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松川电器-控制一个电机延时的断电作用要用时间继电器,如何操作!

2013/12/2 9:44:02点击:

控制一个电机延时的断电作用要用时间继电器,如何操作!要求可以手自动转换(即可以自动延时断电,也可以手动控制)

所须以下器材:接触器,开始按钮,停止按钮,时间继电器,手动/自动档位转换开关,导线若干。

当所以材料都齐全的时候,那么如何接线就成了最关键的问题,手动部分的就不用说了,那么就給大家说一下自动部分的;
电源(L)↔时间继电器常闭一端→时间继电器常闭另一端↔接触器线圈一端→接触器线圈另一端↔电源(N)
原理:
1.当档位开关接入手动档DW-Manual→中间继电器KA1得电吸合→断开时间继电器KT电源,断开中间继电器KA2电源→按下启动按钮SB→接触器KM得电吸合并自锁→电机运行;按下停止按钮STP→接触器KM失电弹开→电机停止。
2.当档位开关接入自动挡DW-Auto→时间继电器KT得电计时,中间继电器KA2得电吸合→断开中间继电器KA1电源→接触器KM得电吸合→电机运行;时间继电器KT计时停止→接触器KM失电弹开→电机停止。
3.当电机故障→热继电器KH动作→切出控制电路→接触器KM失电弹开→电机退运。