现代数控机床有较完备的监测系统，当发生异常时能发出相关报警信息，据此可查出发生故障的部位。但数控机床是一个集机械、电气、液压于一体的复杂系统，各部件之间相互影响，一个环节出问题往往影响整个系统，因此有时会出现报警提示不正确的现象，给维修工作造成困难。下面 Modern CNC machine tools have a more complete monitoring system, when an exception occurs when the relevant alarm information can be issued, based on which can be found fault location. However, CNC machine tool is a complex system integrating mechanical, electrical and hydraulic functions. The interaction among various components affects the entire system frequently. Therefore, sometimes the alarm is not correct, causing difficulties for maintenance work. the following