雅满苏铁矿1台4 m~3电动挖掘机运转半年多,最近发生了1起电气故障,主机在正常运转时突然跳停,司机再次启动,又出现相同的现象。1 故障现象及系统工作原理电动挖掘机回转系统电气原理见图1。转换开关3HK_2扳到行走位置,慢慢推动主令控制器,发生以下3种情况:①直流继电器3YJ动作,重复出现“吸 Yaman Cycas 1 4 m ~ 3 electric excavator more than six months to run, the recent occurrence of an electrical failure, the host suddenly jump in normal operation, the driver started again, the same phenomenon occurs. 1 Symptoms and system works Electric excavator slewing system electrical principle shown in Figure 1. Transfer switch 3HK_2 to the walking position, slowly pushing the master controller, the following three cases occur: ① DC relay 3YJ action, repeated ”suction