After the CNC system and the servo module are damaged, the replacement module is usually used to solve the sudden failure in the field. However, in the case of lack of spare parts, sometimes the method of changing the emergency is adopted to restore the numerical control machine tool, which not only ensures the normal operation of the equipment, but also shortens the stoppage of the machine tool, thereby saving maintenance costs. Example 1, CH097 CNC lathe, which is driven by SINUMERIK810GA3+6SC6504+6SC610. There is a period of failure, when it is good or bad, when the fault occurs, the spindle