초록 ▼

An electronic control system for a multiple speed fluid pump and motor. A parameter of the motor, the pump, or the fluid which is expelled from the pump is measured by a sensor. When a predetermined value of the parameter is reached, the sensor provides a trip signal to a timer circuit. The timer ci

An electronic control system for a multiple speed fluid pump and motor. A parameter of the motor, the pump, or the fluid which is expelled from the pump is measured by a sensor. When a predetermined value of the parameter is reached, the sensor provides a trip signal to a timer circuit. The timer circuit provides a drive signal to a switch while the trip signal is present and for a specified period of time after the trip signal is removed. The switch, while it is receiving the drive signal, connects the motor driving the pump into a high speed configuration. After the specified period of time, the switch will cause the motor to change to low speed operation.

대표청구항 ▼

A control system for two speed fluid pump having a first electrical power input for operation at a first low speed and a second electrical power input for operation at a second, high speed, comprising: means for automatically sensing one of a rate of flow and a pressure of a fluid expelled from said

A control system for two speed fluid pump having a first electrical power input for operation at a first low speed and a second electrical power input for operation at a second, high speed, comprising: means for automatically sensing one of a rate of flow and a pressure of a fluid expelled from said pump and providing a trip signal at a predetermined value of one of said rate of flow and pressure; an oscillator; a counter having a clock input coupled to said oscillator, a reset input coupled to said sensing means, and an output; a relay for selectively coupling said first and second electrical power inputs to a power supply, said relay having a winding coupled at a first end to a second power supply; and a drive transistor having a collector coupled to a second end of said winding, an emitter coupled to ground, and a base coupled to said output of said counter.