No water / dead head detection pump protection algorithm
First Claim
Patent Images
1. A method for a no water/dead head detection pump protection comprising:
- (1) receiving in a controller a feedback signal containing information about pressure produced by a pump and a signal containing information about motor speed and power consumption of the pump;
(2) detecting in the controller that a no water/dead head condition exists by checking if three conditions are satisfied, including;
(a) power consumption of the pump and motor is below full load,(b) the speed of the pump and motor is at full speed, and(c) the pressure of the pump is below a desired operating pressure set point;
(3) if all three conditions are satisfied, then providing a control signal to lower the speed of the motor and pump, and turning off the pump and motor if the pressure produced by the pump does not drop; and
(4) if either all three conditions (a), (b) and (c) are not satisfied, or the pressure produced by the pump drops when the speed of the motor and pump is lowered;
then determining that the water/dead head condition is not detected, and providing the control signal to continue to allow the pump and motor to run, and repeating step (1) of the method.
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Abstract
A method and apparatus are provided for controlling the operation of a pump in a pumping system, featuring sensing a no water or dead head condition of the flow of a medium in the pumping system operating at a set point pressure; and dynamically reducing the set-point pressure to a lower set point pressure that allows for the flow of the medium to continue at the lower set point pressure while further monitoring the flow of the medium through the pump to protect the pump against damage due to the no water or dead head condition.
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Citations
18 Claims
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1. A method for a no water/dead head detection pump protection comprising:
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(1) receiving in a controller a feedback signal containing information about pressure produced by a pump and a signal containing information about motor speed and power consumption of the pump; (2) detecting in the controller that a no water/dead head condition exists by checking if three conditions are satisfied, including; (a) power consumption of the pump and motor is below full load, (b) the speed of the pump and motor is at full speed, and (c) the pressure of the pump is below a desired operating pressure set point; (3) if all three conditions are satisfied, then providing a control signal to lower the speed of the motor and pump, and turning off the pump and motor if the pressure produced by the pump does not drop; and (4) if either all three conditions (a), (b) and (c) are not satisfied, or the pressure produced by the pump drops when the speed of the motor and pump is lowered;
then determining that the water/dead head condition is not detected, and providing the control signal to continue to allow the pump and motor to run, and repeating step (1) of the method. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A controller for providing a no water/dead head detection pump protection to a pump, comprising:
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a module configured to (1) receive a feedback signal containing information about pressure produced by the pump and a signal containing information about motor speed and power consumption; (2) detect that a no water/dead head condition exists by checking if three conditions are satisfied, including; (a) power consumption of the pump and motor is below full load, (b) the speed of the pump and motor is at full speed, and (c) the pressure of the pump is below a desired operating pressure set point; (3) if all three conditions are satisfied, then provide a control signal to lower the speed of the motor and pump and to turn off the pump and motor if the pressure produced by the pump does not drop; and (4) if either all three conditions (a), (b) and (c) are not satisfied, or the pressure produced by the pump drops when the speed of the motor and pump is lowered, then determine that the water/dead head condition is not detected, and provide the control signal to continue to allow the pump and motor to run. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A pumping system, comprising
a pump and motor configured to provide a signal containing information about a motor speed and power consumption; -
a pressure sensor configured to sense pressure produced by the pump, and provide a feedback signal containing information about the pressure produced by the pump; and a controller for providing a no water/dead head detection pump protection to a pump, comprising; a module configured to (1) receive the feedback signal containing information about pressure produced by the pump and the signal containing information about motor speed and power consumption; (2) detect that a no water/dead head condition exists by checking if three conditions are satisfied, including; (a) power consumption of the pump and motor is below full load, (b) the speed of the pump and motor is at full speed, and (c) the pressure of the pump is below a desired operating pressure set point; (3) if all three conditions are satisfied, then provide a control signal to lower the speed of the motor and pump and to turn off the pump and motor if the pressure produced by the pump does not drop; and (4) if either all three conditions (a), (b) and (c) are not satisfied, or the pressure produced by the pump drops when the speed of the motor and pump is lowered, then determine that the water/dead head condition is not detected, and provide the control signal to continue to allow the pump and motor to run. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification