We have a Leeson VFD at work that also "whines" but the noise can be reduced
by adjusting the carrier frequency.

Based on a quick look at the manual for your VFD, it looks like the carrier
frequency may be fixed at 16 kHz, although the table on page 10 of the
manual suggests that either 16 or 8 kHz are possible. Perhaps the frequency
depends on the input voltage to the VFD (110 or 220 VAC). You might try
calling KB and asking them if there is anything that you can do about it.

Mike

"Alex" wrote in message
. com...
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?


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