Feature: 1. Better Control: 8 stage programmable, multiple stages speed control, optional multiple operation modes, simple PLC operation, optional torsion and speed control mode. 2. Standard Modes: Comes with standard RS485 RTU mode, multiple analogue input and output, such as 0‑5V, 0‑10V, 4‑20mA, 0‑20mA. 3. Reliable Works: PID control, constant pressure control, environmental protection and energy saving, low noise, low electromagnetic interference. 4. Safe for Using: Low frequency and high torsion energy saving, multiple motor protection methods, stepless speed regulation. 5. Great Security: Enables protection against over current, over voltage and under voltage, module failure, overheating, short circuit, input and output phase loss, abnormal adjustment of motor parameters, etc. Specification: Item Type: Variable Frequency Drive Model: AT903-5.5KW Power: 5.5KW Input Voltage: 380V Output Voltage: 0-380V Frequency Modulation Range: 0-400Hz Maximum Output Current: 16A Shell Material: ABS Plastic Power Phases: 3 Phase Product Size: Approx. 25 x 17.5 x 16.5cm / 9.84 x 6.89 x 6.5in Applicable Machine: For motors, mixers, ball mills, water pumps, cranes, conveyors, air compressors, fans, CNC machine tools, etc. . Package List: 1 x Variable Frequency Drive1 x User Manual Note: 1. To choose a compatible motor, you must choose a 380V 3 phase motor with a power less than 5.5KW and adjustable speed. 2. Connect the power supply and the 3 phase motor according to the wiring method in the manual. 3. Select the appropriate operation mode according to the requirements of the application scenario, and refer to the manual for mode selection. 4. Power on, the speed as well as CW and CCW rotation of the motor can be adjusted according to the knob on the panel.