Control systems for gates and the like including a motor overload monitoring circuit

A control system for use with a bidirectional gate driven by a reversible electric motor, comprising:

• selectively operable switch means for producing control signals to operate said gate;
• means responsive to said control signals for selectively energizing said motor;
• and,
• means for disabling said energizing means when the level of electrical current flowing through said motor exceeds a prescribed level, whereby to prevent current overload of said motor, said disabling means including
• (1) means for producing a measured level of voltage proportionate to the magnitude of current flowing through said motor,
• (2) means for generating a first reference level of voltage, said generating means including a first comparator having a pair of inputs, said producing means including a second comparator having an output,
• (3) first means coupled with said producing means and said generating means for comparing the magnitude of said first reference level of voltage with said measured level of voltage and for producing a first output signal when said measured level exceeds said first reference level, and,
• means responsive to said first output signal for interrupting the delivery of electrical current to said motor.