Re: [CAD_CAM_EDM_DRO] Question on VFD line rectors

washcomp wrote:

>I'm planning on adding a VFD to my Bridgeport (varying the speed
>from my CNC controller). They recommend the use of a line reactor
>on both the input and the output sides.
>
>

Line reactors on the input reduce the harmonic content sent back to the
power line. If you have line-conducted EMI affecting equipment that
is powered from the same source, the line reactor will help. I had
problems with a VFD affecting a computer-controlled air compressor
and the video monitor on my CNC system. I used a Corcom power line
filter unit, which did a every effective job. It contains more than just
a line reactor.

Inductors on the VFD output are good when the motor has very low
inductance, such as trying to run a 5 Hp motor at low power output
froma 1 HP VFD. Why did the VFD manufacturer recommend the
reactor on the output? I did need one when I connected an 80,000 RPM
spindle motor to a VFD, due to the extremely low inductance. I've
never used on one a 60 Hz machine tool motor.

>Locally, I have 208V 3 phase A.C. 60Hz.
>I have a 1.5 HP motor on my Bridgeport
>
>I came across this and was wondering if it would be the proper one
>my application:
>
>http://cgi.ebay.com/ws/eBayISAPI.dll?
>ViewItem&category=42881&item=2570523396
>
>

Well, the price is sure right, but I really don't know why you need this.

Jon