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What are the requirements for the power supply used by CNC machine tools?

As we all know, high-speed machining technology is developing rapidly, and it is CNC machine tools that promote this development trend. How to make reasonable use of the various performances of CNC machine tools and maintain the accuracy of the machine tools is crucial.

The power supply is the energy support part that maintains the normal operation of the system. The direct result of its failure or failure is to cause the system to shut down or destroy the entire system. In addition, some operating data, setting data and processing programs of the CNC system are generally stored in the RAM memory. After the system is powered off, it is maintained by the backup battery or lithium battery of the power supply. Therefore, the downtime is relatively long, and unplugging or plugging in the power supply or memory may cause data loss and make the system inoperable.

At the same time, since CNC equipment uses a three-phase AC 380V power supply, safety is also an important part of the preliminary work of CNC equipment installation. Based on the above reasons, the power supply used by CNC equipment has the following requirements:

1. The voltage fluctuation of the power grid should be controlled between +10% and -15%. However, my country’s power supply has large fluctuations, poor quality, and hidden interference such as high-frequency pulses, plus human factors (such as sudden switching on the power supply). power outage, etc.). During power peak periods, such as about an hour before going to work or getting off work during the day, and at night, the deviation is often large, even reaching ±20%. It will cause the machine tool to alarm and prevent normal operation, and cause damage to the machine tool power supply system. It may even lead to the loss of relevant parameter data. This phenomenon has occurred in machine tools such as CNC machining centers or turning centers, and it occurs frequently and should be taken seriously.

It is recommended that workshops with centralized CNC machine tools be equipped with AC voltage stabilized power supply systems with automatic compensation and adjustment functions; a single CNC machine tool can be equipped with an AC voltage stabilizer alone.

2. It is recommended to connect mechanical and electrical equipment to a single power source. If other power sources need to be used to power certain parts of the electrical equipment (such as electronic circuits, electromagnetic clutches), these power sources should be taken from devices that form part of the mechanical electrical equipment (such as transformers, transducers, etc.) as much as possible. For large and complex machinery, including many machinery that work together in a collaborative manner and occupy a large space, more than one power supply may be required, which depends on the configuration of the site power supply. Unless the mechanical and electrical equipment is connected directly to the power source using a plug/socket, it is recommended that the power cord be connected directly to the power terminals of the power disconnect switch. If this is not possible, a separate terminal block should be provided 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.

3. CNC equipment’s requirements for compressed air supply system CNC machine tools generally use a lot of pneumatic components, so the factory building should be connected to a clean and dry compressed air supply system network. Its flow rate and pressure should meet the requirements. The compressed air machine should be installed away from the CNC machine tool. According to the layout of the factory building and the amount of air consumption, consideration should be given to installing equipment such as refrigerated air coal machines, air filters, gas storage tanks, and safety valves in the compressed air supply system network.

4. Requirements of CNC equipment for working environment Precision CNC equipment generally requires a constant temperature environment. Only under constant temperature conditions can the accuracy and processing accuracy of machine tools be ensured. Generally, ordinary CNC machine tools have no specific requirements for room temperature, but a large amount of practice shows that when the room temperature is too high, the failure rate of the CNC system greatly increases. A humid environment will reduce the reliability of CNC machine tools. Especially in humid environments with high acid gas, printed circuit boards and connectors will corrode, and electrical failures of machine tools will also increase. Therefore, some users in southern China take measures to dehumidify the CNC machine tool environment during summer and rainy seasons.

1) The working environment temperature should be between 0 and 35°C. Avoid direct sunlight on the CNC machine tool. The room should be equipped with good lighting equipment.

2) In order to improve the accuracy of processed parts and reduce the thermal deformation of the machine tool, if possible, the CNC machine tool can be installed in a relatively closed and air-conditioned factory building.

3) The relative humidity of the working environment should be less than 75%. CNC machine tools should be installed away from splashing liquids and prevent dripping in the factory.

4) Stay away from environments with excessive dust and corrosive gases.

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