| 摘要 |
A method in connection with a pump drive connected to a container (1) or the like, wherein a frequency converter (2) is arranged to supply power to a pump (3) in such a manner that the pump flow (Q p ) is responsive to an estimated mean incoming flow ( Q est ) to the container (1). The method comprises the steps of draining the container (1), allowing the container (1) to fill during a predefined filling time ( t fill ) while the pump (3) is inactive, draining the container (1) again at a known pump (3) flow ( Q p,nom ), defining the drainage time ( t drain ), defining an estimated mean incoming flow ( Q est ) on the basis of the filling time (t fill ), drainage time ( t drain ) and known pump (3) flow ( Q p,nom ), setting the power supplied by the frequency converter (2) to the pump (3) to be such that the pump (3) flow ( Q p ) corresponds to the produced estimated mean incoming flow ( Q est ).
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