Talking about anti-interference measures of numerical control device
The existence of the interference source affects the safe and stable operation of the numerical control system. Therefore, in the overall structural design of the system, various anti-interference measures such as hardware and software should be taken, such as the arrangement and layout of the printed circuit board; Interference design; selection of anti-interference devices; reduction of bus length, etc. That is, the power transformer is shielded by conductive and magnetic conductive materials; more filtering links are adopted for the power supply system and the I/O lines; photoelectric isolation measures are adopted between the microprocessor part and the I/O loop to effectively isolate the input The electrical connection between the outputs; the modular structure, detection and self-diagnosis circuit for the output module; the fault detection, signal protection and recovery measures for the software; and the screening and aging of the components in the manufacturing; Excellent CNC system. 90% of faults in numerical control devices and industrial control machines come from power supply interference and power supply failures. Powerful equipment can cause power supply system pollution, generate strong pulse interference, and affect numerical control equipment through transmission lines. It is necessary not only to take anti-interference measures for the numerical control device, but also to take measures to suppress the power supply system. Common anti-jamming technical measures are as follows: (1) Physical isolation. Increase the distance between the victim circuit (or device) and the interference source, because the interference intensity is inversely proportional to the square of the distance, and increase the distance between the interference source and the victim circuit as much as possible, which will greatly reduce the propagation of interference and reduce the system failure rate. Especially in the case of poor power supply, the use of voltage regulator equipment is effective for power supply fluctuations and instantaneous power outages. In order to suppress power supply noise and interference between the power supply and the earth cable, an isolation transformer can be connected between the power supply and the numerical control device. (2) Filtering. The filter suppresses input interference and various types of interference induced on the signal transmission line. Commonly used are low-pass filters and DC filters, which are usually installed between the power supply and the numerical control device. (3) Shielding. In order to protect equipment and components from external electromagnetic fields, isolation shielding measures are usually used. Electrostatic shielding. It is to eliminate the interference between the circuits due to the coupling of the sub-capacitors. Low frequency magnetic field shielding. For constant magnetic fields and low frequency magnetic fields, shielding can be achieved using ferromagnetic materials with high magnetic permeability. It limits the magnetic field lines to shielded conductors with small magnetic reluctance. In addition, this type of interference can be eliminated by using twisted pair. Electromagnetic shielding. The electromagnetic is absorbed or excluded by means of reflection or absorption. (4) Grounding. If the device connects its casing to the earth, it is protective grounding; if the system ground is connected to the earth, it is grounded to the system. Anti-interference can also be achieved by means of protective grounding or system grounding. (Finish) Ningbo Yejin Supply Chain Management Co.,Ltd , https://www.car-parts-accessories.com