Burkert 8792 Operating Instructions Manual page 143

Type 8792, 8793
Start-up, operation
process controller Type 8793
b) P.TUNE in automatic mode
The operator is on the process operating level.
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Specify a process set-point value SP via the keyboard or via the analog set-point value input.
In.doing.so,.observe.the.setting.for.the.internal.or.external.set-point.value.default!
The selected set-point value SP should be near the future operating point.
According to the set-point value default the process variable PV changes on the basis of the PID parameters
preset at the factory.
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To satisfy the requirements mentioned in the chapter for obtaining optimum results, wait until the
stable state.
When PV is oscillating permanently, the preset value KP of the process controller should be reduced in the
P.CONTROL → PARAMETER menu.
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To observe PV, you can select the graphical display SP/PV(t) by pressing the arrow keys.
→ .
As soon as the PV is temporally constant, start the P.TUNE function (see the following chapter).
22.7.4.3. start the
WarnInG!
risk.of.injury.due.to.uncontrolled.process!
While the P.TUNE function is running, the control valve automatically changes the momentary degree of opening
and engages in the current 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).
The operator is on the configuration and parameterization level.
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In the main menu select the
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Hold down the right RUN key for approx. 3 s (countdown on display). The P.TUNE self-optimization function
runs according to the diagram indicated in the following Table 37:. At the end the TUNE ready message is
indicated.
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Press any key to return to the main menu.
To stop the P.TUNE self-optimization function, press the left or right key STOP key.
P.TUNE fundtion
P.TUNE function by pressing the arrow keys.
PV reaches a
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