What are the common faults and causes of the CNC system at work?

The numerical control system is the abbreviation of the digital control system, the English name is (NumericalControlSystem), according to the control program stored in the computer memory, executes part or all of the numerical control functions, and is equipped with a dedicated computer system with interface circuits and servo drive devices. Through the use of digital instructions composed of numbers, characters and symbols to realize the action control of one or more mechanical equipment, it usually controls the position, angle, speed and other mechanical quantities and switch quantities.

CNC systems and related automation products are mainly for CNC machine tools. The CNC machine tool is a mechatronic product formed by the penetration of new technology represented by the CNC system into the traditional machinery manufacturing industry: the machine tool equipped with the CNC system greatly improves the accuracy, speed and efficiency of parts processing.

Common faults and causes:

Position loop: This is the key link for the CNC system to issue a control command and compare it with the feedback value of the position detection system to further complete the control task. It has a high working frequency and is connected with peripherals, so it is prone to failure.

Common faults are: (Guide: Detailed explanation of the research and application of fastener tools)

①Position control ring alarm: It may be that the measurement circuit is open; the measurement system is damaged, and the internal damage of the position control unit.

②Move without issuing instructions, it may be caused by excessive drift, positive feedback, malfunction of the position control unit; damage of the measuring element.

③ Measuring component failure, generally manifested as no feedback value; the machine tool cannot return to the reference point; the possible cause of the alarm when the pulse is missed at high speed is that the grating or the reading head is dirty; the grating is broken.

Servo drive system: The servo drive system is related to the power grid, mechanical system, etc., and it has been frequently started and running during work, so this is also the part with more failures.

Power supply part: 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 the shutdown of the system or the destruction of the entire system. Generally in European and American countries, there are relatively few such problems, and there are not many considerations in this aspect of the design. However, in China, due to large power fluctuations, poor quality, and hidden interference such as high-frequency pulses, plus artificial Factors (such as sudden power failure, etc.). These reasons can cause power failure monitoring or damage. In addition, some operating data, setting data and processing programs of the CNC system are generally stored in 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 plugging or unplugging the power supply or memory may cause data loss and make the system unable to run.

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