ATV320U07N4C ATV320 Variable Speed Drive, 3-Phase In, 0.1 → 599Hz Out, 0.75 kW, 400 V ac. The Altivar Machine ATV320 variable speed drives are simple, yet enhanced machines. They have been designed for original equipment manufacturers and meet simple and advanced applications requirements for three phase synchronous and asynchronous motors, from 0.18 to 15 kW. This type of VFD is the perfect solution to help you improve you machines effectiveness across a variety of applications.