Diagram of the control circuit of the motor's inching and continuous operation

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Physical picture 1

Circuit Diagram

Physical picture 2

Control requirements: Press the start button SB2 to start the motor, press the stop button SB1 to stop the motor; button SB3 jogs the motor to rotate.

In some cases with special process requirements, fine processing or adjustment work, the machine tool is required to operate in jog mode, but in the process of machine tool processing, the machine tool is required to operate continuously most of the time. That is, the motor is required to be able to operate in jog mode and operate continuously. At this time, the motor's jog and continuous operation control circuit is required .

We put the inching and continuous control functions together in one circuit, which can realize both the inching function and the continuous operation function. For example, in reality, under normal circumstances, the motor is running continuously. If it encounters a fault, maintenance , or some manual operation, the inching function is needed at this time, then this circuit can be realized. This circuit is available on our old turning, grinding, planing and milling machine tools. In this circuit, we know and learn a new component -intermediate relay. There are also many types of intermediate relays, which will not be introduced here. The intermediate relay plays a role in function and signal conversion. Its contacts cannot be used in the main circuit and can only be used in the control circuit.

When the SB2 button is pressed, the intermediate relay coil is energized and energized. At this time, the normally open contact is closed, achieving self-locking, connecting the contactor KM coil circuit, the contactor is energized, and the motor runs. At this time, the motor is in a continuous running state, so the function of the SB2 button is a continuous running function. Press the stop button SB1 to stop the motor.

When the SB3 button is pressed, the contactor KM1 circuit is connected and the motor runs, but when the button is released, KM1 loses power and the motor stops. Therefore, the function of the SB3 button is a jog function.

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Circuit Diagram

Physical picture 1

Physical picture 2

Control requirements: Press the start button SB2 to start the motor, press the stop button SB1 to stop the motor; button SB3 jogs the motor to rotate.

In some cases with special process requirements, fine processing or adjustment work, the machine tool is required to operate in jog mode, but in the process of machine tool processing, the machine tool is required to operate continuously most of the time. That is, the motor is required to be able to operate in jog mode and operate continuously, and the motor's jog and continuous operation control circuit is required at this time.

We have integrated the inching and continuous control functions into one circuit, which can realize both the inching function and the continuous operation function. For example, in reality, the motor runs continuously under normal circumstances. If it encounters a fault repair or some manual operation, the inching function is needed at this time, then this circuit can be realized. This circuit is available on our old turning, grinding, planing and milling machine tools. In this circuit, we know and learn a new component-intermediate relay. There are also many types of intermediate relays, which will not be introduced in detail here. The intermediate relay plays the role of function and signal conversion, and its contacts cannot be used in the main circuit, but can only be used in the control circuit.

When the SB2 button is pressed, the intermediate relay coil is energized and energized. At this time, the normally open contact is closed, achieving self-locking, connecting the contactor KM coil circuit, the contactor is energized, and the motor runs. At this time, the motor is in a continuous running state, so the function of the SB2 button is a continuous running function. Press the stop button SB1 to stop the motor.

When the SB3 button is pressed, the contactor KM1 circuit is connected and the motor runs, but when the button is released, KM1 loses power and the motor stops. Therefore, the function of the SB3 button is a jog function.

Control requirements: Press the start button SB2 to start the motor, press the stop button SB1 to stop the motor; button SB3 jogs the motor to rotate.

The implementation method of this section is different from the inching and continuous operation control circuit (I). SB3 is a compound button.

When the SB2 button is pressed, the contactor is energized and the auxiliary contacts are closed to form a self-locking function, realizing the continuous operation function. When the stop button is pressed, the motor stops. Therefore, the function of the SB2 button is a continuous operation function.

In the SB3 button in the picture, we can see that a composite button is used. In reality, buttons are generally composite buttons, with at least one pair of normally open contacts and one pair of normally closed contacts. So when this button is pressed, the normally closed contacts are disconnected first, and then the normally open contacts are closed. Because the button is a mechanical button, there is still a sequence. When the SB3 button is pressed, the normally open contacts are closed, the contactor coil is connected, and the motor runs. But at this time, the normally closed contacts of the SB3 button are disconnected, disconnecting the self-locking circuit of the KM1 contact. So after the button is released, the contactor loses power, realizing the inching operation function.