1. Deterministic failure. Deterministic failure refers to the failure of the hardware in the host of the control system or the failure that will inevitably occur in the CNC machine tool as long as certain conditions are met. This kind of failure phenomenon is the most common in the CNC machine tool, but because it has certain rules, it also brings convenience to maintenance. Deterministic faults are unrecoverable. Once a fault occurs, if it is not repaired, the machine tool will not automatically return to normal. However, as long as the root cause of the fault is found, the machine tool can return to normal immediately after the maintenance is completed. Correct use and careful maintenance are important measures to prevent or avoid such failures.
2. Random failure. Random failure refers to the accidental failure of CNC machine tools in the working process. The cause of this kind of fault is hidden, so it is difficult to find its regularity, so it is often called "soft fault", and the cause analysis and fault diagnosis of random fault are difficult. Generally speaking, the occurrence of random faults is often related to many factors, such as the installation quality of components, the setting of parameters, the quality of components, the imperfect software design, the influence of working environment and so on. The random fault is recoverable. After the fault occurs, the machine tool can usually return to normal by restarting and other measures, but the same fault may occur during operation.
Strengthening the maintenance and inspection of the CNC system, ensuring the sealing of the electrical box, reliable installation and connection, and correct grounding and shielding are important measures to reduce and avoid random faults.
