... Inverter , AC Drive ,Soft Starter 2.Customer first,sincere cooperation! Frequency Inverter ,ac drive, soft starter IntrodutionFrequency Inverter is our newest ... FunctionSpecial built-in PI adjuster for closed-loop control. Controlled by keypad, 485 communication control box, PC and ... manipulation. User-defined analog input voltage signal and current signal all available, compound speed control and ...