Danfoss VLT AQUA Drive FC 202 Programming Manual

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parameter 4-14 Motor Speed High Limit [Hz]. However, inpractice, it is limited by this setting.The proportional band (error causing output to changefrom 0–100%) can be calculated with the formula:1Proportional Gain × Max ReferenceNOTICESet the value for parameter 3-03 Maximum Referencebefore setting the values for the PID controller inparameter group 20-9* PID Controller.21-22 Ext. 1 Integral TimeRange: Function:20s*[0.01 -10000 s]Over time, the integrator accumulates a contri-bution to the output from the PID controller aslong as there is a deviation between thereference/setpoint and feedback signals. Thecontribution is proportional to the size of thedeviation. This ensures that the deviation(error) approaches 0.Quick response on any deviation is obtainedwhen the integral time is set to a low value.Setting it too low, however, may cause thecontrol to become unstable.The value set is the time needed for theintegrator to add the same contribution as theproportional for a certain deviation.If the value is set to 10000, the controller actsas a pure proportional controller with a P-bandbased on the value set in parameter 20-93 PIDProportional Gain. When no deviation ispresent, the output from the proportionalcontroller is 0.21-23 Ext. 1 Differentation TimeRange: Function:0 s* [0 - 10 s] The differentiator does not react to a constanterror. It only provides a gain when the feedbackchanges. The quicker the feedback changes, thestronger the gain from the differentiator.21-24 Ext. 1 Dif. Gain LimitRange: Function:5* [1 - 50 ] Set a limit for the differentiator gain (DG). The DGincreases if there are fast changes. Limit the DG toobtain a pure differentiator gain when changesare slow and a constant differentiator gain whenquick changes occur.21-26 Ext. 1 On Reference BandwidthRange: Function:5 %* [0 - 200 %] Enter the on-reference bandwidth. When thePID control error (the difference between thereference and the feedback) is less than the21-26 Ext. 1 On Reference BandwidthRange: Function:value of this parameter, the on-referencestatus bit is high.3.18.4 21-3* Closed Loop 2 Ref/Fb21-30 Ext. 2 Ref./Feedback UnitOption: Function:See parameter 21-10 Ext. 1 Ref./Feedback Unit fordetails.[0] *[1] %[5] PPM[10] 1/min[11] RPM[12] Pulse/s[20] l/s[21] l/min[22] l/h[23] m³/s[24] m³/min[25] m³/h[30] kg/s[31] kg/min[32] kg/h[33] t/min[34] t/h[40] m/s[41] m/min[45] m[60] °C[70] mbar[71] bar[72] Pa[73] kPa[74] m WG[75] mm Hg[80] kW[120] GPM[121] gal/s[122] gal/min[123] gal/h[124] CFM[125] ft³/s[126] ft³/min[127] ft³/h[130] lb/s[131] lb/min[132] lb/h[140] ft/s[141] ft/min[145] ftParameter Description Programming GuideMG20OB02 Danfoss A/S © 05/2018 All rights reserved. 1733 3