... ,ac motor control system,ac frequency drive,vfd,vsd,frequency converter. Application field: petroleum, landication, metallurgy, coal, mine, paper manufacture ... fault.17).parameters protection function18).Unique design, make frequency converter least pollution to the power.19).Outstanding behave 3- ... ), V/F control21) Overload capacity: 150% rated current for 60 s (SVC), 180% rated current for 10 s (VC) ...