After reaching the rated speed, a potential-free contact(compressor running )is reqired for control system.The contact must be closed in this state. 当达到额定转速后---suo要求的控制系统,在这种情况下,CONTACT 必须关闭 大家能帮我翻译这句话吗 After reaching the rated speed, a potential-free contact(compressor running )is reqired for control system.The contact must be closed in this state.