Relying on the ability of the CNC system to quickly process data, multi-channel and fast signal acquisition and processing are carried out for the faulty part, and then the diagnostic program performs logical analysis and judgment to determine whether there is a fault in the system and locate the fault in time. The self-diagnostic functions of modern CNC systems can be divided into the following two categories:
1) Power-on self-diagnosis Power-on self-diagnosis means that from the start of each power-on to the normal operation preparation state, the diagnostic program inside the system automatically executes the CPU, memory, bus, I/O unit and other modules, printed circuit boards, Function test before operation of equipment such as CRT unit, photoelectric reader and floppy disk drive to confirm whether the main hardware of the system can work normally.
2) Fault information prompts When a fault occurs during the operation of the machine tool, the number and content will be displayed on the CRT display. According to the prompts, consult the relevant maintenance manual to confirm the cause of the failure and the troubleshooting method. Generally speaking, the richer the fault information prompted by the diagnostic function of the CNC machine tool, the more convenient it will be for fault diagnosis. However, it should be noted that some faults can directly confirm the cause of the fault according to the fault content prompt and refer to the manual; while the real cause of some faults does not match the fault content prompt, or one fault shows multiple fault causes, which requires maintenance personnel to Find out the inner connection between them and indirectly confirm the cause of the failure.
