Burkert Type 8750 - Manual (Page 27)

27
Start-up 24 V DC
Typ 8750
11.3. automatic adjustment (X.TUNE)
Warning!
danger of injury due to the valve position changing when the
X.TUNE function is run at operating pressure.
▶ Never run X.TUNE while the process is running.
▶ Secure system against unintentional activation.
note!
an incorrect control pressure or incorrectly connected oper-
ating pressure at the valve seat may cause the controller to
be wrongly adjusted.
•
X.TUNE must always be run at the control pressure available
during subsequent operation (= pneumatic auxiliary energy).
• Run the X.TUNE function preferably without operating medium
pressure to exclude interference caused by flow forces.
The following functions are actuated automatically:
• Adjustment of the sensor signal to the (physical) stroke of the
actuating element used.
• Determination of parameters of the PWM signals to control the
control valves integrated in Type 8693.
• Setting the controller parameters of the process controller. Opti-
mization occurs according to the criteria of the shortest possible
correction time with simultaneous freedom from overshoot.
To stop X.TUNE, press the left or right selection key STOP
procedure:
Taste Action Description
MENU MENU Press for 3 s
(countdown in the
display)
Switching from
process level
setting level
/ Select X.TUNE Selection X.TUNE menu
MENU RUN Press for 5 s
(countdown in the
display)
Start of the automatic adjustment
X.TUNE
Messages on the progress of the
X.TUNE on the display:
„TUNE #1....“-„X.TUNE READY“
11)
MENU EXIT Press any key Exit X.TUNE menu
MENU EXIT Press
Switching from
setting level
process level
Tab. 18: Setting the input signal
You must exit the main menu by pressing the left selection
key
MENU EXIT before the modified data is saved to the
memory (EEPROM). During the save process, the save symbol
is indicated on the display.
11)
„TUNE err/break“ if a fault occurs.
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