SVOPES 4 KW Variable Frequency Drive. Superior Stability and Control. This SVOPES VFD converter is applicable to constant torque loads like hard-starting air compressors and HVAC units, as well as variable torque loads such as pumps and fans. Additionally, it functions as a motor speed controller and phase converter. The input is 1 or 3 phase, and the output is 3 phase. You can adjust the speed as you desire when using this VFD. It employs Sine wave PWN (SVPWM) in the control system and performs outstandingly. The product has also acquired CE certification. Outstanding Functionality, Silent Working Mode, Intelligent Display Screen, Comprehensive Protections.