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What is the lowest frequency for Altivar 12 drive to get nominal torque.

The speed range of Altivar 12 is 1..20
For a drive the speed range is the ratio of the output maximum frequency/minimum frequency where the nominal torque is available.
Altivar 12: speed range is to 1..20Hz with a nominal speed motor of 50 Hz =>50/20=2.5 Hz and 50/1= 50 Hz

So the torque curve is guaranty in the speed range of 2.5 Hz to 50 Hz.
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