The CNC system of the Tongkuai Pipe Laser Cutting Machine serves as the "brain" of the equipment operation, and its alarm function is the key mechanism for timely feedback of faults. Alarm information covers various issues such as hardware failures, parameter abnormalities, and process errors. Improper diagnosis can easily lead to prolonged downtime. Diagnosis should follow the principle of "information interpretation first, hierarchical investigation later, and verification and repair later".
The primary step in alarm diagnosis is to accurately interpret alarm information. The CNC system will present faults in the form of code and text prompts, such as "E0123 axis motion out of tolerance" and "A0456 laser power abnormality". Firstly, it is necessary to refer to the dedicated alarm manual of the Tongkuai equipment to clarify the fault category corresponding to the alarm code - whether it is a mechanical actuator problem, sensor signal abnormality, or system parameter conflict. Simultaneously recording the scene of alarm triggering: during startup initialization, after pipe clamping, or during cutting process, can narrow down the scope of investigation.
Hardware alarms are the most common type, often involving sensors, driver units, and executing components. For example, the alarm of "axis positioning sensor no signal" may be caused by excessive gap between the sensor and the sensing plate, loose wiring, or sensor damage. When troubleshooting, first turn off the power and check the sensor circuit connector, unplug and tighten it again; Measure the gap with a feeler gauge and adjust it to the required range in the manual; If the alarm persists, replace the sensor with the same model and test the machine. For example, if the "chuck clamping sensor alarm" is triggered, it is necessary to check whether the chuck air pressure is normal and whether the clamping in place signal circuit is damaged. If it is still abnormal after elimination, the sensor position should be calibrated.
Parameter and program alarms need to focus on system settings and processing files. The alarm for 'processing parameters exceeding allowable range' is often caused by the failure to update parameters synchronously after changing the pipe specifications, or parameters being mistakenly modified. When processing, enter the numerical control system parameter interface, refer to the pipe specification manual to restore the default parameters, and focus on checking key items such as cutting speed, laser power, and axis motion speed. If there is a "program syntax error" alarm, it is necessary to check the imported cutting program, delete redundant code or regenerate the program to ensure that the program format is compatible with the system.
After diagnosis, it is necessary to verify through a trial run: clear the alarm record, restart the device, perform an empty run or small batch trial cut, and observe whether the alarm is triggered again. In daily prevention, it is recommended to establish an alarm log to record alarm codes, handling methods, and frequency; Regularly backup system parameters to avoid parameter loss caused by misoperation; Check the key sensor circuits monthly, keep the joints dry and clean, and reduce the incidence of alarm failures from the source.