News Category

CNC equipment is interference problem

The so-called interference, which is the effect of noise on the system outside the useful signal, the interference is mainly divided into internal and external interference.
Internal interference:
1, signal crosstalk
2, component layout is unreasonable, component quality is poor.
3, the coupling of adjacent loops.
4, the impact of digital and analog.
5, parasitic oscillation.
External disturbance is mainly:
1, electromagnetic interference, including the near distance system of electricity equipment off, passing vehicles, electromagnetic waves, etc..
2, power supply fluctuations.
3, environmental interference, vibration, temperature and humidity, etc..
Internal interference is related to the manufacture of the digital control system, which can be eliminated and suppressed as much as possible by careful design. Import machine can do this, and external interference is random, and NC structure has nothing to do, generally on the source of interference is also difficult to limit, only to the specific circumstances to take preventive measures.
External interference coupling mode:
1, public impedance coupling method. Due to the grounding system is different from the ground system, causing the common impedance, it is inevitable to produce the interference of the common impedance coupling.
2, electrostatic coupling way. Is the electric field through the capacitance coupling way, and the interference of the line.
3, electromagnetic induction coupling way. Due to the existence of mutual magnetic field between the power line and the signal line, the closed loop of the NC system generates the inductive potential, which is the interference voltage.
4, leakage coupling mode: mainly due to adjacent wires sometimes coupling capacitor insulation resistance is lowered, interference through the conductor resistance between a signal is transmitted into the line
Interference source interference to the use of interference sources, and therefore suppress interference from the following three aspects.
1, the source of the interference filter, damping, screen, and other means to reduce the interference of the source of interference.
2, the interference of the way to use isolation, screen, impedance matching and balance wiring, circuit decoupling and other measures.
3, the device can be used to improve the signal to noise ratio, increase the switching time, improve the power level, the implementation of power and signal filtering, and other ways

Previous:Up the knowledge! Mahogany furniture production process/