精选优质文档-倾情为你奉上自来水厂变频循环投切恒压供水系统Cyclical Switchover Constant-pressure Water Supply System(希望森兰变频器制造公司，四川成都 ) 杜俊明（广东中山中等专业学校，广东中山 ） 龙勇摘要：多泵变频恒压供水常用的两种方案，比较了两种方案的优劣。重点介绍多泵变频恒压供水循环投切的控制过程，以实例说明循环投切方案的可行性。Abstract: This paper compares two methods of realizing multi-pump constant-pressure water supply by an AC drive. Primarily describes the control process of cyclical switchover, and gives an example to confirm its feasibility.关键词：变频器，循环投切，应用实例Key words: Drive Cycl
