Auto Dol Starter Full Line Voltage

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Related Motor Control Power Diagrams: STARDELTA Starter Without Timer Power, Control Diagrams Wiring Diagrams Control 3-Phase Motor from more than Two Places Power Control Diagrams Operation Working of Automatic Star Delta Starter From L1 The phase current flows to thermal overload contact through fuse, then OFF push button, On push button Interlocking contact 2, and then C3.

This way, the circuit is completed, as a result; Contactor coil C3 and timer coil (I1) is energized at once and the motor winding then connected in Star.

When C3 is energized, its auxiliary open links will be closed and vice versa (i.e.

Thus C1 Contactor is also energized and Three Phase Supply will reach to the motor.

Since winding is connected in Star, hence each phase will get 3 times less than the line voltage i.e.

V. Hence Motor starts safely.

The close contact of C3 in the Delta line opens because of which there would be no chance of activation of contactor 2 (C2).

After leaving the push button, Timer coil and coil 3 will receive a supply through Timer contact (Ia), Holding contact 3 and the close contact 2 of C2.

When Contactor 1 (C1) is energized, then the two open contact in the line of C1 and C2 will be closed.

For the specific time (generally 5-10 seconds) in which the motor will be connected in star, after that the Timer contact (Ia) will be open (We may change by rotating the timer knob to adjust the time again) and as a result; Contactor 3 (C3) will be off, because of which the open link of C3 will be close (which is in the line of C2) thus C2 will also energize.

Similarly, When C3 off, then star connection of winding will also open.

Auto Dol Starter Full Line Voltage

In addition, Contact 2 (which is in the line C3) will open, by which, there would not be any chance of activation of coil 3 (C3) Since the motor is connected in Delta now, therefore, each phase of the motor will receive full line voltage (400V) and the motor will start to run in full motion.

It draws two times starting current of the FLA (Full Load Ampere) of the connected motor.

It reduced the starting current to one-third (approximately) as compared to DOL (Direct ON Line Starter) Also read: Three Phase Motor Connection Reverse and Forward Power and Control wiring diagrams Two Speeds One Direction Three Phase Motor Connection Power and Control Diagrams Disadvantages Starting Torque is also reduce to one-third because starter reduce the starting current to one-third of the rated current as Line voltage also reduced to 57 (13) It required Six leads or terminals Motor (Delta Connected) For Delta connection, the supply voltage must be same as the rated motor voltage.

At switching time (From Star to Delta), if the motor does not reach at least 90 of its rated speed, then the current peak may be equally high as in Direct ON Line starter( D.O.L), thus it may cause harmful effects on the contactors contacts, so it would not be reliable.

We may not use star delta starter if the required (application or load) torque is more than 50 of the three phase induction motors rated torque Related Post: 2 Speeds, 2 Directions Multispeed 3-phase Motor Power Control Diagrams Characteristics Features of Star-Delta Starter The starting current is 33 of full load current for star delta starter.

The peak starting current is 1.3 to 2.6 of full load current.

Star-Delta Starter can be used only for low to high power three phase induction motors.

In Star Delta starter, Current peak and mechanical load on changeover from star delta Applications of Star Delta Starter As we know the main purpose of star delta starter is to start the three phase induction motor in Star Connection while run in Delta Connection.

While keep in mind that Star Delta starter can only be used for low to medium voltage and light starting torque induction motors.

In case of direct on line (D.O.L) start, the receiving current at motor is about 33 while the starting torque reduced about 25-30.

This way, Star Delta Starter can be only used for light load during starting the motor.

Otherwise, the heavy load motor wont start due to low torque which need to accelerate the motor to rated speed while converting to the Delta connection.

You may also read other power control diagrams below: What is Motor Starter Types of Motor Starters and Motor Starting Methods What is Soft Starter Its Working, Diagram and Applications Direct Online Starter DOL Starter Wiring Diagram for Motors What is a Contactor Types, Working and Applications Three Phase Motor Power Control Wiring Diagrams Tags Delta Motor Control Star Star Delta Starter Three Phase Timer Electrical Technology 55 5 minutes read Show More Facebook Twitter LinkedIn Tumblr Pinterest Reddit VKontakte Skype Messenger Messenger WhatsApp Telegram Share via Email Print Electrical Technology All about Electrical Electronics Engineering Technology.

Auto Manual Dol Starter