Provided herein is a method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods, and an appliance performing the method. The method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods may include measuring a minimum value of a property representing load of the circulation pump at a predetermined first speed, measuring a maximum value of a property representing load of the circulation pump at a predetermined second speed, the second speed being higher than the first speed, determining a relation between said minimum value and said maximum value, and determining, from said relation, whether process water is present in the circulation pump.

A control system includes a processor with pump data for a parallel connected plurality of pumps in a database of an associated memory for implementing a dynamic priority number (DPN)-based pump selection algorithm for a method of pump selection for the plurality of pumps. The method includes calculating a DPN using pump data regarding a plurality of pump parameters for each of the plurality of pumps. The DPNs are dynamically updated when at least one of the pump parameters changes. The DPNs are used together with a current pump demand to dynamically select which of the pumps are to be turned on or off, and the dynamic selection is implemented. The DPNs can be calculated using a DPN equation.

A circulation pump assembly (22) includes an electrical drive motor (10) and an electronic control device (12) controlling the drive motor (10). The control device (12) is configured for the speed control of the drive motor (10) according to a control schema (I, II, III). The control device (12) includes a detection function (42) which is configured to detect a condition variable representing an operating condition, from a parallel flow path (16, 18, 20) with a second circulation pump assembly (22). The control device (12) is also configured such that it can change the control schema (I, II, III) on the basis of a condition variable detected by the detection function (42). Further an arrangement of at least two such circulation pump assemblies (22) and a method for the control of such two circulation pump assemblies (22) are provided.

Method and system for determining the real-time flow into a wastewater pump station using analog level sensing technologies. An Accurate Level Generator mechanism supplies an accurate mean value out of multiple readings for each level used to calculate the volume between levels. Two consecutive levels are used to calculate the volume between them using an Accurate Flow Calculator and the time it took to get from one level to the other. A Real Time Inflow Calculator adds results regarding the pumps in operation and overflow events, which are ways for the water to exit the pumping station. At a water level approaching where the pumps start or stop, or when abnormal events occur, a Predictive Abnormal Event Adjuster replaces the highly probable abnormal Real Time Inflow Result by a more stable and possible value, which is the last one calculated plus its variation over time.

A sump, ejector, or other pump monitor configured to monitor the amperage of electric current power supplied through the pump monitor to a pump and communicate one or more signals regarding the amperage or variations in amperage to a remote signal receiving device which indicate a predicted failure or actual failure of the pump. In various embodiments, the pump monitor operates with a remote pump failure warning system. The remote signal receiving device or remote pump failure warning system provides suitable warnings to one or more user access devices.

Disclosed are a control circuitry and control method applied to a pumping device, the pumping device, and aquarium equipment. The pumping device is used for pumping water and air. The control circuitry includes: a detection and feedback circuit that obtains a working state of the pumping device and transmits the working state to a signal processing circuit; the signal processing circuit that adjusts in real time a drive signal to be sent to a power drive circuit according to the working state information; and the power drive circuit that drives a motor in the pumping device to operate according to the drive signal. The motor is controlled to operate at a first rotational speed in a water pumping state, and to operate at a second rotational speed in an air pumping state, where the first rotational speed is lower than the second rotational speed.

The present disclosure relates to a drain pump driving apparatus and a laundry treatment machine including the same. A drain pump driving apparatus according to an embodiment of the present disclosure and a laundry treatment machine including the same include: an inverter converting a direct current (DC) voltage from a converter into an alternating current (AC) voltage based on a switching operation and to output the converted AC voltage to a drain motor; and a controller to control the motor to, when a drain channel in a drain pump is clogged, be temporarily stopped in a period during which a speed of the motor increases and then to repeatedly rotate and stop in a first direction the same as a start-up direction, and to repeatedly rotate and stop in a second direction opposite to the first direction when the drain channel is clogged even after the motor repeatedly rotates and stops in the first direction. Accordingly, when impurities are introduced into the drain pump, the impurities can be removed in a simple manner.

A system and method for operating centrifugal pumps related to net positive suction head (NPSH), including identifying a group of centrifugal pumps and deriving an equation for the group based on manufacturer data of the centrifugal pumps collectively in the group, the equation correlating NPSH required (NPSHr) with flowrate of pumped fluid, wherein the manufacturer data includes NPSHr for each centrifugal pump of the group as a function of the flowrate of the pumped fluid. The technique includes specifying a NPSH margin for NPSH available (NPSHa) above the NPSHr.

An apparatus for monitoring of a pump includes a control module, and an error detection unit, wherein a support vector machine based module is provided that receives an estimated output quantity data value from the control module, processes the estimated output quantity data value to provide a processed estimated output quantity data value via the support vector machine, and supplies the processed estimated output quantity data value to the error detection unit instead of the estimated output quantity data value of the control module.

The disclosure relates to a drive protection and management method of a pressurization system comprising at least two operatively independent hydraulic pumps, the method including setting a plurality of predetermined parameters by a user by means of an electronic control unit at each of the hydraulic pumps, detecting at least one pressure value by means of at least one pressure sensor at a delivery duct of each of the hydraulic pumps, determining a drive in a sequential and/or synchronized manner of the at least two hydraulic pumps by managing and interpolating, independently for each pump, these predetermined parameters and the at least one pressure value at each of the hydraulic pumps by means of each electronic control unit. The disclosure relates to a pressurization system as well, adapted to implement this method.