Regarding response time of ATV71 drive, it depends on Acceleration time (ACC) and Rated motor freq. (FrS).
Example: if FrS =>50Hz and ACC =>60 Sec
Frequency reference => 50 Hz.
Then after run command, it will take 60 sec to reach 50Hz.
Example: if FrS =>50Hz and ACC =>60 Sec
Frequency reference => 30 Hz.
Then after run command, it will take 36 sec [(60x30)/50] to reach 30Hz.
Example: if FrS =>50Hz and ACC =>60 Sec
Frequency reference => 50 Hz.
Then after run command, it will take 60 sec to reach 50Hz.
Example: if FrS =>50Hz and ACC =>60 Sec
Frequency reference => 30 Hz.
Then after run command, it will take 36 sec [(60x30)/50] to reach 30Hz.