公开(公告)号：US10465690B2

公开(公告)日：2019-11-05

申请号：US15315418

申请日：2015-06-01

Applicant: XYLEM IP MANAGEMENT S.À R.L.

Inventor： Alexander Fullemann

IPC: F04D15/00 ,  F04D29/70 ,  F04D13/06 ,  F04D15/02 ,  F04D7/04

Abstract: A method for controlling a pump arrangement upon clogging. The arrangement includes a pump and a control unit. The pump includes a motor, and the control unit drives the motor. The motor during operation is associated with an operational parameter from which the motor torque may be derived. The operational parameter has a normal value PN during normal operation of the motor in a first direction. The method includes the steps of driving the motor in a first direction by the control unit, stopping the motor if a real value P of the operational parameter exceeds a predetermined clogging limit PI, driving the motor in an opposite second direction a predetermined flushing time TR by the control unit, and stopping the motor if the absolute value of the real value P of the operational parameter during the flushing time TR exceeds the absolute value of a first unfastening limit PL1.