What is Star Delta Connection in PLC?
To protect the motor from these high starting currents we use a star and delta starter. Simply in Star connection, supply voltage to motor will be less. so we use star connection during starting of the motor, after motor running we will change the connection form star to delta to gain full speed of the motor.
What is Star Delta Connection With diagram?
A star delta starter is the most commonly used method for the starting of a 3 phase induction motor. In star delta starting an induction motor is connected in through a star connection throughout the starting period. Then once the motor reaches the required speed, the motor is connected in through a delta connection.
How many connection terminals are in the star delta starter?
Six Terminal
Disadvantages of Star-Delta starter Low Starting Torque (Torque = (Square of Voltage) is also reduce). Six Terminal Motor Required (Delta Connected). It requires 2 set of cables from starter to motor.
How does ladder logic work?
The PLC executes the program loaded into it one rung at a time. As the PLC begins to process the rung, it reads the instructions on the left and determines if the Logic on that side of the rung is set to TRUE. The Logic evaluates to TRUE when a hypothetical current is able to pass through the instructions.
What is a rung on a ladder logic diagram?
Horizontal lines in a ladder diagram are called “rungs,” each one representing a unique parallel circuit branch between the poles of the power supply. Typically, wires in control systems are marked with numbers and/or letters for identification.
Why 3 phase motor is star Delta Connection?
Star delta starter is mainly used to reduce the flow of current at the starting of the three-phase induction motor to avoid sparking, overheating, coil burning, etc. Now it is most important to understand that how a star-delta starter reduces the starting current of the induction motor.
Which contactor first on in star delta starter?
Power Circuit of Star Delta Starter In operation, the Main Contactor (KM3) and the Star Contactor (KM1) are closed initially, and then after a period of time, the star contactor is opened, and then the delta contactor (KM2) is closed. The control of the contactors is by the timer (K1T) built into the starter.
Can you write a PLC program for a star delta starter?
In this video series, you’re going to learn how to write a PLC program for a three-phase electrical motor that will utilize a star delta starter. The star-delta starter is a common method used in starting heavy three-phase motors.
What is the ladder logic for a star/Delta Motor control?
The ladder logic for a star/delta motor control is quite simple, and that is one of the advantages of using a PLC for motor control. Another great example of how to use a PLC for star/delta start of an AC motor is example #5 in the PDF file below.
What is a star delta starter?
Star delta starter is the popular method to start a large induction motor at a reduced voltage. Star delta starter means two separate stat of starting. First, the motor starts with a star connection and when it reaches up to 75% to 85% of its full load speed, the motor runs in delta connection.
How to make winding connection in Star and delta style in motor?
So in order to make winding connection in star and delta style in practical motor, the connection is shown above. Main contractor is used to supply power to the windings. It must be turned on all the time. Initially the star contactor is closed while delta contactor is open It makes the motor windings in star configuration.