How to define u/f 5 points in Altivars ATV340, ATV930 to have quadratic torque curve for motor control?
ATV340 is dedicated for machine segment, that is why quadratic torque curve by default is not available. Similar, ATV930 dedicated for process solid movements does not have quadratic curve by default.
However, quadratic curve can be achieved by means of u/f 5 points selection and by defining 5 points so that curve will be close to quadratic. In fact, the real curve will consist of 6 linear pieces that will form "quadratic shape".
Use excel table where example is provided. If the curve is modified more towards linear, there will not be a problem to also drive quadratic torque application. But if the curve is too quadratic (e.g. very low voltage up to 40Hz) then the motor may have not enough magnetism and be weaker in torque.
It is not needed that the curve has to be perfect quadratic. Important is to have rated voltage at rated speed and shape rather closer to linear than too quadratic
Publié pour: Schneider Electric Belgium
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