Starting the function p.tune – Burkert Type 8793 User Manual
Page 100
100
Start-Up
To observe
PV, it is recommended to select via the arrow keys / the graphical display SP/PV(t).
To be able to select the display
SP/PV(t), it must be activated in the EXTRAS menu
(see Chapter "26.2.18. EXTRAS – Setting the display".
→
If
PV oscillates continuously, the preset amplification factor of the process controller KP in the
menu
P.CONTROL → PID.PARAMETER should be reduced.
→
As soon as the process actual value
PV is constant, the P.TUNE function can be started.
25.5.3. Starting the function
P.TUNE
WARNING!
Risk.of.injury.from.uncontrolled.process!
While the
P.TUNE function is running, the control valve automatically changes the current degree of opening
and intervenes in the running process.
• Using suitable measures, prevent the permitted process limits from being exceeded.
For example by:
- an automatic emergency shutdown
- stopping the
P.TUNE function by pressing the STOP key (press left or right key).
Procedure:
Key
Action
Description
MENU
Press
for approx. 3 s
Switching from process level
setting level
/
Select P.TUNE
RUN
Hold down
as long as countdown (5 ...) is
running
During the automatic adjustment the following messages are indi-
cated on the display.
"starting process tune" - Start self-optimization.
"identifying control process" - Process identification. Typical
process variables are determined from the response signal to a
defined stimulus.
"calculating PID parameters" - Structure and parameters of the
process controller are determined.
"TUNE ready" - Self-optimization was successfully completed.
Press any key
Return to the main menu (MAIN).
EXIT
Press
Switching from setting level
process level.
Table 50:
Automatic adjustment of X.TUNE
To stop
P.TUNE, press the left or right selection key
STOP
.
The changed data is saved in the memory (EEPROM) only when there is a switch to the process level,
by leaving the main menu (MAIN) using the left selection key
EXIT
. During the save process, the save
symbol is indicated on the display.
English
Type 8792, 8793