on video Delayed start circuit of a three-phase motor

 Delayed start circuit of a three-phase motor

Starting a three-phase two-way asynchronous motor

In industry, many pieces of equipment require driving with an electric motor. Whether it is a ventilation, an elevator, certain applications require reversing the direction of rotation of the three-phase asynchronous motor. Discover the principle of three-phase asynchronous two-way motor starting with this interactive diagram in HTML5 version.

Presentation of power and control diagrams:

The electrical diagram proposed in the animation is interactive, it helps to understand the operation of a two-way start of a three-phase asynchronous motor.

All of the protection devices (fuse holder disconnector, thermal-magnetic circuit breaker) and the control devices (emergency stop or push buttons) can be controlled in order to start the asynchronous motor.

You can act on the electrical symbols or directly on the devices (push button, circuit breaker, etc.) to see what is happening on the actuators (contactors) or receivers (motor or indicator lights). The chronogram is used to view the states of different devices as a function of time.

Direct starting of an interactive asynchronous motor:

To power the motor, you must first close the motor circuit breaker (thermal magnet) marked Q1. By closing the fuse holder F1, the primary of the transformer is under voltage, it thus ensures the transformation of the 400V of the voltage between phase into 24V at the secondary of the transformer T1 (step-down transformer).

To power the control circuit, the fuse holder marked F2 must be closed. To make the asynchronous motor M1 rotate in the first direction of rotation, push button S2 must be pressed (example up). The coil of the motor contactor KM1 being powered, this changes the state of the contacts of the contactor (power and auxiliary contacts). Thanks to the self-maintaining (NO auxiliary contact of KM1) in bypass with the push button S2, it is not necessary to keep the push button pressed to supply the motor M1. To stop the rotation of motor M1, either press the red push button marked S1 or press the emergency stop marked S0.

To rotate motor M1 in the second direction of rotation, press the green push button marked S3 (example down). This energizes the contactor coil marked KM2. Thus the power contacts as well as the NO auxiliary contacts of KM2 close, conversely the NC auxiliary contact of KM2 opens. To stop the motor, press the red push button S1 or the emergency stop S0.

If an overload is detected by the thermal-magnetic circuit breaker, this is stopped by opening the Q1 circuit breaker of the power circuit (cutting the assembly power supply).

 Delayed start circuit of a three-phase motor

Starting a three-phase two-way asynchronous motor

In industry, many pieces of equipment require driving with an electric motor. Whether it is a ventilation, an elevator, certain applications require reversing the direction of rotation of the three-phase asynchronous motor. Discover the principle of three-phase asynchronous two-way motor starting with this interactive diagram in HTML5 version.

Presentation of power and control diagrams:

The electrical diagram proposed in the animation is interactive, it helps to understand the operation of a two-way start of a three-phase asynchronous motor.

All of the protection devices (fuse holder disconnector, thermal-magnetic circuit breaker) and the control devices (emergency stop or push buttons) can be controlled in order to start the asynchronous motor.

You can act on the electrical symbols or directly on the devices (push button, circuit breaker, etc.) to see what is happening on the actuators (contactors) or receivers (motor or indicator lights). The chronogram is used to view the states of different devices as a function of time.

Direct starting of an interactive asynchronous motor:

To power the motor, you must first close the motor circuit breaker (thermal magnet) marked Q1. By closing the fuse holder F1, the primary of the transformer is under voltage, it thus ensures the transformation of the 400V of the voltage between phase into 24V at the secondary of the transformer T1 (step-down transformer).

To power the control circuit, the fuse holder marked F2 must be closed. To make the asynchronous motor M1 rotate in the first direction of rotation, push button S2 must be pressed (example up). The coil of the motor contactor KM1 being powered, this changes the state of the contacts of the contactor (power and auxiliary contacts). Thanks to the self-maintaining (NO auxiliary contact of KM1) in bypass with the push button S2, it is not necessary to keep the push button pressed to supply the motor M1. To stop the rotation of motor M1, either press the red push button marked S1 or press the emergency stop marked S0.

To rotate motor M1 in the second direction of rotation, press the green push button marked S3 (example down). This energizes the contactor coil marked KM2. Thus the power contacts as well as the NO auxiliary contacts of KM2 close, conversely the NC auxiliary contact of KM2 opens. To stop the motor, press the red push button S1 or the emergency stop S0.

If an overload is detected by the thermal-magnetic circuit breaker, this is stopped by opening the Q1 circuit breaker of the power circuit (cutting the assembly power supply).