Through comparison with constant power of voltage,the merits of the constant power of current were explained,moreover the electrical breakdowns that frequently happened in operating and reasons to take shape were analyzed.

This text introduces category and reason of electrical breakdown, deals with the methods of checking up the power supply, electric circuit and equipment and gives out some concrete countermeasures.

Study of analyzing mark evidence of electrical failure on automobile fire;

It introduces the important factors resulting in more than thirty casualties in a fire because of wrong operation and electrical failure.

System analytic method of electric fault diagnosis;

By maintenance of several years to Automatic welding machine MZ-1-1000,common electric fault cause and eliminating method are summarized in order to carry out correct maintenance and fast finish.

CNC Machine tool common electrical fault and analysis

This paper introduces the fuzzy theory and the expert system theory, which are utilized to find out fuzzy relationships between electrical fault phenomena and fault reasons, establish fuzzy relationship equations, realize its intelligent diagnosis, and simulated the operation by software.

According to the daily common characteristics of NC machine tools and fault classification,with practice and analysis of production,summed up CNC machine tools electrical fault investigation,analysis and ruled out the steps and practices.