CABINET BUILT REGENERATIVE POWER CONVERTERS. VARIADORES DE FRECUENCIA REGENERATIVOS. The NX Compact Cube is a bi-directional (regenerative) power converter, which is used in both generating and motor applications. The single NX Compact Cube can be used with AC motors in power sizes up to 1,550 kW. The power range can be extended up to 5 MW by using the innovative DriveSync control concept for running four NX Compact Cube drives in parallel. Variadores de Frecuencia Venezuela.