Wiring Diagram Of Automatic Star Delta Starter

By | August 7, 2021



Wiring Diagrams of Automatic Star Delta Starting Explained


In electrical engineering, the automatic star delta starter is a special type of starter used to control the starting of motors. It eliminates the need for manual intervention and thus lessens the chance of electric shock. The wiring diagrams of the automatic star delta starters are equally essential as this is where the starter will receive its power supply. This article will provide you a detailed overview of the wiring diagram of an automatic star delta starter.



The Power Supply Required for an Automatic Star Delta Starter


The power supply for an automatic star delta starter is quite extensive and comprises of a main switch, overload relays, contactors, timer relays, protection components, and a series of other parts. The main power supply is usually supplied from a 415V AC three-phase source. The main source is then connected to a 3-phase motor starter or contactor with a set of additional components.



The Circuit Diagram of an Automatic Star Delta Starter


Before wiring your automatic star delta starter, you should be familiar with the circuit diagram. The circuit diagram of an automatic star delta starter consists of seven major components such as overload and current relays, timer relays, contactors, a transformer, an isolator and a starting logic. The primary function of each component can be seen in the following figure.




Circuit Diagram of Automatic Star Delta Starter


The overload and current relays are the part that monitors the current drawn by the motor and sends an alarm signal when the current exceeds a certain value. Timer relays are used to ensure a delay between the transition from star to delta, while contactors are used to cut off the supply of electricity to the motor once the starting process is over. The transformer is used to reduce the voltage, while the isolator prevents the return flow of electricity once the motor has been started. Finally, the starting logic is responsible for the development of the various paths for the motor to start.



Main Components of a Star Delta Starter Wiring Diagram


The wiring diagram of the automatic star delta starter is composed of several parts, each one having its own function. The different components used in the wiring diagram include:




  • Power supply

  • Overload relay

  • Timers

  • Contactors

  • Transformer

  • Isolator

  • Starting logic

  • Control wiring

  • Fuses



Each of these parts serves a specific purpose in the wiring diagram. The power supply provides the starter with a steady stream of electricity, while the overload relay monitors the current drawn by the motor and ceases the supply of power when it exceeds a certain value. Timers are employed to ensure a delay between the transition from star to delta and contactors are used to cut off the supply of electricity to the motor once the starting process is over. The transformer reduces the voltage, while the isolator prevents the return flow of electricity once the motor has been started. The starting logic develops the various paths for the motor to start and finally, the control wiring and fuses make sure that all the relevant connections are safe and secure.



Conclusion


Understanding the wiring diagram of an automatic star delta starter can be a challenging task. Nevertheless, it is important to know the wiring diagram in order to install the starter correctly. With this article, we have provided a detailed overview of the wiring diagram of an automatic star delta starter. We hope this article helps you understand the wiring diagram of the starter and get the job done quickly and safely.


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