On Sat, 18 Mar 2006 03:06:42 GMT, Alex
wrote:

I don't know. I don't see anything about it in the manual.


Mike Henry wrote:
"Alex" wrote in message
oups.com...

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


Can you change the carrier frequency?


Have a closer look - practically all VFDs have a facility to
change this frequency. Low for maximum power handling and long
leads between VFd and load motor. Higher for minimum noise.

The data sheet is of no help.You need the full manual - there
may be as many as a 100 possible performance tweaks!

Names vary a bit - pulse frequency or carrier frequency are
the common ones. Some VFDs have a two tier menu system. The first
tier is easily accessible and contains the frequently used
control variables. The second tier contains the full range of
possibilities but can only be accessed after entering a special
access code.

Jim