P.q'lin - Linearization Of The Process Characteristic - Burkert 8792 Operating Instructions Manual

Type 8792, 8793 Type 8792, 8793
Basic setting of the process controller
24.4 P.Q'LIN – Linearization of the process characteristic
This function automatically linearizes the process characteristic.
In doing so, the nodes for the correction characteristic are automatically determined. To do this, the program
moves through the valve stroke in 20 steps and measures the associated process variable.
The correction characteristic and the associated value pairs are saved in the menu option CHARACT → FREE.
This is where they can be viewed and freely programmed. For a description see Chapter "26.2.1".
If the CARACT menu option has still not been activated and incorporated into the main menu (MAIN), this will
happen automatically when P.Q'LIN is being run.
Run P.Q'LIN:
Key Action
/ Select P.Q'LIN
RUN
Hold down as long as
countdown (5 ...) is
running
The following displays are indi-
cated on the display:
Q'LIN #0
CMD=0%
Q.LIN #1
CMD=10%
... continuing to
Q.LIN #10
CMD=100%
Q.LIN
ready
EXIT Press
Table 47: P.Q'LIN; Automatic linearization of the process characteristic
Possible error messages when running P.Q'LIN:
Display
Q.LIN
err/break
P.Q'LIN
ERROR 1
P.Q'LIN
ERROR 2
Table 48: P.Q'LIN; possible error messages
Description
The function is in the main menu (MAIN) after activation of
P.CONTROL.
P.Q'LIN is started.
Display of the node which is currently running (progress is
indicated by a progress bar along the upper edge of the
display).
Automatic linearization was successfully completed.
Return to the main menu (MAIN).
Cause of fault
Manual termination of linearization by
pressing the key.
EXIT
No supply pressure connected.
No change to process variable.
Failure of the supply pressure while
P.Q'LIN running.
Automatic adjustment of the X.TUNE
positioner not run.
Remedial action
Connect supply pressure.
Check process and, if required, switch
on pump or open the shut-off valve.
Check process sensor.
Check supply pressure.
Run X.TUNE.
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