Danfoss VLT AQUA Drive FC 202 Programming Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

Contents

Parameter used Speed at design pointknownSpeed at design pointunknownParameter 22-80 Flow Compensation + +Parameter 22-81 Square-linear Curve Approximation + +Parameter 22-82 Work Point Calculation + +Parameter 22-83 Speed at No-Flow [RPM]/parameter 22-84 Speed at No-Flow [Hz] + +Parameter 22-85 Speed at Design Point [RPM]/parameter 22-86 Speed atDesign Point [Hz] + –Parameter 22-87 Pressure at No-Flow Speed + +Parameter 22-88 Pressure at Rated Speed – +Parameter 22-89 Flow at Design Point – +Parameter 22-90 Flow at Rated Speed – +Table 3.30 Speed at Design Point Known/Unknown22-80 Flow CompensationOption: Function:[0] * Disabled Setpoint compensation not active.[1] Enabled Setpoint compensation is active. Enabling thisparameter allows the flow-compensated setpointoperation.22-81 Square-linear Curve ApproximationRange: Function:100 %* [0 - 100 %] NOTICENot visible when running in cascade.Example 1Adjustment of this parameter allows theshape of the control curve to be adjusted.0=Linear100%=Ideal shape (theoretical).Control Curve(head)(flow)HQ130BA388.11100%P22-81 0%Illustration 3.71 Square-Linear Curve Approximation22-82 Work Point CalculationOption: Function:Example 1A130BA385.11P22-85/22-86Control CurveHMINHDESIGNSet PointnRATED_ fRATEDnDESIGN -fDESIGNQ(flow)H(head)Par.:22-83/22-84/22-87Illustration 3.72 Speed at System DesignWorking Point is KnownFrom the datasheet showing characteristics for thespecific equipment at different speeds, simplyreading across from the HDESIGN point and theQDESIGN point allows finding point A, which is thesystem design working point. The pump character-istics at this point should be identified and theassociated speed programmed. Closing the valvesand adjusting the speed until HMIN has beenachieved allows the speed at the no-flow point tobe identified.Adjustment of parameter 22-81 Square-linear CurveApproximation then allows the shape of thecontrol curve to be adjusted infinitely.Example 2Speed at system design working point is notknown: Where the speed at system designworking point is unknown, another reference pointon the control curve has to be determined basedon the datasheet. Looking at the curve for therated speed and plotting the design pressure(HDESIGN, Point C), the flow at that pressure, QRATED,can be determined. Similarly, by plotting thedesign flow (QDESIGN, Point D), the pressure HDESIGNParameter Description VLT® AQUA Drive FC 202188 Danfoss A/S © 05/2018 All rights reserved. MG20OB0233