1、MULTI STAGE CONTROL: 8 stage programmable realize multi stage speed control, optional multiple operation modes, simple PLC operation, optional torsion or speed control mode 2、ANALOG INPUT OUTPUT: Come with standard RS485 RTU mode, multiple analog input or output of 0‑5v, 0‑10v, 4‑20ma, 0‑20ma 3、CONSTANT PRESSURE WATER AND WIND: Adopt PID control, constant pressure water supply, wind pressure constant pressure control, environmental protection and energy saving, low noise, low electromagnetic interference 4、STEPLESS REGULATION AND ENERGY SAVING: Low frequency and high torsion energy saving, multiple motor protection methods, stepless speed regulation 5、VARIOUS PROTECTION: Possess overcurrent, overvoltage and undervoltage, module failure, overheating, short circuit, input and output phase loss, abnormal adjustment of motor parameters, electronic thermal relay and other protection methods