... SVC),PID control,Traverse control,RS485 communication,standard modbus AC Converter (1)Control mode: Sensorless vector control,V/F control ... .5Hz~15.0Hz* Reference Frequency Source: Keypad, analog input, serial communication, multi-step speed, PID and so on. The combination ... the output voltage stable when input voltage fluctuating* Up to 25 fault protection:Protection from over current, over voltage, ...