... 's Siemens, Japan axial flow fan. 4, SVPWM optimization space vector control, less harmonic output, low tone shower running. 5, ease of ... operation, one year warranty and lifetime maintenance.*7C-3000 series frequency inverter applied at the metallurgy, plastomer,textile, food-stuff,petroleum, chemical ... of machine equipment.As AC asynchronous motors driving and speed control. Frequency inverter