My 3 phase motor(connected to VFD) makes high pitch sound when stopped.
The sound is not loud but audible and it's geting on my nerves.
Motor runs fine.

Is it suppose to be this way or there is something wrong with my setup?

Motor AC 3 phase 240V Leeson 2HP
VFD - KB Electronics - KBAC-27D
http://www.kbelectronics.com/data_sheets/9481.pdf

Thanks,
Alex