Advance control functions Closed-loop vector control. SVPWM pure sine wave control which eliminates low frequency electromagnetic noise. Optional active/passive PFC. Reliable operation It has short-circuit protection, over-current protection, blocking protection, power failure protection and son on. Isolated communication port design. Integrated phase loss and phase fault protection. Air cooling and fan cooling. Optional IP55 protection level. Convenient to use Offer customized design with built-in controller and external controller for option. The ultra-wide speed range from 10% to 100%. Configurable frequency hopping point. Energy saving and high efficient Automatic defrosting under heating mode. Three levels of anti-freezing function. It has high power functions of refrigeration and heating with energy-efficient and produces confort by constant room temperature control. Saving over 30% energy.