altivar 71 output voltage

[hicham hicham]

hi guys hope you all doing good so here my question
the input voltage of the VFD (altivar 71) is 400v but when start in mode run the output voltage is only 310v is it logic i think no i appreciate your cooperation an advance thanks

 

[SheffSimon]

hi guys hope you all doing good so here my question
the input voltage of the VFD (altivar 71) is 400v but when start in mode run the output voltage is only 310v is it logic i think no i appreciate your cooperation an advance thanks

Lots of vfd's are configured in v/f open loop control, meaning the motor is not fitted with a feedback device connected to the vfd. V/F control means that voltage is proportional to output frequency, so if your motor is running at less than rated frequency (50Hz typically) then the output voltage will be less than the rated motor voltage.