uU W SB KM2 SB KMi FU KR KMI KM2 KMI KM2 KM I RP KM2 KR M (按下SB2一KM1得电并自锁一一电动机M运行) SB1动断触点断开一KM1失电一电动机M脱离三相电源,作惯性运转 按下SB1 SB1动合触点合上一KM2得电一电动机M接人直流电源,制动开始 释放SB1-KM2失电一电动机M去除直流电源,制动结束