1756-RMC3
1756-RMC3
1756-RMC3
工作原理:按外接按钮SB1,第一梯级母线侧的X000闭合,能流经常闭接点X001、Y001接通输出继电器Y000线圈。由于Y000线圈的闭合,并接于母线侧的Y000常闭接点闭合形成了自保关系,输出继电器Y000输出信号,控制外接KM1接触器带动正转运行。在X000闭合的同时,串接于第二梯级的X000的常闭接点断开,切除了可能的反转运行,起了互锁的作用。同时因Y000的闭合,串接于第二梯级的Y000常闭接点断开,其作用与正反转接触器辅助接点互锁相似。而Y000串接于第三梯级的Y000常开接点则闭合,作好了Y002的启动准备。若Y000常开接点没有闭合,则Y002的启动就没有可能,这是反转闭合限制的条件。
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Allen-Bradley 厦门泰尼电气有限公司
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