Burkert Type 8630 - Manual (Page 66)

64 - 8630
O
PERATION AND CONTROLLER FUNCTIONS
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 CHR 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 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.
Normalized valve stroke [%] (POS) For positioning applications of control systems, 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
TOP Control Continuous 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.