US 10,480,518 B2Granted

Method for controlling a pump arrangement

AssigneeXylem IP Holdings LLC

InventorsAlexander Fullemann, Fredrik Soderlund, Mats Karlen

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Abstract

A method for controlling a pump arrangement comprising a pump having a motor and a control unit. The motor, when the pump is in an active state and the motor is driven in a first direction, is associated with a load factor that corresponds to an operating condition of the pump arrangement. The pump arrangement also includes a unit configured to monitor at least one operating parameter from which the load factor of the motor can be derived. The method includes determining a real value of the at least one operating parameter, determining if an externally applied force is acting on the motor to such an extent that an operating condition detrimental to the pump arrangement is initiated, effecting a state shift from the active state to an inactive state of the pump if an operating condition detrimental to the pump arrangement is initiated, the state shift including a step according to which the control unit, immediately after a detrimental operating condition is initiated, abruptly breaks the driving of the motor in the first direction.

Claims20

Dependent claims

A method for controlling a pump arrangement comprising a pump (2) and a controller (6), the pump (2) comprising a motor (7) and the controller (6) being arranged to drive said motor (7),

wherein said motor (7), at each individual instant of time, when the pump (2) is in an active state and the motor (7) is driven in a first direction, has a load factor that corresponds to an operating condition of the pump arrangement,
the method comprising the steps of:
monitoring at least one operating parameter from which the load factor is derived;
determining a real value of said at least one operating parameter, when the pump (2) is in said active state,
determining, using said real value of said at least one operating parameter, if an externally applied force is acting on the motor (7) to such an extent that one of a plurality of operating conditions of the pump arrangement is initiated when the load factor of the motor (7) exceeds a level such that continued operation will cause the pump to break, and
effecting a state shift from the active state of the pump (2) to an inactive state of the pump (2) if said one of the plurality of operating conditions is initiated,
wherein said state shift comprises the step of causing the controller (6), immediately after it is determined that said one of the plurality of operating conditions is initiated, to abruptly break the driving of the motor (7) in said first direction by a nominal rotational speed of the motor (7) being set equal to zero in the controller (6).

4 more elements

A method for controlling a pump arrangement comprising a pump (2) and a controller (6), the pump (2) comprising a motor (7) and the controller (6) being arranged to drive said motor (7),

wherein said motor (7), at each individual instant of time, when the pump (2) is in an active state and the motor (7) is driven in a first direction, has a load factor that corresponds to an operating condition of the pump arrangement,
the method comprising the steps of:
monitoring at least one operating parameter from which the load factor is derived;
determining a real value of said at least one operating parameter, when the pump (2) is in said active state,
determining, using said real value of said at least one operating parameter, if an externally applied force is acting on the motor (7) to such an extent that one of a plurality of operating conditions of the pump arrangement is initiated when the load factor of the motor (7) exceeds a level such that continued operation will cause the pump to break, and
effecting a state shift from the active state of the pump (2) to an inactive state of the pump (2) if said one of the plurality of operating conditions is initiated,
wherein said state shift comprises the step of causing the controller (6), immediately after it is determined that said one of the plurality of operating conditions is initiated, to abruptly break the driving of the motor (7) in said first direction by a nominal rotational speed of the motor (7) being set equal to zero in the controller (6),
determining that the externally applied force is acting on the motor (7) to such an extent that when the load factor of the motor (7) exceeds a predetermined level in response to solid matter being caught in the pump or an object is at least partially blocking the pump,
initiating another one of the plurality of operating conditions when based on said real value of said at least one operating parameter, and
effecting a state shift from the active state of the pump (2) to a cleaning state of the pump (2) when the another one of the plurality of operating conditions is initiated.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/367,982Filed 21 Dec 2012
Priority: SE 115125422 Dec 2011
Published: US 2014/0369854 A118 Dec 2014
Granted: 19 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F04D 15/0254
Responsive to a condition of the pump: the condition being speed or load
F04D 7/04
Of centrifugal type: the fluids being viscous or non-homogenous
F04D 13/08
The pump being electrically driven: for submerged use
F04D 15/0066
Control, e.g. regulation, of pumps, pumping installations or systems: by changing the speed, e.g. of the driving engine

Family

US 2014/0369854 A1Pre-grant publication · published 18 Dec 2014
US 10,480,518 B2This patent

From the US filing history. Foreign family members aren’t listed.

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