| 摘要 |
A soft-start pump controller system (10) for controlling a pump motor includes a switching device for supplying power to the pump motor; a periodic duty cycle generator (18) for periodically actuating the switching device at a fraction of the full duty cycle to operate the pump at a reduced, quieter level; a sensor (16) for sensing the current drawn by the pump motor (12); a reference circuit (28); and a liquid detector (24) for detecting the presence of the liquid to be pumped, responsive to the sensor and the reference circuit, for overriding the periodic duty cycle generator and actuating the switching device to operate the pump motor continuously at full power when the motor current exceeds a predetermined level indicating liquid is present. |
