Fan and pump Frequency Converter. It features powerful PID regulation capabilities, a detachable control panel for easy use, stepless speed adjustment that eliminates traditional gear limitations, allowing for adjustments from 0-500HZ at will. It has robust current vector control performance, low noise, and excellent energy-saving effects. The 485 communication interface supports the MODBUS international standard communication protocol. It comes with multiple built-in water supply application macro commands and supports dual display.