Re: [Emc-users] Grounding

I think we should also be more clear on our nomenclature. We have DC GROUND which can be as simple as 3.3V or +5V and ground. We can have 24V and 12V relays and valves that also have a DC ground. And we have Stepper/Servo motors with high voltages from 24V to 300VDC. The high voltage ground

Re: [Emc-users] Grounding

By code you only have the Earth ground the parts that are used to enclose the high voltage electronics. So handles and carrages are not grounded. The motor case would be if the motor used high voltage. But in the case of a small CNC mill or lathe like what I have the motors are running off 36

Re: [Emc-users] Grounding

ystems.com] Sent: July-14-18 8:57 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Grounding On 07/14/2018 02:37 AM, Gene Heskett wrote: Not exactly 100% correct John. High frequencies are generally carried only by current flow at the skin of a conductor. And the large con

Re: [Emc-users] Grounding

On 16 July 2018 at 19:24, Chris Albertson wrote: > Those grounds are best thought of as part of the mechanical enclosure. > Those safety grounds do nothing at all until one day there is a fire and > some insulation melts One of my machines was a lot like a lathe, with a cast iron bed. Bolted to

Re: [Emc-users] Grounding

The safety grounds like that, those wires bolted to cover plates, Are important if there is mains power inside the device.But they do nothing with regards to the operation of the device or noise on the data lines. Those grounds are best thought of as part of the mechanical enclosure. Those

Re: [Emc-users] Grounding

This is the problem: Many industrial devices powered by 24 volts DC; PLCs computers, etc have specifications which limit the number of volts which DC Negative,"M" common, can be away from frame ground.   If you don't tie the 0V terminal on the DC power supply to frame ground, you have no idea

Re: [Emc-users] Grounding

On 7/13/2018 12:05 PM, andy pugh wrote: On 13 July 2018 at 16:52, Dave Cole wrote: That's pretty much standard these days. I'm not making this stuff up. That's how its done. I think that there is still some confusion out there. I used to work for a company making specialist test equipment

Re: [Emc-users] Grounding

Yes the effect is 100% symmetric. It works the same for receive and transmitted noise On Sat, Jul 14, 2018 at 3:49 PM John Dammeyer wrote: > I believe twisted cables are more immune to externally induced > interference. > The twists result in the noise canceled out at the receiving ends. >

Re: [Emc-users] Grounding

What follows is a long story about how the ground in a DC system moves around. This isn't the first time I've run into an issue on DC bus power systems. Almost 10 years ago I was responsible for the electronics design and software for this project. http://www.autoartisans.com/rings/Barge1a.jpg

Re: [Emc-users] Grounding

I believe twisted cables are more immune to externally induced interference. The twists result in the noise canceled out at the receiving ends. John > > Yes of course this is true. But it is true if the wires are twisted 1, 4 > or 16 times per inch. Why does twist help? > > OK I just

Re: [Emc-users] Grounding

is generally the best approach. John > -Original Message- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: July-14-18 12:16 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Grounding > > From a safety point of view. It is best to fo

Re: [Emc-users] Grounding

On Sat, Jul 14, 2018 at 1:14 PM Gene Heskett wrote: > > Nope, and any current flowing out is matched by a current coming back, > and when they add at a distance, they are essentially canceling because > one matches the other but has an opposite sign. > Yes of course this is true. But it is

Re: [Emc-users] Grounding

On Saturday 14 July 2018 14:40:24 Chris Albertson wrote: > On Sat, Jul 14, 2018 at 10:26 AM Gene Heskett wrote: > > On Saturday 14 July 2018 11:57:10 Jon Elson wrote: > > > > Preferably as a twisted pair so the radiation of noise largely > > cancels at 2x the twist rate distance or more. A

Re: [Emc-users] Grounding

things. But those are all usually in a sealed metal cabinet.A system > where the various devices are placed around the equipment, not all in a box > is different. > > John > > > > > -Original Message- > > From: Jon Elson [mailto:el...@pico-systems.com] >

Re: [Emc-users] Grounding

On Sat, Jul 14, 2018 at 10:26 AM Gene Heskett wrote: > On Saturday 14 July 2018 11:57:10 Jon Elson wrote: > > Preferably as a twisted pair so the radiation of noise largely cancels at > 2x the twist rate distance or more. A tight twist = less radiated noise. > No doubt twisting helps, but I

Re: [Emc-users] Grounding

the equipment, not all in a box is different. John > -Original Message- > From: Jon Elson [mailto:el...@pico-systems.com] > Sent: July-14-18 8:57 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Grounding > > On 07/14/2018 02:37 A

Re: [Emc-users] Grounding

On Saturday 14 July 2018 11:57:10 Jon Elson wrote: > On 07/14/2018 02:37 AM, Gene Heskett wrote: > > Not exactly 100% correct John. High frequencies are > > generally carried only by current flow at the skin of a > > conductor. And the large conductor, while having some rise > > in impedance, is

Re: [Emc-users] Grounding

On 07/14/2018 02:37 AM, Gene Heskett wrote: Not exactly 100% correct John. High frequencies are generally carried only by current flow at the skin of a conductor. And the large conductor, while having some rise in impedance, is still the better conductor because the smaller wire has far less

Re: [Emc-users] Grounding

On Saturday 14 July 2018 03:13:49 John Dammeyer wrote: > > > > That's pretty much standard these days. > > > > > > I don't understand the desire to connect two lines together > > > because they 'seem' to be of the same magnitude. 0VDC is Not > > > equal to Gnd Many systems will have multiple 5V

Re: [Emc-users] Grounding

On Saturday 14 July 2018 01:22:12 Chris Albertson wrote: > On Fri, Jul 13, 2018 at 9:25 AM Roland Jollivet > > > wrote: > > > That's pretty much standard these days. > > > > I don't understand the desire to connect two lines together because > > they 'seem' to be of the same magnitude. 0VDC is

Re: [Emc-users] Grounding

> > > That's pretty much standard these days. > > > > I don't understand the desire to connect two lines together because they > > 'seem' to be of the same magnitude. 0VDC is Not equal to Gnd > > Many systems will have multiple 5V power lines, heavy, light, designated. > > Do you want to link

Re: [Emc-users] Grounding

On Fri, Jul 13, 2018 at 9:25 AM Roland Jollivet wrote: > > That's pretty much standard these days. > > I don't understand the desire to connect two lines together because they > 'seem' to be of the same magnitude. 0VDC is Not equal to Gnd > Many systems will have multiple 5V power lines,

Re: [Emc-users] Grounding

On 13 July 2018 at 16:52, Dave Cole wrote: > That's pretty much standard these days. > > I'm not making this stuff up. That's how its done. I think that there is still some confusion out there. I used to work for a company making specialist test equipment (brake dynos, motor / pump testers,

Re: [Emc-users] Grounding

Each panel has its own star grounding setup, then panels are bonded between each other with a heavy cable. That's pretty much standard these days. I'm not making this stuff up.   That's how its done. When we are talking about "modules", I am talking about industrial steel control panels. 

Re: [Emc-users] Grounding

raises. We haven't even discussed the electrical noise issues coupled through the lowest impedance path. John -Original Message- From: Dave Cole [mailto:linuxcncro...@gmail.com] Sent: July-12-18 2:57 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Grounding I think you

Re: [Emc-users] Grounding

On 07/12/2018 02:12 PM, John Dammeyer wrote: Is it standard practice to connect the DC Servo and DC Instrumentation Bus to the machine frame ground which is connected to power line earth? Or is it more normal practice to keep the DC isolated from the 'earth' ground. The "DC Link" in a

Re: [Emc-users] Grounding

On Friday 13 July 2018 01:48:57 Erik Christiansen wrote: > On 12.07.18 15:33, John Dammeyer wrote: > > So what happens when the equipment with the 24V supply is 30m long > > in multiple steel frames? There would be a bonding wire from frame > > to frame since you wouldn't want to bond one end to

Re: [Emc-users] Grounding

On 12.07.18 15:33, John Dammeyer wrote: > So what happens when the equipment with the 24V supply is 30m long in > multiple steel frames? There would be a bonding wire from frame to > frame since you wouldn't want to bond one end to one AC ground outlet > and the other end to a different AC ground

Re: [Emc-users] Grounding

--Original Message- From: Gene Heskett [mailto:ghesk...@shentel.net] Sent: July-12-18 1:16 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Grounding On Thursday 12 July 2018 15:12:40 John Dammeyer wrote: Is it standard practice to connect the DC Servo and DC Instrumentation Bus

Re: [Emc-users] Grounding

On Thursday 12 July 2018 17:31:17 andy pugh wrote: > On 12 July 2018 at 20:12, John Dammeyer wrote: > > Is it standard practice to connect the DC Servo and DC > > Instrumentation Bus to the machine frame ground which is connected > > to power line earth? Or is it more normal practice to keep

Re: [Emc-users] Grounding

coupled through the lowest impedance path. John > -Original Message- > From: Dave Cole [mailto:linuxcncro...@gmail.com] > Sent: July-12-18 2:57 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Grounding > > I think you need to define what y

Re: [Emc-users] Grounding

Agreed, I have never seen a high voltage DC drive bus leg connected to ground.  That could cause all kinds of problems! Dave On 7/12/2018 5:31 PM, andy pugh wrote: On 12 July 2018 at 20:12, John Dammeyer wrote: Is it standard practice to connect the DC Servo and DC Instrumentation Bus to

Re: [Emc-users] Grounding

-Original Message- From: Gene Heskett [mailto:ghesk...@shentel.net] Sent: July-12-18 1:16 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Grounding On Thursday 12 July 2018 15:12:40 John Dammeyer wrote: Is it standard practice to connect the DC Servo and DC Instru

Re: [Emc-users] Grounding

On 12 July 2018 at 20:12, John Dammeyer wrote: > Is it standard practice to connect the DC Servo and DC Instrumentation Bus > to the machine frame ground which is connected to power line earth? Or is > it more normal practice to keep the DC isolated from the 'earth' ground. I think it might be

Re: [Emc-users] Grounding

-Original Message- > From: Dave Cole [mailto:linuxcncro...@gmail.com] > Sent: July-12-18 1:26 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Grounding > > Normally, a single ground point is established in the cabinet and all of > the grounds tie to t

Re: [Emc-users] Grounding

ne Heskett [mailto:ghesk...@shentel.net] > Sent: July-12-18 1:16 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Grounding > > On Thursday 12 July 2018 15:12:40 John Dammeyer wrote: > > > Is it standard practice to connect the DC Servo and DC Instrument

Re: [Emc-users] Grounding

Normally, a single ground point is established in the cabinet and all of the grounds tie to that one point. The same point is also tied power line ground. The multi hole bus bars they sell for use in a AC power breaker boxes work well for this. Every big box home store will have a selection

Re: [Emc-users] Grounding

On Thursday 12 July 2018 15:12:40 John Dammeyer wrote: > Is it standard practice to connect the DC Servo and DC Instrumentation > Bus to the machine frame ground which is connected to power line > earth? Or is it more normal practice to keep the DC isolated from the > 'earth' ground. > > John

Re: [Emc-users] Grounding Issues

Just looking through my supplies and I find a Hevi-Duty 240v -120v 0.95KVA transformer... gotta make room for it in the VFD cabinet and get rid if the 120v plug in. JT On 12/25/2015 10:51 AM, Ed wrote: > On 12/25/2015 04:59 AM, John Thornton wrote: >> Dave, the AD filter came in yesterday and

Re: [Emc-users] Grounding Issues

I run my pc and monitor off the 240. Almost all are universal input nowadays (some pcs require a switch) and have isolated supplies. On Dec 25, 2015 12:18 PM, "Ed" wrote: > On my CHNC I have a 500VA control transformer to drop 240V to 120V for > the computer and the monitor. That

Re: [Emc-users] Grounding Issues

I just realized that putting the control transformer in and I would not need to pull a neutral for my 120v side! Now to get off $40 for fuses for the dang thing. JT On 12/25/2015 12:45 PM, John Thornton wrote: > Just looking through my supplies and I find a Hevi-Duty 240v -120v > 0.95KVA

Re: [Emc-users] Grounding Issues

On 12/25/2015 5:59 AM, John Thornton wrote: > I wonder if I should put that filter at the beginning of the AC > circuit or just ahead of the bridge rectifier? I think I would put it prior to the transformer that feeds the bridge rectifier, if that makes sense. That AD VFDs tend to broadcast

Re: [Emc-users] Grounding Issues

The bridge rectifier is connected to 120v so no transformer is there... not sure how it gets 190vdc out of 120vac but it does. Now to find some fuses for it... may be Tuesday before I can use that. JT On 12/25/2015 12:34 PM, Dave Cole wrote: > On 12/25/2015 5:59 AM, John Thornton wrote: >> I

Re: [Emc-users] Grounding Issues

On 12/25/2015 04:59 AM, John Thornton wrote: > Dave, the AD filter came in yesterday and I'm fitting it to the machine > now. I had to relocate the VFD to the side of the cabinet due to the > additional height. I also ordered a smaller filter for the DC power > supply. I wonder if I should put

Re: [Emc-users] Grounding Issues

Dave, the AD filter came in yesterday and I'm fitting it to the machine now. I had to relocate the VFD to the side of the cabinet due to the additional height. I also ordered a smaller filter for the DC power supply. I wonder if I should put that filter at the beginning of the AC circuit or

Re: [Emc-users] Grounding Issues

On 12/25/2015 11:25 PM, John Thornton wrote: > There is no transformer in there... Ah, sorry about that... The second variable should then be considered, mains tolerance. The usual tolerance of the mains line is between +20% and -30%. If that seems large, it is. If you ask the company what you

Re: [Emc-users] Grounding Issues

On 12/25/2015 12:59 PM, John Thornton wrote: > I just realized that putting the control transformer in and I would not > need to pull a neutral for my 120v side! Now to get off $40 for fuses > for the dang thing. > > JT > That is the main reason in industry, fewer wires and mains isolation. I cut

Re: [Emc-users] Grounding Issues

On Friday 25 December 2015 13:48:52 John Thornton wrote: > The bridge rectifier is connected to 120v so no transformer is > there... not sure how it gets 190vdc out of 120vac but it does. Now to > find some fuses for it... may be Tuesday before I can use that. > > JT That is a puzzle John, the

Re: [Emc-users] Grounding Issues

There is no transformer in there... On 12/25/2015 4:19 PM, Bertho Stultiens wrote: > On 12/25/2015 11:05 PM, Gene Heskett wrote: >>> The bridge rectifier is connected to 120v so no transformer is >>> there... not sure how it gets 190vdc out of 120vac but it does. Now to >>> find some fuses for

Re: [Emc-users] Grounding Issues

troller (EMC) > Subject: Re: [Emc-users] Grounding Issues > > > The bridge rectifier is connected to 120v so no transformer is there... > not sure how it gets 190vdc out of 120vac but it does. Now to find some > fuses for it... may be Tuesday before I can use that. > >

Re: [Emc-users] Grounding Issues

I have my own personal pad mounted transformer, all underground wire back in the woods. My memory might be wrong about the voltage... can't check it now because I can't get the 5i25 to come on line. JT On 12/25/2015 4:48 PM, Bertho Stultiens wrote: > On 12/25/2015 11:25 PM, John Thornton

Re: [Emc-users] Grounding Issues

On Friday 25 December 2015 13:59:32 John Thornton wrote: > I just realized that putting the control transformer in and I would > not need to pull a neutral for my 120v side! Now to get off $40 for > fuses for the dang thing. > > JT Correct, you can use either side as neutral, or even, if it has

Re: [Emc-users] Grounding Issues

On 12/25/2015 11:05 PM, Gene Heskett wrote: >> The bridge rectifier is connected to 120v so no transformer is >> there... not sure how it gets 190vdc out of 120vac but it does. Now to >> find some fuses for it... may be Tuesday before I can use that. > That is a puzzle John, the best DC I can get

Re: [Emc-users] Grounding Issues

John, Do you have an AC filter on the power lines feeding the GS2 drive? If not, go to Automation Direct and buy the filter they specify for that drive. You will not regret the purchase. Don't buy a cheap filter. The ones that AD has now are good filters. I've had similar issues. Dave

Re: [Emc-users] Grounding Issues

Those carbon fiber sections must have a conductive layer added, for lightning protection. The Dreamliner uses a combination of wire meshes, and metal foils for grounding it's carbon fiber sections. On 12/20/2015 08:50 PM, R.L. Wurdack wrote: > Some of them tubes are Carbon fiber composite

Re: [Emc-users] Grounding Issues

On 12/21/2015 02:48 PM, andy pugh wrote: >> Where did you get the filter from? > search eBay for "Rasmi filter" and find one with the right number of > phases and current rating for your system. > > The suggestion from Bertho sounded to be worth a try too. Yes, to expand slightly with all the

Re: [Emc-users] Grounding Issues

On 21 December 2015 at 13:15, John Thornton wrote: > Where did you get the filter from? search eBay for "Rasmi filter" and find one with the right number of phases and current rating for your system. The suggestion from Bertho sounded to be worth a try too. -- atp If you

Re: [Emc-users] Grounding Issues

On 21 December 2015 at 14:26, Bertho Stultiens wrote: > > The "wisdom" people said in that case was: "put the plug in reversed". Not possible with the infinitely superior[1] BS 1363 plugs and sockets. [1] Apart from being very large, very ugly, and really bad to stand on in

Re: [Emc-users] Grounding Issues

On 12/21/2015 03:34 PM, andy pugh wrote: >> The "wisdom" people said in that case was: "put the plug in reversed". > Not possible with the infinitely superior[1] BS 1363 plugs and sockets. Agreed. However, how many people have been able to connect the wires wrong? (not counting the sealed

Re: [Emc-users] Grounding Issues

After sleeping on this for a bit my question is if I change the 220v to two hots and a neutral then string a ground wire across the floor (for testing) and wire the left cabinet to split out one phase and a neutral to run the 120v part do you think this would be worth the effort to try out?

Re: [Emc-users] Grounding Issues

By robust, what do you mean? JT On 12/20/2015 6:44 PM, John Dammeyer wrote: > John, > I'd still take a close look at your existing system to see if it is robust. > > -- ___

Re: [Emc-users] Grounding Issues

Kirk, Where did you get the filter from? JT On 12/20/2015 11:44 AM, Kirk Wallace wrote: > On 12/20/2015 05:20 AM, John Thornton wrote: >> I have a BP knee mill with an Anilam 1100M CNC kit on it. I've removed >> all the Anilam controls a while back. I've retained the drives and power >> supply

Re: [Emc-users] Grounding Issues

Another update, Automation Direct has an EMI input filter designed for that drive that mounts under it so that is on order as well as a ferrite bracelet... Peter said it was a bracelet not a bead. At least knowing it's the VFD and not an unknown issue is a big relief for me. In any case I have

Re: [Emc-users] Grounding Issues

The addition of the VFD might just put an system that is on the edge of being unstable over the edge. John Dammeyer > -Original Message- > From: John Thornton [mailto:j...@gnipsel.com] > Sent: December-21-15 3:15 AM > To: Enhanced Machine Controller (EMC) > Subject:

Re: [Emc-users] Grounding Issues

On 21 December 2015 at 14:49, Bertho Stultiens wrote: [BS1363 Plugs] >> [1] Apart from being very large, very ugly, and really bad to stand on >> in bare feet. > > Well, large, yes; ugly, yes; but bare feet? They seem well designed lie on the ground with the pins poking

Re: [Emc-users] Grounding Issues

e edge. > John Dammeyer > > >> -Original Message- >> From: John Thornton [mailto:j...@gnipsel.com] >> Sent: December-21-15 3:15 AM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Grounding Issues >> >> >> By robus

Re: [Emc-users] Grounding Issues

On 12/20/2015 4:06 PM, John Thornton wrote: > Well it works fine till I plug in the VFD so I guess I'll have to rewire > the machine and my shop again :( VFD output directly to motor and adequate noise filtering upstream of the VFD? --- This email has been checked for viruses by Avast

Re: [Emc-users] Grounding Issues

On 12/20/2015 05:06 PM, John Thornton wrote: > Well it works fine till I plug in the VFD so I guess I'll have to rewire > the machine and my shop again :( > > Well, that is now very important information! Just plugging in the VFD, without having it start the spindle motor causes the problem?

Re: [Emc-users] Grounding Issues

lained earlier. Then start looking at how the noisy > signals might find their way back through alternate paths. Filters, > Ferrites are all useful to block the signals. Always best to block at the > source. > > John > > > > > > >> -Original Message-

Re: [Emc-users] Grounding Issues

Peter, this is the root cause in the change of behavior between <=2.6 and 2.7 w/ the 5i25+7i77 that a couple of us have been having (was discussed here about a week ago)? I have noticed an occasional warning in the prior version I was running (just at startup iirc.) I need to put some more noise

Re: [Emc-users] Grounding Issues

cember-20-15 6:59 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Grounding Issues > > > Peter, this is the root cause in the change of behavior between <=2.6 and > 2.7 w/ the 5i25+7i77 that a couple of us have been having (was discussed > here a

Re: [Emc-users] Grounding Issues

I hope the procedure goes well. Yes I have a scope. JT On 12/20/2015 1:23 PM, Gene Heskett wrote: > But I am shortly going to be out of pocket till Monday afternoon. > Cataract fixings in the XYL's right eye are scheduled for first thing > in the morning, so we've reserved a room about a

Re: [Emc-users] Grounding Issues

An update, I made a star grounding configuration so EVERY ground comes from the same place. I tested with the VFD unplugged and all is fine, plug the VFD in and same problem sserial errors. The VFD is 220v so to use one power source I'd have to run new wire from the panel to the 220v outlet

Re: [Emc-users] Grounding Issues

John You're welcome. My _Go_To_ book is "Electromagnetic Compatibility Engineering" By Henry W.Ott. Published by WILEY. http://ca.wiley.com/WileyCDA/WileyTitle/productCd-0470189304.html I've retained perhaps 5% and for a while the book went everywhere with me as I tried to absorb the details.

Re: [Emc-users] Grounding Issues

Well it works fine till I plug in the VFD so I guess I'll have to rewire the machine and my shop again :( JT On 12/20/2015 2:25 PM, John Dammeyer wrote: > Hi John, > > It sounds as if you have two AC lines coming into the machine. One for the > controller and one for the VFD. The comments

Re: [Emc-users] Grounding Issues

if you can get a scope (2 trace) and _SEE_ the noise from your machine ground to a good ground, then you can see when you make a difference. a good ground can be tested with a megger ( hard to find) a good ground can be a copper rod driven 10 ft into good earth so find the best you can and look

Re: [Emc-users] Grounding Issues

that leaves from one location ends up back there since current only flows when there's a complete circuit. John > -Original Message- > From: TJoseph Powderly [mailto:tjt...@gmail.com] > Sent: December-20-15 4:17 PM > To: Enhanced Machine Controller (EMC) > Subject:

Re: [Emc-users] Grounding Issues

5 3:06 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Grounding Issues > > > Well it works fine till I plug in the VFD so I guess I'll have to rewire > the machine and my shop again :( > > JT > > On 12/20/2015 2:25 PM, John Dammeyer wrote: &

Re: [Emc-users] Grounding Issues

On 12/21/2015 12:59 AM, John Thornton wrote: > An update, I made a star grounding configuration so EVERY ground comes > from the same place. I tested with the VFD unplugged and all is fine, > plug the VFD in and same problem sserial errors. The VFD is 220v so to > use one power source I'd have

Re: [Emc-users] Grounding Issues

eph Powderly [mailto:tjt...@gmail.com] >> Sent: December-20-15 4:17 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Grounding Issues >> >> >> if you can get a scope (2 trace) >> and _SEE_ the noise >> from your machine ground to a

Re: [Emc-users] Grounding Issues

er (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Grounding Issues > > Peter, this is the root cause in the change of behavior between <=2.6 and > 2.7 w/ the 5i25+7i77 that a couple of us have been having (was discussed > here about a week ago)? I

Re: [Emc-users] Grounding Issues

There was a thread back in May (11-15) of 2015 Subject was "If there's one thing I hate, all the noise, noise, noise, noise” where I was having strange noise issues. There are a lot of helpful suggestions there for tracking down noise. In my case the problem was an overly sensitive keyboard,

Re: [Emc-users] Grounding Issues

I have a line reactor for the VFD but I've never hooked it up. http://www.automationdirect.com/adc/Shopping/Catalog/Drives/AC_Drive_%28VFD%29_Spare_Parts_-a-_Accessories/AC_Line_Reactors/LR-23P0-1PH Speaking of VFD's mine is grounded to the breaker panel and not in the machine anywhere. When I

Re: [Emc-users] Grounding Issues

The bpel04 has a star washer and the stud is welded to the back plane. The cases are bolted tight to the main column. The DIN rail is fastened down with star washers and the locking screws are tight. JT On 12/20/2015 11:42 AM, Dave Caroline wrote: > The din rail in the 05 pic is that real

Re: [Emc-users] Grounding Issues

ot; <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Grounding Issues > > I have a line reactor for the VFD but I've never hooked it up. > > http://www.automationdirect.com/adc/Shopping/Catalog/Drives/AC_Drive_%28VFD%29_Spare_Parts_-a-_Accessories/AC_Line_Reacto

Re: [Emc-users] Grounding Issues

On 12/20/2015 11:47 AM, Gene Heskett wrote: > On Sunday 20 December 2015 12:15:21 John Thornton wrote: > >> Back from shopping... >> >> Pencil sketch of the power side >> http://gnipsel.com/images/bp-knee-mill/bpel03.in > the left box probably needs the paint cleaned off under it, and maybe a >

Re: [Emc-users] Grounding Issues

On Sunday 20 December 2015 08:20:38 John Thornton wrote: > I have a BP knee mill with an Anilam 1100M CNC kit on it. I've removed > all the Anilam controls a while back. I've retained the drives and > power supply and added a GS2 VFD for the spindle. I have a 5i25 7i77 > setup. From the get go

Re: [Emc-users] Grounding Issues

Ok, I'll work on that this morning. Thanks JT On 12/20/2015 7:57 AM, Dave Caroline wrote: > It might help to draw a diagram showing the electronics (drives > modules etc) and where they are grounded showing outlines of the > cases. > > This is to get an idea where any common mode interference

Re: [Emc-users] Grounding Issues

I'll start with a couple of photos of the el cabinets before breakfast and get more details after. http://gnipsel.com/images/bp-knee-mill/bpel01.jpg http://gnipsel.com/images/bp-knee-mill/bpel02.jpg JT On 12/20/2015 7:57 AM, Dave Caroline wrote: > It might help to draw a diagram showing the

Re: [Emc-users] Grounding Issues

John Some things to look for. 1: Make sure that you field supply is not grounded to the same ground as the VFD. I.E the 24v Filed supply must be floating. 2: All cables must be screened where possible. 3: Screen must only be connected at the source and and to one single place to the physical

Re: [Emc-users] Grounding Issues

On 12/20/2015 8:37 AM, Gene Heskett wrote: > Start with a roll of flat braid equ to a 8 or 10 gauge wire. Establish a > bolt to the case of the controller as a master ground, and make sure > everything that references ground in the controller box is grounded at > this bolt. > > Tie this bolt to

Re: [Emc-users] Grounding Issues

It might help to draw a diagram showing the electronics (drives modules etc) and where they are grounded showing outlines of the cases. This is to get an idea where any common mode interference signals can come from. Also pictures of the wiring with annotation of wire bundles to get an idea of

Re: [Emc-users] Grounding Issues

Back from shopping... Pencil sketch of the power side http://gnipsel.com/images/bp-knee-mill/bpel03.jpg Incoming terminal block on left panel where extra ground is http://gnipsel.com/images/bp-knee-mill/bpel04.jpg next terminal block on right panel

Re: [Emc-users] Grounding Issues

On 12/20/2015 05:20 AM, John Thornton wrote: > I have a BP knee mill with an Anilam 1100M CNC kit on it. I've removed > all the Anilam controls a while back. I've retained the drives and power > supply and added a GS2 VFD for the spindle. I have a 5i25 7i77 setup. > From the get go I've had

Re: [Emc-users] Grounding Issues

The din rail in the 05 pic is that real tight to the back panel (add star washers to cut through paint), make sure the green/yellow blocks have the middle screw tight. One mighty thin grounding wire in bpel04.jpg, also could add star washer to cut through paint You could measure the ground

Re: [Emc-users] Grounding Issues

On Sunday 20 December 2015 12:15:21 John Thornton wrote: > Back from shopping... > > Pencil sketch of the power side > http://gnipsel.com/images/bp-knee-mill/bpel03.in the left box probably needs the paint cleaned off under it, and maybe a star washer under the spade lug for extra connection

Re: [Emc-users] Grounding Issues

On Sunday 20 December 2015 13:37:38 John Thornton wrote: > On 12/20/2015 11:47 AM, Gene Heskett wrote: > > On Sunday 20 December 2015 12:15:21 John Thornton wrote: > >> Back from shopping... > >> > >> Pencil sketch of the power side > >> http://gnipsel.com/images/bp-knee-mill/bpel03.in > > > >

Re: [Emc-users] Grounding Issues

ock the signals. Always best to block at the source. John > -Original Message- > From: John Thornton [mailto:j...@gnipsel.com] > Sent: December-20-15 10:27 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Grounding Issues > > > I have

Re: [Emc-users] Grounding Issues

I bought some Weidmuller WPE6 off ebay for less than $1/ea. In fact, I bought various DIN terminal blocks off ebay for a fraction of the price new. I’d watch ebay, you may find a deal…

Re: [Emc-users] Grounding Issues

John, On 12/20/2015 06:31 AM, John Thornton wrote: > I'll start with a couple of photos of the el cabinets before breakfast > and get more details after. > > http://gnipsel.com/images/bp-knee-mill/bpel01.jpg > http://gnipsel.com/images/bp-knee-mill/bpel02.jpg > > JT > We used to have cabinet

  1   2   >