Daikin AKZJ8Series Instruction Manual
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Contents
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30UsefulFunctions HandlingWhen temperature control is unstableAuto-tuning(P: Small, I: Large)Auto-tuning(P: Large, I: Small)T: TimeT: TimeT: TimeImproved temperature controlHigh deviationHigh deviationLow deviationWhen temperature controlresponse is slowTarget temperatureTarget temperatureTarget temperatureAuto-tuning (Conceptual drawing)P/I gain calculation coefficient (Response coefficient)Temperature control gain P (for low deviation)Temperature control gain I (for low deviation)Temperature control gain P (for high deviation)Temperature control gain I (for high deviation)n05n06n07n08n09–Checking tuning conditionsOperation for stabilizing initial statusOperation for collecting control target dataBefore startStep 0Step 1Step 2Calculation of temperature control gain Pand I from collected data, and writing gaininto each parameterStep 3–Operation status(Operation mode: Other than 9)Operation status(Operation mode: Other than 9: Same as before start)Operation status(Automatic operation for 2 minutes at 1% capacity)Operation status(Automatic operation for 10 minutes at 100% capacity)StopStopSelect a desired operation mode.∗[Note] 1., 3.∗[Note] 4.∗[Note] 5.∗[Note] 6.After completion T: Deviation (˚C)T: Deviation (˚C)T: Deviation (˚C)For Temperature Control Improvement —“Auto-tuning mode” Outline of the functionDepending on the system of the main machine, problems of “unstable temperature control” or “slow response in temperaturecontrol” may be raised. In such cases, it is possible that the temperature control gain∗ P or I setting is not suitable for the system.∗ Temperature control gain: Coefficient to determine a control value according to deviation (temperature difference)P: Proportional gainI: Integral gainIn such cases, you can improve the temperature control performance by using the “Auto-tuning mode” that provides moresuitable gain settings. Outline of operationThe auto-tuning mode executes the following steps.Check the Oil Cooling Unit status in each step.The auto-tuning mode automatically writes calculated values oftemperature control gain (P and I) into specified parameters.Calculated temperature control gain PInitial value: 7.0Calculated temperature control gain I Factory settings of the standard modelP: 120I: 120000ItemParameter No.Operation Unit status RemarksStep∗ To use the Oil Cooling Unit in normal conditions, this function is not required. |
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