The single - chip microcomputer control technology has been applied in the system to carry out monitoring and protective functions for the asynchronous motors controlled . combined with suitable peripheral interface , disposition and flexible software , the mcs can measure the current and voltage signals of the motors . based on the measurements , the computation , judgment and decision are made to implement the phase sensitive short circuit , overload , supply over - voltage , supply under - voltage , over - thermal , leakage lock - out and loss of phase protective function 系统采用单片机控制技术,完成所控制电动机的控制功能,并对所控制电动机的电压、电流等信号进行检测、计算、判断和处理,实现短路、断相、过载、欠压、过压、过热、漏电闭锁等保护功能,并提供本质安全型输入、输出接口,能与煤矿井下监测监控系统联网运行。