National key product in new plan Reported by CCTV repeatedly 20 million guarantee by Min an insurance Integrate Save electricity 30% Used in the ministry of science and technology, the general hospital of China PLA and other more than 1000 energy saving program in countrywide If we can apply the energy saving device to every elevator, we will save 11.4billion kWhs energy, just like saving 3,800,000 ton standard coal, reduce 9,950,000 ton carbon dioxide, 32000 ton sulfur dioxide and 28,000 ton nitric oxide gas waste. SYSTEM FEATURES 1.We adopt PWM technology to output correct phase, and restrain higher harmonic effectively. 2.We adopt DSP CPU, which has high speed, precision, stability and anti-jamming ability. 3.We adopt self-diagnostic techniques to ensure the accurate of output voltage, and in case of current post back, to make the frequency convertor out of influence. 4.Voltage distortion: