On 15 May 2015, at 10:03, andy pugh wrote:
On 15 May 2015 at 02:02, Tom Easterday tom-...@bgp.nu wrote:
I don’t have extra wire to do them individually and my wire is a
multi-conductor (3 + ground). So I am going to put 4 ferrites together over
the whole cable (including ground)
You
On 15 May 2015 at 02:02, Tom Easterday tom-...@bgp.nu wrote:
I don’t have extra wire to do them individually and my wire is a
multi-conductor (3 + ground). So I am going to put 4 ferrites together over
the whole cable (including ground)
You can just take the same 4-core wire 3x through the
On Friday 15 May 2015 05:43:14 Marcus Bowman wrote:
On 15 May 2015, at 10:03, andy pugh wrote:
On 15 May 2015 at 02:02, Tom Easterday tom-...@bgp.nu wrote:
I don’t have extra wire to do them individually and my wire is a
multi-conductor (3 + ground). So I am going to put 4 ferrites
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
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. ;-)
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
On 05/14/2015 07:53 AM, Tom Easterday wrote:
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.
Yes, I had
On 05/14/2015 09:38 AM, Rick Lair wrote:
I have been following this thread somewhat, and have a question,
What is the difference between a line reactor and emi input filter?
A line reactor may be designed to reduce the 3rd harmonic
produced by typical rectifier/capacitor 3-phase loads, and
I guess a common mode filter will be good but I have almost only theoretical
knowledge and very limited experience.
Nicklas Karlsson
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
: 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
I forgot to mention. There is a capacitance between motor cables and protective
earth. Then the motor is driven by the VFD it is supplied with square wave
voltages at high frequency and at each switching the capacitance is discharged
or charged. As impedance at high frequency is far from zero
On 5/14/2015 6:53 AM, Tom Easterday wrote:
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
On May 14, 2015, at 4:15 PM, Peter C. Wallace p...@mesanet.com wrote:
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
I don’t think the rule intends that you must react to it, or re-send it! They
may have taken it a bit too far ;-)
-Tom
On May 14, 2015, at 7:51 PM, Gregg Eshelman g_ala...@yahoo.com wrote:
On 5/14/2015 6:53 AM, Tom Easterday wrote:
However, I did find the source of the main problem! It
I forgot to mention. Automation Direct does allow returns up to 30
days after the purchase, so if you try out the filter and it doesn't
work..
Dave
On 5/12/2015 9:20 AM, Tom Easterday wrote:
Thanks everyone for the great ideas. I have a much fix now. I will let you
know what I find.
I was getting similar symptoms - random stuff happening in Axis, windows
popping up, etc. - and it turned out it was just a cheap usb keyboard that
started malfunctioning and sending out random keystrokes. I replaced the
keyboard and everything is fine...
- Claude
On Wed, May 13, 2015 at 6:54
Controller (EMC) emc-users@lists.sourceforge.net
Sent: Wednesday, May 13, 2015 11:19:21 AM
Subject: Re: [Emc-users] If there's one thing I hate, all the noise, noise,
noise, noise
I was getting similar symptoms - random stuff happening in Axis, windows
popping up, etc. - and it turned out
Grounding. Power ground must be separated from small signal ground.
The VFD also generate a common mode voltage and unless a common mode inductor
is added to increase common mode impedance there will be a high frequency
current flowing thru the protected earth wire which in combination with the
I'm not the strongest electrically, but when I've run into noise issues, it
was either we did something obvious and we were able to fix it (like in the
non-grounded lathe example from Marius Liebenberg) or we never found the
problem. We put on all kinds of ferrite torrids and inline filters and
One more thing... I'd put the cover on that M350 computer chassis.
That will help keep RF out of the computer.
Dave
On 5/11/2015 9:00 PM, Tom Easterday wrote:
Early on we made a decision to put our VFD into the same cabinet as the rest
of the electronics on a lathe retrofit - I originally
On 11.05.15 23:14, Tom Easterday wrote:
I will do that tomorrow. I wonder if using this tape to shield
unshielded wire, like my VFD to motor cable, would work….?
On 12 May 2015 at 02:00, Tom Easterday tom-...@bgp.nu wrote:
I am wondering if anyone has any ideas of where i can look, or what I can do?
I had a similar (but much less serious) problem and one of the things
I did was to take the outgoing motor cables through a common-mode
choke. (ie all three
Thanks everyone for the great ideas. I have a much fix now. I will let you
know what I find.
-Tom
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I have had very good luck with drive input filters sold by Automation
Direct.On the box it says Delta Electronics Model 20DRT1W3S.
Here it is.
Early on we made a decision to put our VFD into the same cabinet as the rest of
the electronics on a lathe retrofit - I originally had two separate cabinets,
one for power with vfd and one for electronics. This was to save space and
bring the size of the cabinet on the machine down to a more
I'm sorry to hear that the Rasmi filter didn't help your noise
problems. I bought four of them, and I've installed the first one but
am 1-3 days away from finally installing that electrical panel and
testing the electronics.
Without the Rasmi filter, my CNC router has some noise on the VGA
On 05/11/2015 06:00 PM, Tom Easterday wrote:
Early on we made a decision to put our VFD into the same cabinet as the rest
of the electronics on a lathe retrofit - I originally had two separate
cabinets, one for power with vfd and one for electronics. This was to save
space and bring the
On May 11, 2015, at 10:49 PM, Gregg Eshelman g_ala...@yahoo.com wrote:
Another thing, put the outer case back on the computer you have mounted
to the door, or cover the large open holes with solid sheet metal or
screen. That's as much to keep noise generated by the computer in as it
is
Tom,
Hard to tell from the picture but I would make sure that ground is
properly connected in star configuration, i.e. there is only one
ground point [1] in the cabinet and the CNC machine. I suspect you get
some ground currents somewhere which possibly cause enough noise to mess
up your VFD.
Either move the VFD to its own enclosure or isolate it with sheet metal
and metal screening, grounded to the enclosure. That will block RFI/EMI
radiating directly from the VFD.
---
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Thanks for all the info Bruce! I suspect you are right that it is radiated
noise. I should probably start with the outbound motor wire from the VFD. It
is about 5 ft. long and not shielded. There are also a couple other cables I
can shield as well that current aren’t.
-Tom
On May 11,
Replacing the unshielded spindle motor cable with a shielded cable and
grounding the shield in the electrical panel is probably going to yield
the maximum bang for the buck.
Your DIN rail mounted ground terminals in the bottom of your panel are a
good single point ground for a star configured
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