Automatic Star Delta Circuit Control Diagram With Timer Pdf
An automatic star delta starter is a type of motor starter that is used to start a three-phase induction motor in star connection and then automatically change it to delta connection after the motor reaches a predetermined speed. This type of starter is used to reduce the starting current of the motor, which can help to protect the motor and the electrical system.
The basic principle of an automatic star delta starter is that the motor is first started in star connection, which has a higher starting torque but a lower starting current than delta connection. Once the motor reaches a predetermined speed, the starter automatically changes the motor connection to delta connection, which has a lower starting torque but a higher running speed.
Automatic star delta starters are typically used for motors that have a relatively high starting torque and a relatively low running speed. Some common applications for automatic star delta starters include pumps, fans, and conveyors.
The following diagram shows a typical automatic star delta starter circuit. The circuit consists of a three-phase power supply, a contactor, a star-delta switch, a timer, and a control circuit.
The three-phase power supply is connected to the contactor. The contactor is a switch that is used to connect and disconnect the motor from the power supply. The star-delta switch is a switch that is used to change the motor connection from star to delta. The timer is a device that is used to delay the changeover from star to delta connection. The control circuit is used to control the operation of the contactor and the star-delta switch.
When the power is turned on, the contactor closes and connects the motor to the power supply in star connection. The motor starts in star connection and gradually accelerates to its full speed. Once the motor reaches its full speed, the timer starts and after a predetermined time period, the star-delta switch closes and changes the motor connection to delta connection. The motor then continues to run in delta connection at its full speed.
Automatic star delta starters are a simple and effective way to start three-phase induction motors. They can help to reduce the starting current of the motor, which can protect the motor and the electrical system. Automatic star delta starters are also relatively inexpensive and easy to install.
Here is a link to a PDF file that contains a more detailed explanation of automatic star delta starters:
[link to PDF file]
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