On Mon, 19 Aug 2013 18:02:08 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

Karl Townsend fired this volley in
:

Anyway, should i pop for a reactor? I've bought from automation direct
before with good results.

If the squeal is coming from the motor itself, the reactor(s) will help
smooth the 'simulated sine wave' coming out of the inverter drive.

Good VFD's divide the stepped waveform up into small enough slices so
that the noise is of a high enough frequency not to be heard by us old
men, and not annoying to anything but cats and bats and teenagers (a good
thing).

I've used the Automation Direct VFDs and also Motortronics, with which I
have had very good experience and reliability. No noise from either
brand.

Lloyd

The later Rockwells I've used had a menu item to change the carrier
frequency if noise was evident. Our vendor recommended reactors if
200' or more. Something to do with harmonics on the feed line. Mine
were usually about 10' or less. Mitsubishis I have now are quiet
except I can hear the cooling fans.

Good luck.

Pete Keillor