PLC控制器3HNM07485-1
电解铝烟气净化系统采用四台离心风机,这四台排风机采用两用两备。本系统选用两台山东新风光电子科技发展有限公司生产的JD-BP38-800F型高压变频器,采用一拖二手动旁路方案。一台变频器拖动两台电机;当变频器出现故障时可以切换到工频运行;并且变频器旁路部分具有互锁功能,确保两台电机不出现同时驱动,同一电机不出现变频、工频同时驱动。
电解铝烟气净化系统变频改造采用1#、2#排风机共用一套高压变频器,3#、4#排风机共用一套高压变频器。以1#、2#排风机为例说明其控制思路,其一次系统接线图路如图2所示,通过切换高压隔离开关把高压变频器切换到要运行的排风机上去。如图所示高压变频器可以拖动1#排风机电动机实现变频运行,也可以通过切换拖动2#排风机电动机实现变频运行。两排风机电动机均具备工频旁路功能。
图2高压变频一次系统接线图
QF1和QF2分别为现场1#和2#排风机电源高压断路器;
QS11和QS21分别为1#、2#排风机电源高压隔离开关;
QS12、QS22、QS13、QS23为变频器旁路开关柜高压隔离开关;
变频器为风光JD-BP38-800F高压变频器。
高压变频器旁路开关柜用于工/变频切换。QS11和QS21为2个高压隔离开关,变频器运行时,要求QS11和QS21同时闭合。QS12闭合,QS22断开,QS13断开,1#排风机变频运行;QS12断开,QS13闭合,1#排风机工频运行;QS22闭合,QS12断开,QS23断开,2#排风机变频运行;QS22断开,QS23闭合,2#排风机工频运行;其中,QS12与QS13、QS22实现电气互锁,QS22与QS23、QS12实现电气互锁;将控制柜“远控/本控”开关打至“远控”位置,将相应排风机断路器“就地/远方”开关打至“远方”位置,可实现排风机的远控操作。
PLC控制器3HNM07485-1
PLC控制器3HNM07485-1
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PLC控制器3HNM07485-1