Burkert Type 8635 - Manual (Page 101)

8635 - 99
O
PERATING THE
P
ROCESS
C
ONTROLLER
(S/HART)
P.Q’LIN
Starting the routine for linearization of the process characteristic
This function makes sense only when flow control is to be carried out.
➔ ➔ ➔ ➔ ➔ You start the routine for linearization of the process characteristic by calling up the menu item P.Q’LIN
in the main menu and pressing the MANUAL/AUTOMATIC key for 5 seconds.
With the activation of the function P.CONTRL, the function P.Q’LIN, which is required for process control,
is copied into the main menu.
Via this function, the program is started for autonomous determination of the fixed points for a correction
characteristic.
The program increases in 20 steps the valve stroke from 0 to 100 % and measures the associated
process variable. The pairs of values of the correction characteristic are stored as a freely
programmable characteristic under the menu item
CHARACT/CHAFREE and may be viewed under this
menu item.
If the menu item CHARACT was not transfered under the menu item ADDFUNC to the main menu, this
is done automatically on execution of the function P.Q’LIN. At the same time, the menu item CHARACT/
CHAFREE is activated.
Display Description
P.Q’LIN 5 Countdown from 5 to 0 for starting
P.Q’LIN 4 the routine
:
P.Q’LIN 0
¦ P.Q’LIN 0 Display of the fixed point that is being approached at the moment
¦ P.Q’LIN 1 (progress is indicated by rotating bars to the left of the display)
¦ P.Q’LIN 2
¦ P.Q’LIN 3
:
P.Q’LIN.END (flashing) End of routine
Q.ERR X.X Message on occurrence of an error
(to right of display: error number - see section
Maintenance of the
process controller)
Displays during calling up and execution of the routine