The power supply is the energy support part to maintain the normal operation of the system. The direct result of its failure or failure is the shutdown of the system or the destruction of the whole system. In addition, some operation data, setting data and processing programs of the CNC system are generally stored in the RAM memory. After the power failure of the system, they are maintained by the backup battery or lithium battery of the power supply. As a result, the downtime is relatively long, plug power or memory may cause data loss, so that the system can not run.
At the same time, because the CNC machine tool uses three-phase AC 380V power supply, so the safety is also an important part of the pre installation work of CNC equipment
- The fluctuation of power grid voltage should be controlled between + 10% and – 15%. However, the fluctuation of power supply in China is large, the quality of power supply is poor, and the interference such as high-frequency pulse is hidden, plus human factors (such as sudden switch off, etc.). During the peak period of electricity, such as about an hour before going to work or leaving work in the daytime and at night, there are often more out of tolerance, even up to ± 20%. It makes the machine alarm and cannot work normally, and damages the power supply system of the machine. It even leads to the loss of parameter data. This phenomenon has happened in CNC machining center or turning center, and the frequency is high, so we should pay attention to it.
It is suggested that the workshop with more centralized CNC machine tools should be equipped with AC voltage stabilizing power supply system with automatic compensation and regulation function; a single CNC machine tool can be equipped with AC voltage stabilizer separately to solve the problem.
- It is recommended to connect mechanical and electrical equipment to a single power supply. If it is necessary to use other power supply to supply some parts of electrical equipment (such as electronic circuit, electromagnetic clutch), these power supply should be taken from the components (such as transformer, transducer, etc.) that are part of mechanical and electrical equipment as far as possible. For large and complex machinery, including many machines that work together in a collaborative way and occupy a large space, more than one power supply may be needed, which depends on the configuration of the site power supply.
Unless the mechanical and electrical equipment is directly connected to the power supply by plug / socket, it is recommended that the power line be directly connected to the power terminal of the power cut-off switch. If this is not possible, a separate terminal block shall be provided for the power cord.
The handle of the power cut-off switch shall be easy to access and shall be installed between 0.6m and 1.9m above the easy operation position. The upper limit is suggested to be 1.7m. In this way, the power can be cut off quickly in case of emergency, and the losses and casualties can be reduced.
- CNC equipment for compressed air supply system requirements, CNC machine tools generally use a lot of pneumatic components, so the plant should be connected to clean, dry compressed air supply system network. The flow and pressure should meet the requirements. The compressed air machine should be installed far away from the CNC machine. According to the layout of the plant and the amount of gas consumption, it should be considered to install the chilled air in the coal machine, air filter, gas storage tank, safety valve and other equipment for the compressed air supply system network.
- The requirements of CNC equipment for working environment precision CNC equipment generally has the requirements of constant temperature environment, only in constant temperature condition, can ensure the accuracy and processing degree of machine tool. Ordinary CNC machine tools have no specific requirements for room temperature, but a lot of practice shows that when the room temperature is too high, the failure rate of CNC system increases greatly.
Humid environment will reduce the reliability of CNC machine tools, especially in the humid environment with large acid gas, it will rust the printed circuit board and connectors, and increase the electrical failure of machine tools. Therefore, some users in southern China should take dehumidification measures in summer and rainy season.
1) The working environment temperature should be between 0 ℃ and 35 ℃. Computer gong processing, mechanical parts processing, CNC machine tool processing, Dongguan high-speed computer gong processing should avoid direct sunlight on CNC machine tools, and the room should be equipped with good lighting equipment.
2) In order to improve the accuracy of machining parts and reduce the thermal deformation of the machine tool, if possible, the CNC machine tool can be installed in a relatively closed workshop with air conditioning equipment.
3) The relative humidity of working environment should be less than 75%. CNC machine tools should be installed in the place far away from liquid splashing, and prevent plant dripping.
4) Keep away from excessive dust and corrosive gas.
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