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 stop or destroy the entire system. In addition, part of the numerical control system's operating data, setting data and processing programs 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. As a result, the downtime is relatively long, and plugging in and plugging in the power supply or memory may cause data loss and prevent the system from operating.
At the same time, because the numerical control equipment uses a three-phase AC 380V power supply, safety is also an important part of the pre-installation work of CNC equipment. Based on the above reasons, the power supply for the numerical control equipment has the following requirements:
First, the voltage fluctuation of the power grid should be controlled between +10% and -15%. While the power supply in our country fluctuates greatly and has poor quality, it also hides such disturbances as high-frequency pulses, plus human factors (such as sudden pulls). Gate off, etc.). During the peak hours of electricity, for example, during the day and one hour before work or before work, and even at night, there are often more excesses, even up to ±20%. Causes the machine to alarm and cannot perform normal work and damages the machine's power system. It even led to the loss of relevant parameter data. This phenomenon has occurred in machine tools such as CNC machining centers or turning centers, and has a high frequency of occurrence and should be taken seriously.
It is recommended to configure the AC voltage regulator power supply system with automatic compensation adjustment function in the centralized workshop of the CNC machine tool; a single CNC machine tool can be independently configured with an AC voltage regulator to solve.
Second, it is recommended to connect mechanical electrical equipment to a single power supply. If it is necessary to use other power sources to supply certain parts of the electrical equipment (such as electronic circuits, electromagnetic clutches), these power sources should be taken from devices (such as transformers, transducers, etc.) that are part of the mechanical electrical equipment as much as possible. For large complex machinery including many machines that work together in a coordinated manner and occupy more space, it may require more than one incoming power source, which is determined by the configuration of the site power supply.
Unless the mechanical 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 switch of the power switch. If this is not possible, set a separate terminal block for the power cord.
The handle of the power disconnecting 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 electricity in case of an emergency, reducing losses and casualties.
Third, numerical control equipment for 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. Its flow and pressure should meet the requirements. The compressed air machine is installed away from the CNC machine. According to the layout of the plant and the amount of gas used, consideration should be given to installing the refrigerated air in the compressed air supply system network to such equipment as coal machines, air filters, gas storage tanks, and safety valves.
Fourth, numerical control equipment requirements for the working environment The precision numerical control equipment generally has the constant temperature environment request, only in the constant temperature condition, can guarantee the machine tool precision and the processing degree. General general-purpose numerically-controlled machine tools have no specific requirements for the room temperature, but a great deal of practice shows that when the room temperature is too high, the failure rate of the numerical control system greatly increases.
Humid environment will reduce the reliability of CNC machine tools, especially in humid environment with large acid gas, which will cause printed circuit boards and connectors to rust, and electrical faults of machine tools will increase. Therefore, some users in southern China respond to the dehumidification of CNC machine tools in summer and rainy seasons.
1, the working environment temperature should be between 0 - 35 °C, to avoid direct sunlight on the CNC machine tools, the interior should be equipped with a good lighting equipment.
2. In order to improve the precision of the machined parts and reduce the thermal deformation of the machine tool, if conditions permit, the CNC machine tools can be installed in a relatively closed building equipped with air-conditioning equipment.
3, the relative humidity of the working environment should be less than 75%. CNC machine tools should be installed in a place away from liquid splashing and prevent drip leakage from the factory.
4, away from excessive dust and corrosive gas environment.
