What is the main function of machine tool control circuit? What protection does the machine tool achieve?

The main function of machine tool control circuit is to control high voltage with low voltage.

Common protection measures include: short circuit protection, overload protection, overcurrent protection, undervoltage protection, weak magnetic protection, etc.

Overload protection: The common overload protection element is thermal relay. When the motor rated current, the motor rated temperature rise, thermal relay does not act. When the overload current is small, the thermal relay needs a long time to act, and when the overload current is large, the thermal relay will act after a short time.

Short-circuit protection: Commonly used short-circuit protection components are fuses and automatic switches. When the circuit is short-circuited or seriously overloaded, the fuse will automatically blow, thus cutting off the circuit and achieving the purpose of protection. When the above fault occurs in the line, the automatic switch can automatically cut off the power supply quickly.

Extended data

Read the electrical control circuit diagram

1, look at the legend several times.

The illustration shows the names and numerical codes of all devices in the electrical control circuit of the machine tool. By reading the illustrations, we can get a preliminary understanding of which components are used in the electrical control circuit. Then through the digital coding of these components, find out the components in the electrical control circuit diagram, and then input a frequency to find out the mutual connection and control relationship.

2, distinguish between the main and secondary lines

When you get a machine tool electrical control circuit diagram, you should first divide the whole circuit, which can be divided according to the characteristics of the main circuit and the auxiliary circuit described above, so that it is easier to read the diagram. Then, according to the principle of looking at the main circuit first and then at the auxiliary circuit, you can look at the diagrams of each unit circuit.

In the reading auxiliary circuit, we can further understand how the auxiliary circuit controls the main circuit according to the actions of the control elements in each small loop, so as to have a more comprehensive and complete understanding of the whole control circuit.

3. Look at the main circuit first

The typical feature of the main circuit is that there is a circuit where the electrical appliances are located.