220V frequency inverter 220V 3 phase frequency converter is special for the area with 200V to 240V power grid like in US, power range from 0.75kW to 55kW. This type of inverters function & parameter is same as the general purpose three phase 380V.
Three phase frequency inverter General purpose 3 phase 380V to 460V frequency inverter, power range from 0.75kW to 500kW with 0 - 400Hz output.
Adjustable speed drive Most applications with electric AC motor require variable speed in different working periods, like injection mode machines and greenhouse, it's a waste if the machines running in full load all the time, the best solution for this applications is installing adjustable speed drive with variable frequency output to control the motor in variable speed to save energy.
220V AC drive The 220V 3 phase AC drive is customized for special power grid like in United States which is difficult to get three phase 380V power. The input fluctuate rate can be 15 plus-minus.