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西门子变频器上电运行后,不论是空载运行还是带负载运行都会在西门子变频器上显示过流报警,当此类故障发生时一般意味着西门子变频器中的igbt功率部件损坏,应当对西门子变频器中的功率部件及驱动部分进行详细的测量,检测存在问题的功率及驱动部件,更换新的部件后再详细的测量后才能再次上电,如驱动部分存在问题将会导致西门子变频器中新更换的igbt在上电后再次烧毁。造成此类故障的原因主要是由于西门子变频器在使用的过程中出现多次过载或是西门子变频器长时间处于电压波动较大的情况,从而导致西门子变频器中的器件烧毁,针对这一情况需要对西门子变频器的外侧电路进行检测,检测电机是否正常,并在西门子变频器的进线端加装电压保护装置,以避免西门子变频器烧毁。
西门子品牌的模块我们回收了10多年,给出的价格也是给我们的许多老客户能认可的,所以如果大家手上有闲置的产品可以直接联系我们,我们不会给你低价的,我们是希望*合作的。
在输出电路中往往需要注意对驱动电路和负载器件的保护:
1)对于继电器这类电感性负载,必须安装火花抑制器。
2)对于容性负载,应在信号输出负载线路中串联限流电阻。电阻阻值应确保负载承受的瞬时电流和电压被限制在额定值内。
3)在用晶体管输出直接驱动指示灯时,冲击电流可能损坏晶体管。为此应设置保护电阻以防晶体管被击穿。
4)当被驱动负载是电磁开关、电磁离合器、电磁阀线圈等交流负载,或虽是直流负载,但工作电压或工作电流超过输出信号的工作范围时,应先用输出信号驱动小型中间继电器(一般工作电压+24v),然后用它们的触点接通强电线路的功率继电器或直接去激励这些负载(见图1)。当然,如果所用plc装置本身具有交流输入、输出信号接口,或有用于直流大负载驱动的接口时,输出信号就不必经中间继电器过渡,即可以直接驱动负载器件。
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6es7332-5hd01-0ab0*销售