What happens if I adjust the switching frequency (SFR) on Altivar Process Drives?


15 October 2021

By altering the switching frequency (SFR) we can alter the performance of the motor
control law. Increasing switching frequency:

•    Reduces audible noise in the motor or output filter
•    Improves speed and torque precision, especially at higher output frequencies
•    Increases losses
•    Can result in EMC issues

Switching frequency:
•    Is adjustable in 0.1kHz steps
•    Can be set to automatically increase if the output frequency is greater than the nominal frequency of the motor
•    Can be randomly modulated to attenuate resonant frequencies causing noise