Re: [Emc-users] question on emi filters

On Thursday 19 January 2017 04:11:52 ei...@sjaavik.no wrote: > > I'm still not sure how such a horrible noise signal gets from the 48 > > volt motor armature switching circuit in the G320 to the input of > > the 7i78 but at least now I know the source and can try to fix it. > > I'm pretty sure

Re: [Emc-users] question on emi filters

> I'm still not sure how such a horrible noise signal gets from the 48 > volt motor armature switching circuit in the G320 to the input of the > 7i78 but at least now I know the source and can try to fix it. I'm > pretty sure that I can't just put a cap across the armature outputs > of the

Re: [Emc-users] question on emi filters

Nicklas, I guess I didn't describe the setup as well as I could have. The Gecko 320's are the source of the 20 khz pulses but the 320's are on the x and z axes and the noise is coming in on the spindle encoder lines. The noise is there even when the 320's are NOT active and the x and z motors

Re: [Emc-users] question on emi filters

On Sunday 15 January 2017 04:11:52 Nicklas Karlsson wrote: > > > I should probably start a new thread here but there is definitely > > > a similarity in the noise problem. > > > > > > In my jet 9 x 20 conversion I was getting lots of noise spikes on > > > my spindle encoder feedback to the 7i78

Re: [Emc-users] question on emi filters

> > I should probably start a new thread here but there is definitely a > > similarity in the noise problem. > > > > In my jet 9 x 20 conversion I was getting lots of noise spikes on my > > spindle encoder feedback to the 7i78 card. > > I went through all the regular suspects, grounding, shielding

Re: [Emc-users] question on emi filters

On 2017-01-15 00:58, Gene Heskett wrote: > So as they used to say on the radio when we wuz kids, stay tuned. :) -- "In der Wissenschaft siegt nie eine neue Theorie, nur ihre Gegner sterben nach und nach" Max Planck

Re: [Emc-users] question on emi filters

On Saturday 14 January 2017 12:00:37 Cecil Thomas wrote: > I should probably start a new thread here but there is definitely a > similarity in the noise problem. > > In my jet 9 x 20 conversion I was getting lots of noise spikes on my > spindle encoder feedback to the 7i78 card. > I went through

Re: [Emc-users] question on emi filters

On 01/14/2017 11:00 AM, Cecil Thomas wrote: > > > My noise source is the G320's PWM generator which switches at 20 khz. > > I'm still not sure how such a horrible noise signal gets from the 48 > volt motor armature switching circuit in the G320 to the input of the > 7i78 Yes, the Gecko drives have

Re: [Emc-users] question on emi filters

I should probably start a new thread here but there is definitely a similarity in the noise problem. In my jet 9 x 20 conversion I was getting lots of noise spikes on my spindle encoder feedback to the 7i78 card. I went through all the regular suspects, grounding, shielding twisted pair etc.

Re: [Emc-users] question on emi filters

On 01/09/2017 07:42 PM, Gene Heskett wrote: > Progress. Everything with power on it is now working, > which means the vfd and the encoder, the noise is gone > from the encoders velocity trace on the halscope. GREAT! > What sort of settings are those using a vfd using for > minimum speed, and

Re: [Emc-users] question on emi filters

On Saturday 07 January 2017 20:07:12 Gene Heskett wrote: > Starting the spindle of course makes the noise worse. I setup the > halscope to read, pulseA, pulseB, velocity and index. > > Triggered on the index, I had to reduce the velocity gain to about > 10,000volts per vertical division to get

Re: [Emc-users] question on emi filters

On Friday 06 January 2017 15:03:16 Gene Heskett wrote: > On Friday 06 January 2017 14:13:07 andy pugh wrote: > > On 6 January 2017 at 18:55, Gene Heskett wrote: > > > Switching back to the bare hook tip on the probe, I found about a > > > 15 volt square, with tons of

Re: [Emc-users] question on emi filters

On Friday 06 January 2017 14:13:07 andy pugh wrote: > On 6 January 2017 at 18:55, Gene Heskett wrote: > > Switching back to the bare hook tip on the probe, I found about a 15 > > volt square, with tons of ringing at about half the square parts > > amplitude, > > Have you

Re: [Emc-users] question on emi filters

On 6 January 2017 at 18:55, Gene Heskett wrote: > Switching back to the bare hook tip on the probe, I found about a 15 volt > square, with tons of ringing at about half the square parts amplitude, Have you tried simply turning things off one at a time? -- atp "A

Re: [Emc-users] question on emi filters

On Thursday 05 January 2017 13:08:54 Jon Elson wrote: > On 01/04/2017 10:07 PM, Gene Heskett wrote: > > I can't think of a thing in that whole kit that would be > > switching at 335 KHz. Except the regulator in the pi's > > power input. > > Trust nothing. LCD monitors, especially with CCFL >

Re: [Emc-users] question on emi filters

On Thursday 05 January 2017 13:08:54 Jon Elson wrote: > On 01/04/2017 10:07 PM, Gene Heskett wrote: > > I can't think of a thing in that whole kit that would be > > switching at 335 KHz. Except the regulator in the pi's > > power input. > > Trust nothing. A lesson I am expensively learning. >

Re: [Emc-users] question on emi filters

On 01/04/2017 10:07 PM, Gene Heskett wrote: > I can't think of a thing in that whole kit that would be > switching at 335 KHz. Except the regulator in the pi's > power input. Trust nothing. LCD monitors, especially with CCFL backlight, are huge noise sources. Take a small coil (solenoid type,

Re: [Emc-users] question on emi filters

On Sunday 01 January 2017 23:16:33 Gene Heskett wrote: > On Sunday 01 January 2017 19:01:29 andy pugh wrote: > > On 1 January 2017 at 23:47, Gene Heskett wrote: > > > Its radiated noise from the motor supplies. > > > > Motor supplies don't even need to be regulated. Just

Re: [Emc-users] question on emi filters

> Its radiated noise from the motor supplies. Directly related to the > switching, which is at nominally 17 Kilohertz, but the harmonics reach > to well above 100 Megahertz. Never seen anything ring that way, 10 to 30 > cycles to get down to 50% of the peak. I think you need a common mode

Re: [Emc-users] question on emi filters

On 1 January 2017 at 23:47, Gene Heskett wrote: > Its radiated noise from the motor supplies. Motor supplies don't even need to be regulated. Just use a transformer, rectifier and capacitors. (transformer might be optional, depending on hardware, both my current machines

Re: [Emc-users] question on emi filters

On 01/02/2017 12:38 AM, Gene Heskett wrote: [snip] > Bring up power to the motor supplies and its injecting enough noise on > the SPI bus that it all goes in the crapper. Once I stopped everything > but lcnc, and was walking around the tail end of it to see what I could > see on the scope, this

Re: [Emc-users] question on emi filters

On Sunday 01 January 2017 11:58:55 Peter C. Wallace wrote: > #1 are you using all 8 grounds on the flat cable to connect the 7I90 > to the RPI? > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world

Re: [Emc-users] question on emi filters

On Sunday 01 January 2017 11:51:04 andy pugh wrote: > On 1 January 2017 at 16:44, Gene Heskett wrote: > > So far, only line filters have helped. > > No improvement with the new PSU? No Andy. > > For the amount of 5V power we are talking about here, surely it would > be

Re: [Emc-users] question on emi filters

On Sunday 01 January 2017 11:29:45 Bertho Stultiens wrote: > On 01/01/2017 04:33 PM, Gene Heskett wrote: > > Well, in my case, the cable might be 8" long. The power to the pi > > and the power to the 7i90, originate from the output terminals of a > > separate 5v supply. But the pi has a ferrite

Re: [Emc-users] question on emi filters

> No improvement with the new PSU? > > For the amount of 5V power we are talking about here, surely it would > be easy to make or buy a linear PSU? Yes, TO220 7805 or LM8705 but you may be suprised about how much power is wasted as heat inside it. It is a good idea to do the math before bying.

Re: [Emc-users] question on emi filters

#1 are you using all 8 grounds on the flat cable to connect the 7I90 to the RPI? Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination.

Re: [Emc-users] question on emi filters

On 1 January 2017 at 16:44, Gene Heskett wrote: > So far, only line filters have helped. No improvement with the new PSU? For the amount of 5V power we are talking about here, surely it would be easy to make or buy a linear PSU? -- atp "A motorcycle is a bicycle with a

Re: [Emc-users] question on emi filters

users@lists.sourceforge.net> > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] question on emi filters > > > > On Sunday 01 January 2017 05:54:05 Bertho Stultiens wrote: > >> On 12/31/2016 09:18 PM, Gene Heskett wrote: > >> [snip] >

Re: [Emc-users] question on emi filters

On 01/01/2017 04:33 PM, Gene Heskett wrote: > Well, in my case, the cable might be 8" long. The power to the pi and the > power to the 7i90, originate from the output terminals of a separate 5v > supply. But the pi has a ferrite choke on its power lead that the 7i90 > lacks. The 5v supply's

Re: [Emc-users] question on emi filters

On Sun, 1 Jan 2017, Gene Heskett wrote: > Date: Sun, 1 Jan 2017 10:33:44 -0500 > From: Gene Heskett <ghesk...@shentel.net> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net >

Re: [Emc-users] question on emi filters

On Sunday 01 January 2017 05:54:05 Bertho Stultiens wrote: > On 12/31/2016 09:18 PM, Gene Heskett wrote: > [snip] > > >> However, if the reference ground is not equal at both ends of the > >> signal line, then you are in trouble. This is why you would use a > >> balanced line (differential),

Re: [Emc-users] question on emi filters

> Do you know of a 4 wire to 8 wire and back interface that can function at > 32 megabaud and doesn't cost 5 grand+? Neither do I. :) Laser diodes > and detectors that could handle 2x the video speed needed to hit an HDTV > transmitter would be required, times 4 to do it optically. > > There

Re: [Emc-users] question on emi filters

On 12/31/2016 09:18 PM, Gene Heskett wrote: [snip] >> However, if the reference ground is not equal at both ends of the >> signal line, then you are in trouble. This is why you would use a >> balanced line (differential), which is not absolutely referenced to >> ground, but switches on the

Re: [Emc-users] question on emi filters

On Saturday 31 December 2016 13:50:38 Chris Albertson wrote: > Gene, > > I think you know all this but I wonder if you implemented it. > > I wonder if the issue is not with grounding. If a signal moves > relative to ground maybe it is the ground that moves? The only way > to avoid a

Re: [Emc-users] question on emi filters

On Saturday 31 December 2016 12:16:50 Bertho Stultiens wrote: > On 12/31/2016 05:54 PM, Gene Heskett wrote: > > While I like the SPI interface as its faster that even a parport, I > > am finding it quite susceptible to mistakes cause by emi from a > > switching psu's typical of stepper motor

Re: [Emc-users] question on emi filters

On 31 Dec 2016, at 18:50, Chris Albertson wrote: > Gene, > > I think you know all this but I wonder if you implemented it. > > I wonder if the issue is not with grounding. If a signal moves > relative to ground maybe it is the ground that moves? The only way > to avoid a moving ground

Re: [Emc-users] question on emi filters

Gene, I think you know all this but I wonder if you implemented it. I wonder if the issue is not with grounding. If a signal moves relative to ground maybe it is the ground that moves? The only way to avoid a moving ground is tomato absolutely certain that it is impossible for current to

Re: [Emc-users] question on emi filters

On 12/31/2016 05:54 PM, Gene Heskett wrote: > While I like the SPI interface as its faster that even a parport, I am > finding it quite susceptible to mistakes cause by emi from a switching > psu's typical of stepper motor psu's. These things it seems can radiate > back out the line input

[Emc-users] question on emi filters

Greetings all; While I like the SPI interface as its faster that even a parport, I am finding it quite susceptible to mistakes cause by emi from a switching psu's typical of stepper motor psu's. These things it seems can radiate back out the line input connections, while switching at 17