| 摘要 |
A fluid pumping system includes a pump driven at a variable speed by a motor connected to the pump by a fluid cooled transducer. A regulator, connected to the transducer, controls, the speed of the pump responsive to an analog signal related in value to the flow rate of the pump and responsive to a control signal provided by a pump cycle controller. The pump cycle controller senses the level of a basin of fluid to be pumped and provides the control signal. The control signal is operative to start the pump when the fluid level reaches a predetermined starting level, to vary the pump speed responsive to changes in fluid levels higher than the starting level, and to run the pump at a minimum speed when the fluid level is between the starting level and a predetermined stopping level, lower than the starting level.
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