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

"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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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?

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?


--
http://NewsGuy.com/overview.htm 30Gb $9.95 Carry Forward and On Demand Bandwidth

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

I think I found it in this manual:
http://www.baldor.com.au/products/pd...D%20manual.pdf

Motor Frequency Multiplier Selection (J6) – Jumper
J6 is factory set to the “1X” position, for motor frequency
corresponding to the frequency setting of Jumper J5 (50
or 60 Hz). To double the output frequency to the motor,
set Jumper J6 to the “2X” position (100 or 120 Hz). See
Figure 14.
Note: When doubling the motor frequency, the motor
will produce full torque up to its rated speed. The torque
will be linearly reduced to 50% at the maximum doubled
frequency.

Am I right?


wrote:

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

On Sat, 18 Mar 2006 18:05:00 GMT, Alex
wrote:

I think I found it in this manual:
http://www.baldor.com.au/products/pd...D%20manual.pdf

Motor Frequency Multiplier Selection (J6) ? Jumper
J6 is factory set to the ?1X? position, for motor frequency
corresponding to the frequency setting of Jumper J5 (50
or 60 Hz). To double the output frequency to the motor,
set Jumper J6 to the ?2X? position (100 or 120 Hz). See
Figure 14.
Note: When doubling the motor frequency, the motor
will produce full torque up to its rated speed. The torque
will be linearly reduced to 50% at the maximum doubled
frequency.

Am I right?


wrote:

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

The manual that you posted shows that the carrier frequency
for your.VFD is fixed at 16KHz with no facility for adjustment.
This is right at the very top of the range of commonly provided
carrier frequencies (about 2 to 16Khz). Since this is well above
audible frequency and corresponds to minimum noise this is
unlikely to be the cause of your high noise level.

The double motor frequency setting is a useful one
which enables motor operation well beyond its nameplate speed.
Since the carrier frequency is unaltered, will have little effect
on noise level.

Not very helpful I'm afraid - a call to the
manufacturer may help!

Jim