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Typ EP 501
Start-Up
23.4.
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 "24.2.1".
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 38:
P.Q'LIN; Automatic linearization of the process characteristic
Possible.error.messages.when.running P.Q'LIN:
Display
Cause of fault
Q.LIN
Manual termination of linearization by
err/break
pressing the
P.Q'LIN
No supply pressure connected.
ERROR 1
No change to process variable.
P.Q'LIN
Failure of the supply pressure while
ERROR 2
P.Q'LIN running.
Automatic adjustment of the X.TUNE
positioner not run.
Table 39:
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 indi-
cated by a progress bar along the upper edge of the display).
Automatic linearization was successfully completed.
Return to the main menu (MAIN).
EXIT
key.
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.
english
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