ABB PLC AC31模块,07CR41
ABB PLC AC31模块,07CR41
ABB PLC AC31模块,07CR41
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欧姆龙变频器中过电流维护的目标首要指带有骤变性质的、电流的峰值超过了欧姆龙变频器的容许值的景象.因为逆变器材的过载才能较差,所以欧姆龙变频器的过电流维护是至关重要的一环,迄今为止,已开展得非常完善.
一、过电流的缘由
1、作业中过电流 即拖动体系在作业过程中呈现过电流.其缘由大致来自以下几方面:
① 电动机遇到冲击负载,或传动***呈现“卡住”表象,导致电动机电流的俄然添加.
② 欧姆龙变频器的输出侧短路,如输出端到电动机之间的连接线发作彼此短路,或电动机内部发作短路等.
③ 欧姆龙变频器自身作业的不正常,如逆变桥中同一桥臂的两个逆变器材在不断替换的作业过程中呈现异常。例如因为环境温度过高，或逆变器材自身老化等缘由，使逆变器 材的参数发作变化，致使在替换过程中，一个器材现已导通、而另一个器材却还未来得及关断，导致同一个桥臂的上、下两个器材的“直通”，使直流电压的正、负 极间处于短路状态。
2、升速时过电流 当负载的惯性较大，而升速时刻又设定得太短时，意味着在升速过程中，欧姆龙变频器的作业效率上升太快，电动机的同步转速敏捷上升，而电动机转子的转速因负载惯性较大而跟不上去，结果是升速电流太大。
3、降速中的过电流 当负载的惯性较大，而降速时刻设定得太短时，也会导致过电流。因为，降速时刻太短，同步转速敏捷降低，而电动机转子因负载的惯性大，仍保持较高的转速，这时相同可所以转子绕组切开磁力线的速度太大而发生过电流。
二、处置办法
1、起动时一升速就跳闸，这是过电流非常严峻的表象，首要查看
① 作业机械有没有卡住
② 负载侧有没有短路，用兆欧表查看对地有没有短路
③ 欧姆龙变频器功率模块有没有损坏
④ 电动机的起动转矩过小，拖动体系转不起来
2、 起动时不马上跳闸，而在运转过程中跳闸，首要查看
① 升速时刻设定太短，加长加快时刻
② 减速时刻设定太短，加长减速时刻
③ 转矩抵偿(U/F比)设定太大，导致低频时空载电流过大
④ 电子热继电器整定不妥，动作电流设定得太小，导致欧姆龙变频器误动作。
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