With the energization of the relay RL2, the voltage developed across the C2 energizes the relay R元 and thus, supply is given to the motor. The DC voltage developed across the capacitor C2 through the bridge rectifier will energize the relay RL2.

Switch S1 is used for switching ON the supply through transformer T2 and N/C contacts of the relay RL1. The electronic starter for the motor circuit block diagram is shown below. In these conditions the current sensor trips the circuit for protecting the motor. A current sensor in the circuit is used to limit the current drawn by the motor because in a few cases such as failure of the bearing, pump defect or any other reason, the current drawn by the motor exceeds its normal rated current. Electronic Starter Circuit WorkingĮlectronic starter is used for motor protection from overload and short-circuit conditions. It reduces the starting current to the AC induction motors and also reduces the motor torque. The starter is a device which is used for switching and protecting the electric motor from the dangerous overloads by tripping. Protection Scheme of Single phase Induction Motor It is more costly, but still facilitates high starting and breakdown torque along with smooth running characteristics at high horsepower ratings. Start capacitor provides starting boost to motor and PSC provides high running to the motor.

Run capacitor is connected in series with the start winding or auxiliary winding, and a start capacitor is connected in the circuit using a normally closed switch while starting the motor. The features of the capacitor start and PSC methods can be combined with this method. Capacitor Start Capacitor Run Capacitor Start Capacitor Run Motor

10 hp single phase motor starter