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Some Details And Common Sense That CNC Machine Tools Need To Pay Attention To In Terms Of Power Supply

- Aug 25, 2018 -

The power supply is the energy support part that keeps the system working properly. The direct result of failure or failure is the system downtime or the destruction of the entire system. In addition, part of the numerical control system operating data, setting data and processing programs are generally stored in the RAM memory, and after the system is powered off, it is maintained by a backup battery or a lithium battery of the power source. Therefore, the downtime is relatively long, and the power supply or the memory may be lost, and the system may not operate.

At the same time, since the numerical control equipment uses a three-phase AC 380V power supply, safety is also an important part of the preliminary work of the numerical control equipment installation. For the above reasons, the power supply for the numerical control equipment has the following requirements:

First, the grid voltage fluctuation should be controlled between +10% - 15%, while China's power supply fluctuations are large, the quality is poor, and there are hidden interferences such as high-frequency pulses, plus artificial factors (such as sudden pull Shutdown, etc.). During peak hours, such as an hour or so before going to work during the day or at night, there is often a lot of difference, even reaching ±20%. The machine is alarmed and cannot work properly, and damages the machine's power system. It even leads to the loss of relevant parameter data. This phenomenon has occurred in machine tools such as CNC machining centers or turning centers, and the frequency of occurrence is high, which should be taken seriously.

It is recommended to configure an AC regulated power supply system with automatic compensation adjustment function in the workshop where the CNC machine is concentrated. A single CNC machine can be separately configured with an AC voltage regulator.

Second, it is recommended to connect mechanical and electrical equipment to a single power supply. If it is necessary to supply some parts of the electrical equipment (such as electronic circuits, electromagnetic clutches) with other power sources, these power sources should be taken as far as possible from the components (such as transformers, transducers, etc.) that are part of the mechanical and electrical equipment. For large complex machines, including many machines that work together in a coordinated manner and occupy a large space, more than one source of power may be required, depending on the configuration of the site power supply.

Unless the mechanical and electrical equipment is directly connected to the power supply with a plug/socket, it is recommended that the power cord be connected directly to the power supply terminal of the power disconnect switch. If this is not possible, you should set up a separate terminal block for the power cord.

The handle of the power cut-off switch should be easily accessible and should be installed between 0.6M and 1.9M above the easy-to-operate position. The upper limit is recommended to be 1.7M. This can quickly cut off power in the event of an emergency, reducing losses and casualties.

Third, the numerical control equipment for the compressed air supply system requirements CNC machine tools generally use a lot of pneumatic components, so the plant should be connected to a clean, dry compressed air supply system network. The flow and pressure should meet the requirements. The compressed air machine should be installed away from the CNC machine. According to the layout of the plant and the amount of gas used, it should be considered to install frozen air in the compressed air supply system network in coal machines, air filters, gas storage tanks, safety valves and other equipment.

Fourth, the numerical control equipment for the working environment requirements Precision CNC equipment generally has a constant temperature environment requirements, only under constant temperature conditions, to ensure machine tool accuracy and processing. Generally, ordinary CNC machine tools have no specific requirements for room temperature, but a large number of practices have shown that the failure rate of the numerical control system is greatly increased when the room temperature is too high.

A humid environment can reduce the reliability of CNC machine tools, especially in humid environments with large sour gas, which can cause corrosion of printed circuit boards and connectors, and electrical faults in machine tools. Therefore, some users in southern China should take measures to dehumidify the CNC machine environment during the summer and rainy seasons.

1, the working environment temperature should be between 0 - 35 ° C, to avoid direct sunlight on the CNC machine tools, indoors should be equipped with good lighting equipment.

2. In order to improve the precision of the machined parts and reduce the thermal deformation of the machine tool, if there are conditions, the CNC machine tool can be installed in a relatively closed factory building with air conditioning equipment.

3. The relative humidity of the working environment should be less than 75%. CNC machine tools should be installed away from liquid splashes and prevent dripping.

4. Keep away from excessive dust and corrosive gases.