in simulation, single phase motor is indicated as lamp and R supply(ie as single phase supply). VAR_POWER_POT is adjusted to vary the voltage across VAR_POWER_POT to simulate R supply voltage. When voltage across VAR_POWER_POT is within range of >= MIN_R_RMS_VOLTAGE and <= MAX_R_RMS_VOLTAGE, then trigger TRIAC gate ON to start or continue run the motor and MOTOR_ON LED is used as an indicator. When voltage across VAR_POWER_POT is either < MIN_R_RMS_VOLTAGE, indicated by R_VOLTAGE_MIN LED or > MAX_R_RMS_VOLTAGE, indicated by R_VOLTAGE_MAX LED, then stop the motor by trigger TRIAC gate OFF, as R supply voltage is abnormal, which will damage the motor, others machines and circuits connected to R supply.
Schematics and simulation is done by using Proteus CAD. NOT EXPERIMENTED IN REAL TIME ENVIRONMENT.
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