Method of Controlling a Pump and Motor
First Claim
1. A method of controlling a pump driven by a motor, the pump in fluid communication with a fluid system, the method comprising:
- determining whether the motor has reached a steady state operating frequency;
causing the pump to temporarily boost a pressure in the fluid system once the motor has reached a steady state operating frequency;
determining whether the pressure in the fluid system drops after being temporarily boosted; and
causing the pump to enter a sleep mode if the pressure does not drop after being temporarily boosted.
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Accused Products
Abstract
Embodiments of the invention provide a variable frequency drive system and a method of controlling a pump driven by a motor with the pump in fluid communication with a fluid system. The drive system and method can provide one or more of the following: a sleep mode, pipe break detection, a line fill mode, an automatic start mode, dry run protection, an electromagnetic interference filter compatible with a ground fault circuit interrupter, two-wire and three-wire and three-phase motor compatibility, a simple start-up process, automatic password protection, a pump out mode, digital input/output terminals, and removable input and output power terminal blocks.
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Citations
40 Claims
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1. A method of controlling a pump driven by a motor, the pump in fluid communication with a fluid system, the method comprising:
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determining whether the motor has reached a steady state operating frequency; causing the pump to temporarily boost a pressure in the fluid system once the motor has reached a steady state operating frequency; determining whether the pressure in the fluid system drops after being temporarily boosted; and causing the pump to enter a sleep mode if the pressure does not drop after being temporarily boosted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a pump driven by a motor, the pump in fluid communication with a fluid system, the method comprising:
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causing the pump to enter a sleep mode if a pressure in the fluid system does not drop after being temporarily boosted; determining whether the pump has entered the sleep mode during a predetermined time period; and shutting down the pump due to a pipe break fault if the pump has not entered the sleep mode during the predetermined time period. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of controlling a pump driven by a motor, the pump in fluid communication with a fluid system, the method comprising:
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determining a pressure in the fluid system when the pump starts; operating the motor in a line fill mode at a low frequency for a time period if the pressure in the fluid system is less than a minimum pressure set point in order to fill the fluid system; and operating the motor at a normal frequency after the minimum pressure set point is reached in order to increase the pressure to a normal pressure set point. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A controller for a pump driven by a motor, the pump in fluid communication with a fluid system, the controller comprising:
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a variable frequency drive circuit that controls operation of the pump; and a control panel connected to the variable frequency drive circuit, the control panel including an automatic start button and a stop button, the variable frequency drive circuit automatically operating in a line fill mode when the pump starts when the automatic start button is engaged, the variable frequency drive circuit disabling the pump when the stop button is engaged. - View Dependent Claims (33, 34, 35, 36)
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37. A method of controlling a pump driven by a motor, the pump in fluid communication with a fluid system, the method comprising:
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operating the motor at a normal operating frequency; determining an actual pressure in the fluid system; comparing the actual pressure to a pressure set point; and generating a dry run fault if the pressure set point cannot be achieved by operating the motor at the normal operating frequency. - View Dependent Claims (38, 39, 40)
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Specification