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I am using an Altivar 38 to operate a motor (22kw, 1465rpm, 50hz) on axial pump, Can I increase frequency above 50 Hz?

 ATV38 is designed with output frequency range from 0.1 to 500 Hz, attached is the specification page for ATV38, thus the drive can operate above 50 Hz, this is from the drive side.
From the motor side, you have to check this with the manufacturer because increasing the frequency of the motor above the rated frequency/speed could cause motor overload, heating & affect the mechanical parts of the motor, so some special motors are designed to operate above the rated speed that's why this has to be confirmed with the motor manufacturer.


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