Light load control for well pump
专利汇可以提供Light load control for well pump专利检索，专利查询，专利分析的服务。并且A control for turning on and off a motor driving a well pump which includes high pressure and low pressure detectors. The detectors are coupled to the gate circuits of respective silicon controlled detectors, or SCR''s, which have their load circuits connected in a latching loop circuit which energizes a relay to operate the motor. To disable the relay when the pump is sucking air, an auxiliary SCR controls an auxiliary relay having normally closed contacts connected in the loop circuit. The auxiliary SCR is turned on by a source of positive voltage but a current transformer wired in series with the pump motor sets up a negative control voltage which is of sufficient level under normal current conditions to overpower the positive voltage to maintain the auxiliary SCR turned off. A capacitor connected to the gate insures against premature actuation of the gate by positive inrush voltage.，下面是Light load control for well pump专利的具体信息内容。
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