 0 %).

With the arrow keys, set a value of the function between 0 and 100 %. After confirmation by pressing
the MANUAL/AUTOMATIC key, the next fixed point is displayed, etc. Finally, press the MANUAL/
AUTOMATIC key to confirm the value of the function belonging to the last fixed point (100 %). The
display returns to the menu item CHARACT.