... . 1.5KW-630KW ApplicationThis VFD is suitable for high-end application area with high precision, fast response, high torque, big inertia, potential load etc ... Fast adaptation to the varying load, high-efficiency voltage output, automatic regulation of V/F characteristics for variable load. Built-in RS ... 0.2g when below 20HzCooling methodForced air cooling FST-600 high-performance VFD for pump and fan