MVI56-BAS

MVI56-BAS这个电路也需要时间继电器，启动的时候电机连接自耦变压器低压启动，延时以后与自耦变压器断开直接接入主线路实现全压运行。我们看一下控制电路部分，按下SB2以后，KM1自锁且时间继电器线圈得电开始计时。同时自耦变压器星接直接连电机低压启动，继电器KA的线圈串时间继电器的常开点，所以到达设定时间以后，KT的常开点闭合KA自锁，同时KA的常闭点断开KM1线圈失电KA的常开点闭合KM2线圈得电。KM2吸合以后主电源直接接电机实现全压运行。(图中的KA可以用接触器也可以用中间继电器)

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