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Thank you all, waross, edison123, and LionelHutz!

Thanks Parchie! Sorry that i don't fully understand your calculation (chemical engineer myself). but it seems that you think we should put in original machine specs at 480V/60Hz in our VFD load setting, correct?

Thanks Jraef, The output frequency of VFD is 50Hz if I understand correctly. We will lose some speed, but 1490 is more than enough for our application (torque is more critical). How about the full load amps at 380V/50Hz? Should it be ~769amps or we also need to derate the amps at ratio 5/6?

Thanks edison123, do we need to derate the current? Both power and voltage is derated at 5/6, so current will be about the same?

we have a ABB AC 460V/60Hz motor run on 380V/50Hz power supply in China. The motor is connected to a ABB drive. The nameplate of motor rating is 522KW/769Amps/1790RPM/460V/60Hz. Because the V/Hz is almost the same between 460/60 and 380/50, i think the torque and FLA should be about the same...