Pump controller system and method
A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when system parameters are exceeded and/or fault conditions occur, can detect fault conditions, and can store fault conditions for later retrieval.
1. A method of regulating a speed of a motor in a pump, the pump connected to a water distribution system, the method comprising:
measuring an actual pressure in the water distribution system;
determining whether the actual pressure is less than, greater than, or equal to a constant pressure setpoint;
setting the motor speed to zero frequency if the actual pressure is above a pre-set pressure value greater than the constant pressure setpoint; and
subtracting the actual pressure from a desired pressure to determine a pressure error if the actual pressure is less than the constant pressure setpoint;
determining an integral of the pressure error;
multiplying the integral by an integral gain to determine a first value;
multiplying the pressure error by a proportional gain to determine a second value;
summing the first value and the second value; and
generating an updated speed control command based on the sum of the first value and the second value.
2. The method of claim 1 and further comprising measuring the actual pressure between the pump and a water tank.
3. The method of claim 1 and further comprising generating an updated speed control command that includes a pulse-width modulated signal.
4. The method of claim 1 and further comprising generating an updated speed control command that includes a space vector pulse-width modulated signal.
5. The method of claim 1 and further comprising generating the updated speed control command in real-time.
6. The method of claim 1 and further comprising generating an updated speed control command that includes a motor drive frequency.
7. The method of claim 1 and further comprising determining whether the actual pressure is greater than a high band pressure or less than a low band pressure.
8. The method of claim 7 and further comprising generating an updated speed control command when the actual pressure is less than the low band pressure.
9. The method of claim 7 and further comprising generating an updated speed control command until the actual pressure is greater than the high band pressure.
10. The method of claim 1 and further comprising generating a motor command including the updated speed control command and a minimum calibrated speed value.
11. The method of claim 1 and further comprising measuring an actual pressure in a water distribution system connected to at least one of a well pump system, a municipal water system, a pool system, a spa system, a recreational vehicle water system, a marine craft water system, a turf or irrigation system, and a pressure booster system.