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  • Star to Delta Motor Starter in Ladder Logic

Course Content


During the starting period of star delta starting, an induction motor is coupled to a star connection. The motor is then hooked in through a delta connection once it has reached the required speed. A star delta starter will start a motor with a stator winding that is connected in a star pattern.

If you swap any two conductors at the Circuit Breaker's load terminals, the rotation will be reversed. If you need to reverse the motor's spin, you don't have to bother about the 6 terminal conductors. Each of them will be connected to the Star Delta Starter's appropriate connector.

When the Start button is pressed, the PLC must start a motor. Motor Vibration High, Overload, and Motor Temperature High are the three interlocks. If any of the interlocks are activated, the PLC must instantly halt the motor. If the stop button is pressed, the PLC must halt the motor.

Star connected motors have a central connected point, known as a short circuit point or star point, and each winding receives phase voltages (230 volts), whereas delta connected motors have no connected point and each winding receives line voltages.

Reduced voltage starters like Star/Delta are perhaps the most prevalent. They are used to try to lower the start current provided to the motor at startup in order to reduce electrical supply disruptions and interference.

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