On Thu, 14 May 2015, Karlsson & Wang wrote:
Date: Thu, 14 May 2015 21:53:05 +0200
From: Karlsson & Wang <nicklas.karls...@karlssonwang.se>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] If there's one thing I hate, all the noise, noise,
noise, noise
I guess a common mode filter will be good but I have almost only theoretical
knowledge and very limited experience.
Nicklas Karlsson
We found that common mode filters (big ferrite bead around U,V,W) on the motor
leads help a lot. Otherwise you have ~360V square waves driving the stray
wiring and motor capacitance and _nothing_ to limit the peak current of these
fast edges driving into this capacitance to ground. This causes huge ground
bumping of the VFD ground. A common mode choke limits these peak currents
considerably (and is probably built-in in better drives)
On Thu, 14 May 2015 10:38:43 -0400
Rick Lair <r...@superiorroll.com> wrote:
I have been following this thread somewhat, and have a question,
What is the difference between a line reactor and emi input filter?
We have a AD GS3 40hp drive in our turning center, and have the same
noise problems with the drive, and I am not sure which one to buy, or do
I need both? The drive schematic shows putting an emi filter on both
sides of the drive, would that help as well? At $272 bucks a piece, I
don't want to throw money away, but I do want to get this put to bed, we
have been dealing with it for 2 years now, and I am getting tired of it.
Thanks
Rick
On 5/14/2015 9:53 AM, Dave Cole wrote:
>>> The Rasmi input filter
> Take it off and see what happens....
>
> If that drive is screwing with your keyboard that is on the OUTSIDE of your
control cabinet, imagine what kind of RF exposure is on the inside of your control
cabinet!
>
> Those AD VFDs should also be sold as EMI test generators. ;-)
>
> Dave
>
>
>
> On 5/14/2015 8:53 AM, Tom Easterday wrote:
>> I spent some time with the spectrum analyzer but did??t have much luck in
isolating the sink for the noise. I just verified that my VFD does indeed produce a
large amount of noise between low kHz and about 10MHz! I did some re-routing of
wires and replaced some that weren??t shielded. I ordered some ferrites for the
VFD-motor wiring and my computer I/O extension cabling which will be here in a couple
days.
>>
>> However, I did find the source of the main problem! It was indeed my
keyboard. Not the USB wiring from keyboard to pc, but the keyboard ITSELF is very
sensitive to the noise created by the VFD. If I move the keyboard to the very
extreme end of it??s (rather long) usb cable the problem disappears completely. 6??
closer to the cabinet and noise reappears. Apparently the noise is being interpreted
as key presses by the keyboard circuitry. I replaced the new water resistant
Logitech keyboard with a very old Apple keyboard I had lying around and no more
random characters! I also had a second problem where the VFD would shut down
somewhat randomly which I thought was related to this noise as well. That turned out
to be an over current condition at very low rpm. Tweaking some settings fixed that.
>>
>> The Rasmi input filter, and various re-wiring and shielding I did was
probably not needed, but in the long run perhaps it will save me from other problems.
>>
>> Thanks, for all the input,
>> -Tom
>>
>>
>>
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--
Thanks
Rick Lair
Superior Roll & Turning LLC
399 East Center Street
Petersburg MI, 49270
PH: 734-279-1831
FAX: 734-279-1166
www.superiorroll.com
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Mesa Electronics
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