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:
- monitoring a pressure in the fluid system;
monitoring and adjusting an operating frequency of the motor to maintain the pressure at a pressure set point;
based on the monitored operating frequency, causing the pump to temporarily boost the pressure in the fluid system to a temporary boost set point for a first time period, the temporary boost set point being greater than the pressure set point;
determining whether the temporarily boosted pressure in the fluid system stays above the pressure set point for a second time period; and
causing the pump to enter a sleep mode when the temporarily boosted pressure stays above the pressure set point through the second time period.
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Abstract
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 is provided. The method includes monitoring a pressure in the fluid system, monitoring and adjusting an operating frequency of the motor to maintain the pressure at a pressure set point, and, based on the monitored operating frequency, causing the pump to temporarily boost the pressure in the fluid system to a temporary boost set point for a first time period. The method also includes determining whether the temporarily boosted pressure in the fluid system stays above the pressure set point for a second time period and causing the pump to enter a sleep mode when the temporarily boosted pressure stays above the pressure set point through the second time period.
950 Citations
15 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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monitoring a pressure in the fluid system; monitoring and adjusting an operating frequency of the motor to maintain the pressure at a pressure set point; based on the monitored operating frequency, causing the pump to temporarily boost the pressure in the fluid system to a temporary boost set point for a first time period, the temporary boost set point being greater than the pressure set point; determining whether the temporarily boosted pressure in the fluid system stays above the pressure set point for a second time period; and causing the pump to enter a sleep mode when the temporarily boosted pressure stays above the pressure set point through the second time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 control panel including a display, directional buttons, and an enter button; and a variable frequency drive circuit that controls operation of the pump, the variable frequency drive circuit connected to the control panel, the variable frequency drive circuit configured to; monitor a pressure in the fluid system, monitor and adjust an operating frequency of the motor to maintain the pressure at a pressure set point, the pressure set point being programmable by a user using the directional buttons and the enter button, based on the monitored operating frequency, cause the pump to temporarily boost the pressure in the fluid system to a temporary boost set point for a first time period, the temporary boost set point being programmable by a user using the directional buttons and the enter button, determine whether the temporarily boosted pressure in the fluid system stays above the pressure set point for a second time period, and cause the pump to enter a sleep mode when the temporarily boosted pressure stays above the pressure set point through the second time period. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification