Fault Diagnosis System Based on UN-150ZB Mobile Rail Flash Butt Welding

As the fault of the UN5-150ZB rail flash butt welding machine was difficult to be detected and diagnosed, a self-diagnosis system based on communication between PC and PLC was developed to realize fault detection and diagnosis for site operation. The system was implemented by transporting input and output information which including digital and analog, and states of PLC to PC. The computer diagnosis software could judge different fault types automatically on different diagnosis interface. Diagnosis results were printed on screen in text and graph that could provide information of fault types and phase. With the help of diagnosis results, welding productivity can be improved and problems of the equipment can be solved rapidly. Practical application showed that the self-diagnosis system provided a good solution to the fault detection and diagnosis.