1,frequency converter VSD 2,small inverter VSD 3,CE ... SGS, ISO9001 VSD 220V 0.4-7.5KW small frequency inverter, converter..CE, SGS, ISO9001..Multi-function, high torque..accurate ... , silent vector control.. soft starter1 .small frequency inverter, small ac drive, small converter, small VSD --- (0.4-11KW) ... control switching online...Zero-servo lock function.The frequency of carrier wave can be up to 16k, ...