Control apparatus for an electrically operable device

Abstract

Abstract (AN ELECTRICAL CURRENT SENSOR FOR OPERATIVE CONNECTION TO AN ELECTRICAL DEVICE SUCH AS A MOTOR POWERED PUMP FOR SENSING CURRENT INPUT TO THE MOTOR. THE SENSOR INCLUDES A TRANSFORMER TO DETECT CURRENT INPUT AND AN AMPLIFIER TO INCREASE THE MEASURED CHANGE IN CURRENT LEVEL. THE SENSOR PRODUCES AN ERROR SIGNAL WHEN THE CURRENT EITHER FALLS BELOW OR EXCEEDS A PRE-ESTABLISHED LEVEL, AND A REFERENCE VOLTAGE SIGNAL FOR COMPRISON WITH THE ERROR SIGNAL, IN A SUMMATING CIRCUIT. A SWITCH IS CONNECTED TO THE SUMMATING CIRCUIT AND CAUSES ENERGIZATION OF AN ALARM WHEN THE CURRENT INPUT TO THE PUMP EXCEEDS OR FALLS BELOW THE PRE-ESTABLISHED VALUE. AN AUTOMATIC DISCONNECT DEVICE IS OPTIONALLY CONNECTED TO THE SENSOR AND MOTOR FOR AUTOMATICALLY DE-ENERGIZING THE MOTOR UPON SENSING OF THE UNDESIRABLE CURRENT LEVEL.) CONTROL APPARATUS RESPONSIVE TO CHANGES IN HE CURRENT SUPPLIED TO AN ELECTRICALLY ENERGIZED DEVICE. CURRENT SENSING MEANS PROVIDES AN A.C. VOLTAGE SIGNAL WHOSE MAGNITUDE IS A FUNCTION OF THE MAGNITUDE OF THE CURRENT. CIRCUIT MEANS IS PROVIDED FOR SUPPLYING A PLUSATING D.C. SIGNAL WHOSE MAGNITUDE IS A FUNCTION OF THE MAGNITUDE OF THE A.C. VOLTAGE SIGNAL. A TRIGGERABLE GLOW DISCHARGE DEVICE IS ADAPTED FOR BEING TRIGGERED BY THE PULSATING SIGNAL TO PROVIDE A GLOW DISCHARGE UPON THE PLUSATING SIGNAL AT- TAINING A PREDETERMINED MAGNITUDE. CONTROL MEANS INCLUDES A LIGHT-SENTIVE TRANSDUCER ADAPTED TO BE ILLUMINATED BY THE GLOW DISCHARGE FOR SUPPLYING A CONTROL SIGNAL. THUS THE CONTROL SIGNAL IS SUPPLIED WHEN THE CURRENT REACHES A PREDETERMINED MAGNITUDE. PREFERABLY, THE CONTROL MEANS INCLUDES APPATARTUS FOR AUTOMATIC DISCONNECTION OF THE DEVICE AFTER A PEDETERMINED TIME DELAY INTERNAL FOLLOWING SUPPLYING OF THE CONTROL SIGNAL.

Inventors

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