Component Database > Pump definition > Pump data: performance curves

This sheet is for the entry of the operating points defining the pump model.

You may first choose the units of Head and Flowrate, according to your original data.

Then for each curve you should choose the Parameter (Voltage or Head). Curve modifications act on the highlighted curve chosen by the "Set curve" box (red points).

For constructing a curve, you are advised to put the data points at their approximate position using right-clicks of the mouse, and then specify their exact values in the editing boxes.

As the curves are rather linear (and due to cubic interpolations), multiplying the data points doesn't bring more accuracy. Usually 4 or 5 points/curve and 3 or 4 curves are quite sufficient.

In some cases Power thresholds (for flow production) are naturally defined by extrapolation of the data curve (for ex. in Flowrate=f(Power) curves). In other cases they are rather defined through the voltage threshold and the I=f(U) characteristics. The thresholds determination and behaviour around them is one of the more difficult features of the pump model.

NB: After this definition, please have a look on the graphs for checking the general model behaviour. If irregularities or inconsistencies are observed, it is possible that one or another points is not well defined. We have sometimes observed that original data are not well defined (aligned) in the datasheets.