On Wed, 11 May 2016 12:20:35 -0500, Jon Elson
wrote:

wrote:

To all youse high speed spindle guys,
I have now a new 2.2KW VFD and matching 24000 RPM spindle motor. I am
wondering how important line and load reactors are for this setup.
Especially the line reactor because the motor/VFD combo is supposed to
be matched and because the motor wires will be short, 6 feet or so.
From looking online I have determined that a reactor rated at 12 amps,
2.5 mh, and 5% impedence is optimal. Can a reactor with a larger
current rating be used? Also, since the VFD can be connected to single
phase power and I want to use that option, I think I need to use a
reactor with a higher current rating. 18 amps instead of 12, right? I
haven't seen any single phase reactors yet on ebay which is why I am
asking. On the output side I am concerned with noise making problems
for the CNC mill (a Fadal 15XT) that the spindle will be installed in.
Will a reactor help with this sitaution? Do I really need one with
such a small (2.2 KW) motor?
I'm not sure a line reactor, per se is what you need. it does help in large
installations, where dozens of large VFDs cause harmonic problems on the
mains. Do you actually HAVE a problem with line interference?

I had some problems here, mostly hash on my computer screen when the VFD was
running. The fix was to put a line filter unit on the power input to the
VFD. This contains a combination of inductors and capacitors, and is
specifically designed to eliminate interference from equipment getting out
on the mains - and vice versa. These are often installed at the power entry
of various electronic gear, large computers and things like that. I have a
few in my junk box.

Here's one : http://www.ebay.com/itm/380905940894
You might be able to find one closer.


Jon
I have as yet not powered anything up but have read about problems,
one of them being drives failing from power surges upon powering up.
Apparently a line reactor helps to prevent damage from current surges
upon powering up.
Eric