Re: [Emc-users] Rewiring the BP Again

We had about 10" of snow on the ground before the short melt hit, making things a bit soggy. Then the temps dropped again and we got another 3 - 4 inches over the last couple of days. Hopefully, they'll have the roads cleared by the time I set out. Mark On 01/11/2016 08:14 AM, Peter Blodow

Re: [Emc-users] Rewiring the BP Again

On 01/10/2016 04:23 PM, Dave Cole wrote: > I understand.I'm working out of town and just came back for the > weekend. > > For me this is a good time to be distracted with too much work. > > It helps me ignore the wind gusts to 30 mph, the snow, and the temps > headed to 8 degrees F for

Re: [Emc-users] Rewiring the BP Again

Mark, it surely was interesting, when I drove to Traverse City last time, some 50 years ago, when I was temporarily a Michigander. Was a nice skiing weekend. Peter Am 11.01.2016 13:34, schrieb Mark: > 8 Degrees and snowing here in Grayling, MI this morning. I have to > drive over to Traverse

Re: [Emc-users] Rewiring the BP Again

On Monday 11 January 2016 08:35:59 Mark wrote: > We had about 10" of snow on the ground before the short melt hit, > making things a bit soggy. Then the temps dropped again and we got > another 3 - 4 inches over the last couple of days. Hopefully, they'll > have the roads cleared by the time I

Re: [Emc-users] Rewiring the BP

Yes, and I need to start a new thread as new info has been received. JT On 1/9/2016 7:49 PM, Dave Cole wrote: > Just saw your message. > > If you keep the VFD powered off, do you still have noise issues ?? > > Dave > > On 1/4/2016 5:19 PM, John Thornton wrote: >> I have 3 DC power supplies in

[Emc-users] Rewiring the BP Again

Well none of the suggestions about star grounding did any good. In fact they made the problem worse than before, so bad I could not even get 2.6 to run. Off this list I was sent the AB servo best wiring practices pdf which explained how to reduce noise in a servo drive enclosure. I followed

Re: [Emc-users] Rewiring the BP Again

On 01/10/2016 12:44 PM, John Thornton wrote: > Well none of the suggestions about star grounding did any good. In > fact they made the problem worse than before, so bad I could not even > get 2.6 to run. That may suggest a couple of things being wrong simultaneously: 1) you may still have loops

Re: [Emc-users] Rewiring the BP Again

Do you have filters just prior to the input power on the AB Servo drives? I've also had problems with Teco servo drives backfeeding noise into the AC line and messing with Mesa boards. An input filter from AD fixed that problem as well. Dave On 1/10/2016 6:44 AM, John Thornton wrote: > Well

Re: [Emc-users] Rewiring the BP Again

On 01/10/2016 02:48 PM, Bertho Stultiens wrote: > The sserial connection has a great potential for a loop. See attached > image for illustration. The image has a shielded connection between two > devices, which is good. However, the 0VDC connection (aka GND), which is > embedded in the shielded

Re: [Emc-users] Rewiring the BP Again

I don't have AB drives... I have a filter on my GS2 and another one after the control transformer. JT On 1/10/2016 11:40 AM, Dave Cole wrote: > Do you have filters just prior to the input power on the AB Servo drives? > > I've also had problems with Teco servo drives backfeeding noise into the

Re: [Emc-users] Rewiring the BP Again

I tried to find the original message in previous monster thread to have a better understanding of the problem but could not find it. I can't remember seeing what is connecting to VFD and few other things. I assume it's a Mesa board but which one? [1] We all seem to keep running in circles

Re: [Emc-users] Rewiring the BP Again

I understand.I'm working out of town and just came back for the weekend. For me this is a good time to be distracted with too much work. It helps me ignore the wind gusts to 30 mph, the snow, and the temps headed to 8 degrees F for tonight. Except that I need to drive a long ways in this

Re: [Emc-users] Rewiring the BP Again

My mistake, gotta clean my glasses apparently. What are you using for axes drives? Dave On 1/10/2016 3:35 PM, John Thornton wrote: > I don't have AB drives... I have a filter on my GS2 and another one > after the control transformer. > > JT > > On 1/10/2016 11:40 AM, Dave Cole wrote: >> Do you

Re: [Emc-users] Rewiring the BP Again

The original Anliam drives and power supply. JT On 1/10/2016 2:41 PM, Dave Cole wrote: > My mistake, gotta clean my glasses apparently. > > What are you using for axes drives? > > Dave > > On 1/10/2016 3:35 PM, John Thornton wrote: >> I don't have AB drives... I have a filter on my GS2 and

Re: [Emc-users] Rewiring the BP Again

Still trying to digest this in between working... On 1/10/2016 7:48 AM, Bertho Stultiens wrote: > On 01/10/2016 12:44 PM, John Thornton wrote: >> Well none of the suggestions about star grounding did any good. In >> fact they made the problem worse than before, so bad I could not even >> get 2.6

Re: [Emc-users] Rewiring the BP Again

Hmm.. perhaps you should tell Peter that Missouri is wonderful this time of year. Perhaps he will schedule a flight to the "show me state". :-) Dave On 1/10/2016 3:35 PM, John Thornton wrote: > I don't have AB drives... I have a filter on my GS2 and another one > after the control

Re: [Emc-users] Rewiring the BP

Just saw your message. If you keep the VFD powered off, do you still have noise issues ?? Dave On 1/4/2016 5:19 PM, John Thornton wrote: > I have 3 DC power supplies in the drive side, a 5vdc, a 24vdc, and a > 170vdc. > > The 5vdc power supply on the 0v side reads 37.6 ohms with the 0v and 5v >

Re: [Emc-users] Rewiring the BP

On 01/04/2016 07:34 PM, Mark Johnsen wrote: > Bertho - What you state about the different power supplies is a fear of > mine as I have a +-15vdc Power supply for the Op-amps for the West-Amp > servos, an open frame type 24Vdc power supply, plus the 5vdc power supply I > added for the 7i77. Many

Re: [Emc-users] Rewiring the BP

When nothing else works, it's wise to go back to the beginning. After so many suggestions, recommendations, and disagreements we have not solved this problem since last year. While grounding could be a major issue, it's not necessarily so in this case. As long as there is star wired ground.

[Emc-users] Rewiring the BP

s <ber...@vagrearg.org> > Subject: Re: [Emc-users] Rewiring the BP > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Message-ID: <568aa25a.1040...@vagrearg.org> > Content-Type: text/plain; charset=windows-1252 > >

Re: [Emc-users] Rewiring the BP

I have 3 DC power supplies in the drive side, a 5vdc, a 24vdc, and a 170vdc. The 5vdc power supply on the 0v side reads 37.6 ohms with the 0v and 5v sides connected to the 7i77 5v plug. The 7i77 is the only thing it powers up. When I unplug the 7i77 0v reads open so there is a path through

Re: [Emc-users] Rewiring the BP

On 01/04/2016 05:34 PM, John Thornton wrote: > Well I grounded X2 to the main ground and when I started LinuxCNC and > started to home I got the flurry of sserial errors. So I thought about > it for a bit and maybe the ground from the computer case to the ground > block was creating a ground

Re: [Emc-users] Rewiring the BP

Well I grounded X2 to the main ground and when I started LinuxCNC and started to home I got the flurry of sserial errors. So I thought about it for a bit and maybe the ground from the computer case to the ground block was creating a ground loop so I took it off. Started LinuxCNC and

Re: [Emc-users] Rewiring the BP

What it boils down to is not the VFD but something in the DC or low voltage circuits. I don't have a modbus problem but rather a sserial problem. Thanks On 1/4/2016 3:00 PM, Rafael wrote: >When nothing else works, it's wise to go back to the beginning. After > so many suggestions,

Re: [Emc-users] Rewiring the BP - where to connect ground

> From: Gene Heskett [mailto:ghesk...@wdtv.com] >> >> Going really OT here (and I should probably start a new thread for >> this) - what beyond a 1:1 ratio makes a transformer an 'isolation' >> transformer. >> >No ohmic connection between primary and secondary. If there is, and its not just a

Re: [Emc-users] Rewiring the BP

I do have a "control transformer" which can be identified by the three fuses on top. One for X1 (secondary) and one each for L1 and L2. I went back and found out which was X1 and X2 and will correct my wiring today. My question is I have a filter on X1 and X2 should I ground before or after

Re: [Emc-users] Rewiring the BP - where to connect ground

On Saturday 02 January 2016 05:52:55 Ben Potter wrote: > > From: Gene Heskett [mailto:ghesk...@wdtv.com] > > > >> Going really OT here (and I should probably start a new thread for > >> this) - what beyond a 1:1 ratio makes a transformer an 'isolation' > >> transformer. > > > >No ohmic connection

Re: [Emc-users] Rewiring the BP

On Saturday 02 January 2016 07:26:08 John Thornton wrote: > I do have a "control transformer" which can be identified by the three > fuses on top. One for X1 (secondary) and one each for L1 and L2. I > went back and found out which was X1 and X2 and will correct my wiring > today. My question is

Re: [Emc-users] Rewiring the BP

It is a common practice to send out two hots and one neutral provided the two hots are not on the same phase. This is a copper saving thing On 1/1/2016 7:34 PM, John Dammeyer wrote: > Isn't it commonly called Split Phase in North America? > > Draw 15A on each side of the 120-0-120 VAC

Re: [Emc-users] Rewiring the BP

and it's true for electrical noise. John Dammeyer > -Original Message- > From: John Thornton [mailto:j...@gnipsel.com] > Sent: January-02-16 4:26 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Rewiring the BP > > I do have a "control transforme

Re: [Emc-users] Rewiring the BP

Before it. Literally run a green wire from the X2 terminal to the single point ground or to the steel backplane assuming you have one. The protective fuse on X1 should be prior to the filter also. Dave On 1/2/2016 7:26 AM, John Thornton wrote: > I do have a "control transformer" which can

Re: [Emc-users] Rewiring the BP

>>None of those seem to have an earthing spike _and_ a neutral to GND link. The top of page 20 shows something very similar to how houses are wired in the US (except that we have two hot wires running into the houses, whereas the diagram shows one) However it appears that the utility supplies

Re: [Emc-users] Rewiring the BP

Yes. And generally (old school US machine wiring) the hot (fused) leg for 120 VAC control wiring is red and the neutral is white, especially if there are higher voltages in the same cabinet (like 480). Then red is 120 AC control, white is Neutral, black is 240 or 480 AC power, Blue is DC

Re: [Emc-users] Rewiring the BP

This is one of those cases where electrical practices on opposite sides of oceans differ significantly. On Fri, Jan 1, 2016, at 12:29 PM, Bertho Stultiens wrote: > On 01/01/2016 05:47 PM, Dave Cole wrote: > > That's done all of the time. In fact it is part of the NEC (National > > Electric

Re: [Emc-users] Rewiring the BP

On 01/01/2016 07:25 PM, Kirk Wallace wrote: >> Machine wiring is different in that you can have scenarios where >> references are moved, especially in a 2-phase system where you are not >> using the neutral, which is the scenario we have here. > My understanding is, and I could be wrong, that

Re: [Emc-users] Rewiring the BP

Isn't it commonly called Split Phase in North America? Draw 15A on each side of the 120-0-120 VAC circuit and measure that with a clamp on ammeter and you get 15A on each leg. Put the clamp on meter on the white wire (the neutral return) and you get 0A. In effect the two phases are 180

Re: [Emc-users] Rewiring the BP

Thank you. Well said. John Dammeyer > -Original Message- > From: John Kasunich [mailto:jmkasun...@fastmail.fm] > Sent: January-01-16 4:41 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Rewiring the BP ... > > Three phase or single phase

Re: [Emc-users] Rewiring the BP

On Fri, Jan 1, 2016, at 08:18 PM, Bertho Stultiens wrote: > On 01/02/2016 01:41 AM, John Kasunich wrote: > > This is one of those cases where electrical practices on opposite > > sides of oceans differ significantly. > > Yes, there are some significant differences. That has become obvious. > >

Re: [Emc-users] Rewiring the BP

On 01/02/2016 01:41 AM, John Kasunich wrote: > This is one of those cases where electrical practices on opposite > sides of oceans differ significantly. Yes, there are some significant differences. That has become obvious. [snip] > Three phase or single phase doesn't matter. When a transformer

Re: [Emc-users] Rewiring the BP - where to connect ground

On 01/01/2016 10:28 PM, Bertho Stultiens wrote: > Short explanation: > You must ensure that a grounding connection does not carry current and > is located at such a point where a symmetric coupling can be achieved. > > A bit longer explanation: [snip] Just one comment on the explanation... It is

Re: [Emc-users] Rewiring the BP

On Friday 01 January 2016 12:03:23 John Thornton wrote: > I just looked at the control transformer and L1 and L2 (240v side are > fused with type CC fuses and X1 only on the 120v side is fused with a > slo-blow fuse. So I assume they intended X2 to be the "neutral". > > JT > An excellent

Re: [Emc-users] Rewiring the BP - where to connect ground

On Friday 01 January 2016 18:04:34 Ben Potter wrote: > > From: Bertho Stultiens [mailto:ber...@vagrearg.org] > > A bit longer explanation: > > See attached image. Outputs of the step-down transformer A and B are > > capacitively coupled to L1 and L2 through four parasitic capacitors. > > >

Re: [Emc-users] Rewiring the BP

On 27 December 2015 at 00:32, John Kasunich wrote: > Each house has a ground rod. The neutral from the transformer, the > house ground rod, a connection from the house cold water plumbing (if > copper), the neutrals from all the receptacles, and the ground wires from >

Re: [Emc-users] Rewiring the BP

__ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help

Re: [Emc-users] Rewiring the BP - where to connect ground

On 01/01/2016 08:24 PM, Rafael wrote: >> There are a lot of good reasons to tie one leg the transformer to ground >> besides to establish the safety ground and neutral as is common on the US. >> Intermittent faults to ground, with an ungrounded system, can cause the >> secondary of the transformer

Re: [Emc-users] Rewiring the BP

On 01/02/2016 12:24 AM, Gene Heskett wrote: > this is a single phase system delivering 240+ volts AC > to the two ends of a single core transformers primary winding. Well, yes and no. It depends on what you are looking at. The point in normal AC systems is that your ground potential is at or

Re: [Emc-users] Rewiring the BP - where to connect ground

> From: Bertho Stultiens [mailto:ber...@vagrearg.org] > A bit longer explanation: > See attached image. Outputs of the step-down transformer A and B are capacitively coupled to L1 and L2 through four parasitic capacitors. > Connecting A to ground when C1A not equal C2A or connecting B to ground

Re: [Emc-users] Rewiring the BP

On 01/02/2016 01:47 AM, John Kasunich wrote: > This is ENTIRELY a function of where you are and what language you > speak. (English and American are not the same language :-) Yes, and neither is my native language... I'm trying, so confusion is probably pre-programmed for some "features" and

Re: [Emc-users] Rewiring the BP

On Friday 01 January 2016 12:29:16 Bertho Stultiens wrote: > On 01/01/2016 05:47 PM, Dave Cole wrote: > > That's done all of the time. In fact it is part of the NEC > > (National Electric Code) that is followed (for the most part) in the > > US. Pretty much every house in the US is wired like

Re: [Emc-users] Rewiring the BP

On Friday 01 January 2016 12:34:37 Jon Elson wrote: > On 01/01/2016 06:02 AM, John Thornton wrote: > > Hi Jon, > > > > So tie say the 48v side to ground to create the neutral? I > > attached the drawing of what I have so far on the VFD side. > > With power off, use an Ohmmeter to verify the

Re: [Emc-users] Rewiring the BP

On 01/01/2016 08:13 PM, John Dammeyer wrote: > (Reposted with link to pdf fixed) > Here's what I did for my SouthBend Lathe. Not run with CNC but with my > Electronic Lead Screw. > http://www.autoartisans.com/Lathe/SouthBendPower.pdf The connection from the secondary to ground (chassis)

Re: [Emc-users] Rewiring the BP

On Fri, Jan 1, 2016, at 04:44 PM, Bertho Stultiens wrote: > On 01/01/2016 07:25 PM, Kirk Wallace wrote: > >> Machine wiring is different in that you can have scenarios where > >> references are moved, especially in a 2-phase system where you are not > >> using the neutral, which is the scenario

Re: [Emc-users] Rewiring the BP

Hi Gene, The frame is most solidly grounded. I'll do the tests in a bit. Keep in mind that I have a 240v to 120v step down transformer to supply the 120v not a normal house circuit. Again an effort to kill the noise. Which by the way I'm running 2.7 now after changing the wires on the

Re: [Emc-users] Rewiring the BP

On 12/31/2015 10:24 PM, John Thornton wrote: > I went and checked the control transformer and one side is 48v to ground > and the other side is 79v to ground. I guess I was confused by that. I did a quick calculation and if your protective ground has a voltage with a phase shift of about 62

Re: [Emc-users] Rewiring the BP

Ground to chassis is 0.01 ohm. JT On 1/1/2016 7:42 AM, Bertho Stultiens wrote: > There is one remaining measurement that you should do: Measure the DC > resistance between the chassis and the protective ground of the > wall-outlet. That should be close to zero. Then, assuming that the >

Re: [Emc-users] Rewiring the BP

Hi Jon, So tie say the 48v side to ground to create the neutral? I attached the drawing of what I have so far on the VFD side. Happy New year to you and I hope you stayed dry during the recent monsoon we got. JT On 12/31/2015 7:16 PM, Jon Elson wrote: On 12/31/2015 03:24 PM, John

Re: [Emc-users] Rewiring the BP

On 01/01/2016 01:02 PM, John Thornton wrote: > So tie say the 48v side to ground to create the neutral? I attached the > drawing of what I have so far on the VFD side. No, then you just short a capacitive path to ground. If you have no neutral, then you do not have it. All voltages you measure

Re: [Emc-users] Rewiring the BP

Yes, Anytime you have a 120 volt source for computer, misc power etc, you need to declare one side of the 120 vac winding the neutral (white wire) and tie that terminal to the machine frame. It similar to what is required at the service entrance of your house. The neutral is always tied to

Re: [Emc-users] Rewiring the BP

il.com] > Sent: January-01-16 8:14 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Rewiring the BP > > > Yes, > > Anytime you have a 120 volt source for computer, misc power etc, you > need to declare one side of the 120 vac winding the neutral (wh

Re: [Emc-users] Rewiring the BP

: Dave Cole [mailto:linuxcncro...@gmail.com] > Sent: January-01-16 8:14 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Rewiring the BP > > > Yes, > > Anytime you have a 120 volt source for computer, misc power etc, you > need to declare one side o

Re: [Emc-users] Rewiring the BP

On 01/01/2016 11:37 AM, andy pugh wrote: > On 1 January 2016 at 17:29, Bertho Stultiens wrote: >> The reason for /not/ connecting the ground on a secondary winding is to >> prevent a capacitively coupled ground path. > Another reason is that if you connect either secondary

Re: [Emc-users] Rewiring the BP

On 01/01/2016 08:47 AM, Dave Cole wrote: > On 1/1/2016 11:26 AM, Bertho Stultiens wrote: >> On 01/01/2016 05:13 PM, Dave Cole wrote: >>> Anytime you have a 120 volt source for computer, misc power etc, you >>> need to declare one side of the 120 vac winding the neutral (white wire) >>> and tie

Re: [Emc-users] Rewiring the BP

On 1/1/2016 11:26 AM, Bertho Stultiens wrote: > On 01/01/2016 05:13 PM, Dave Cole wrote: >> Anytime you have a 120 volt source for computer, misc power etc, you >> need to declare one side of the 120 vac winding the neutral (white wire) >> and tie that terminal to the machine frame. >> It similar

Re: [Emc-users] Rewiring the BP

I just looked at the control transformer and L1 and L2 (240v side are fused with type CC fuses and X1 only on the 120v side is fused with a slo-blow fuse. So I assume they intended X2 to be the "neutral". JT On 1/1/2016 10:15 AM, Gene Heskett wrote: > On Friday 01 January 2016 07:00:31 John

Re: [Emc-users] Rewiring the BP

On 01/01/2016 05:47 PM, Dave Cole wrote: > That's done all of the time. In fact it is part of the NEC (National > Electric Code) that is followed (for the most part) in the US. > Pretty much every house in the US is wired like that. (I'm not making > this stuff up. :-) ) I agree with the

Re: [Emc-users] Rewiring the BP

On 1 January 2016 at 17:29, Bertho Stultiens wrote: > The reason for /not/ connecting the ground on a secondary winding is to > prevent a capacitively coupled ground path. Another reason is that if you connect either secondary winding end to ground using body parts then

Re: [Emc-users] Rewiring the BP

On Friday 01 January 2016 07:00:31 John Thornton wrote: > Hi Gene, > > The frame is most solidly grounded. I'll do the tests in a bit. Keep > in mind that I have a 240v to 120v step down transformer to supply the > 120v not a normal house circuit. Again an effort to kill the noise. > Which by the

Re: [Emc-users] Rewiring the BP

On 01/01/2016 05:13 PM, Dave Cole wrote: > Anytime you have a 120 volt source for computer, misc power etc, you > need to declare one side of the 120 vac winding the neutral (white wire) > and tie that terminal to the machine frame. > It similar to what is required at the service entrance of

Re: [Emc-users] Rewiring the BP

On 01/01/2016 06:02 AM, John Thornton wrote: > Hi Jon, > > So tie say the 48v side to ground to create the neutral? I > attached the drawing of what I have so far on the VFD side. > With power off, use an Ohmmeter to verify the secondary is isolated from the frame. If so, tie either end to

Re: [Emc-users] Rewiring the BP

On 01/01/2016 09:29 AM, Bertho Stultiens wrote: ... snip > Machine wiring is different in that you can have scenarios where > references are moved, especially in a 2-phase system where you are not > using the neutral, which is the scenario we have here. ... snip My understanding is, and I could

Re: [Emc-users] Rewiring the BP

On 12/31/2015 03:24 PM, John Thornton wrote: > I went and checked the control transformer and one side is 48v to ground > and the other side is 79v to ground. I guess I was confused by that. > Do you have a ground connected to that winding? If not, then the capacitance of that winding to other

Re: [Emc-users] Rewiring the BP

On the 120v side if I measure from the hot to the ground I get 79 volts, if I measure from hot to neutral I get the expected 128v... what is that telling me? JT On 12/25/2015 4:51 PM, John Thornton wrote: > I think a fresh thread is in order for this ordeal. > > I'm starting at the plug... I

Re: [Emc-users] Rewiring the BP

I went and checked the control transformer and one side is 48v to ground and the other side is 79v to ground. I guess I was confused by that. JT On 12/25/2015 4:51 PM, John Thornton wrote: > I think a fresh thread is in order for this ordeal. > > I'm starting at the plug... I dug up some 10-3

Re: [Emc-users] Rewiring the BP

On 12/31/2015 10:20 PM, John Thornton wrote: > On the 120v side if I measure from the hot to the ground I get 79 volts, > if I measure from hot to neutral I get the expected 128v... what is that > telling me? It tells you: (protective) Ground != Neutral (protective) Ground is for protection,

Re: [Emc-users] Rewiring the BP

On Thursday 31 December 2015 16:20:40 John Thornton wrote: > On the 120v side if I measure from the hot to the ground I get 79 > volts, if I measure from hot to neutral I get the expected 128v... > what is that telling me? > > JT My first guess is that the Bridgeport itself, is not grounded. It

Re: [Emc-users] Rewiring the BP

Hi, RS232 is an old connection from terminals (DTE) to modems (DCE). at some point, every wire in the 25 line cable had active signals. To connect two DTEs together, you need a "null modem" crossover. The most typical null modem does the following. (I will note the pin number on the DB25

Re: [Emc-users] Rewiring the BP

On 12/29/2015 08:59 PM, John Thornton wrote: > An update, I got the serial isolator but it did not work out of the box. > It had something about DTE and DCE that I didn't understand how to tell > what the GS2 uses and can't find anything about DTE or DCE in the manual... DTE/DCE is whether you

Re: [Emc-users] Rewiring the BP

An update, I got the serial isolator but it did not work out of the box. It had something about DTE and DCE that I didn't understand how to tell what the GS2 uses and can't find anything about DTE or DCE in the manual... JT On 12/25/2015 4:51 PM, John Thornton wrote: > I think a fresh thread

Re: [Emc-users] Rewiring the BP

I was in a plant and the maintenance guy was bitching about blowing up a plc he just hooked up and I asked him where he hooked it up... he showed me where the breaker was and it was on the 277 lighting circuit of a 3 phase panel. On 12/27/2015 9:25 PM, Dave Cole wrote: > Well, if you ran a

Re: [Emc-users] Rewiring the BP

On Sunday 27 December 2015 13:16:17 Bruce Layne wrote: > On 12/26/2015 06:51 PM, John Thornton wrote: > > There is no neutral in the machine, only L1 L2 and GND. The Neutral > > for the house is bonded to ground at the panels. > > Electrician's Joke: > > Q: What's the difference between neutral

Re: [Emc-users] Rewiring the BP

well there is no neutral because it's a 240vac circuit only... On 12/27/2015 12:16 PM, Bruce Layne wrote: > > On 12/26/2015 06:51 PM, John Thornton wrote: >> There is no neutral in the machine, only L1 L2 and GND. The Neutral for >> the house is bonded to ground at the panels. > Electrician's

Re: [Emc-users] Rewiring the BP

On 12/26/2015 06:51 PM, John Thornton wrote: > There is no neutral in the machine, only L1 L2 and GND. The Neutral for > the house is bonded to ground at the panels. Electrician's Joke: Q: What's the difference between neutral and ground? A: About six inches. There's a very good reason the

Re: [Emc-users] Rewiring the BP

Except for underground rural power where every house has a pad mounted transformer due to the distance between houses (I love the distance). I bonded the neutral to the ground at both panels in the shop/garage and the panel at the house. I have ground rods at the house and shop/garage. The

Re: [Emc-users] Rewiring the BP

I've built a bunch of automation machines for Briggs and Stratton and they never pull a neutral only 3 240v hots and a ground. We always have a control transformer for the 120v stuff... I have the same here now. On 12/27/2015 3:52 PM, Gene Heskett wrote: > On Sunday 27 December 2015 16:17:20

Re: [Emc-users] Rewiring the BP

On Sunday 27 December 2015 18:21:33 John Thornton wrote: > The VFD filter has no place to connect a neutral... only hots and > ground. > Goody. But if it works, hey! > On 12/27/2015 5:10 PM, Gene Heskett wrote: > > On Sunday 27 December 2015 17:07:15 John Thornton wrote: > >> I've built a bunch

Re: [Emc-users] Rewiring the BP

On 12/28/2015 04:25 AM, Dave Cole wrote: [snip] > I do a lot of machine wiring and I was redoing a machine for a major > electrical manufacturer in the US (although this particular plant does > hydraulics) > and the plant maintenance nitwits tied a relay coil between a 480 volt > hot leg and

Re: [Emc-users] Rewiring the BP

On Sunday 27 December 2015 16:17:20 John Thornton wrote: > well there is no neutral because it's a 240vac circuit only... > The only reason there is not a neutral is that the wire was never pulled. And I am not sure that missing neutral is NEC kosher. My copy is now 17 years old, so I think

Re: [Emc-users] Rewiring the BP

On Sunday 27 December 2015 17:07:15 John Thornton wrote: > I've built a bunch of automation machines for Briggs and Stratton and > they never pull a neutral only 3 240v hots and a ground. We always > have a control transformer for the 120v stuff... I have the same here > now. After an hours

Re: [Emc-users] Rewiring the BP

The VFD filter has no place to connect a neutral... only hots and ground. On 12/27/2015 5:10 PM, Gene Heskett wrote: > On Sunday 27 December 2015 17:07:15 John Thornton wrote: > >> I've built a bunch of automation machines for Briggs and Stratton and >> they never pull a neutral only 3 240v hots

Re: [Emc-users] Rewiring the BP

: John Thornton [j...@gnipsel.com] Sent: Sunday, December 27, 2015 2:07 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Rewiring the BP I've built a bunch of automation machines for Briggs and Stratton and they never pull a neutral only 3 240v hots and a ground. We always have

Re: [Emc-users] Rewiring the BP

On Sunday 27 December 2015 17:07:15 John Thornton wrote: > I've built a bunch of automation machines for Briggs and Stratton and > they never pull a neutral only 3 240v hots and a ground. We always > have a control transformer for the 120v stuff... I have the same here > now. > That would also

Re: [Emc-users] Rewiring the BP

Well, if you ran a neutral to the BP what would you use it for ?? :-) It isn't required by the NEC. What you can't do is to tie a 120 VAC load between a hot wire and the protective ground (which JT is not doing ). I do a lot of machine wiring and I was redoing a machine for a major

Re: [Emc-users] Rewiring the BP

On 12/26/2015 07:36 PM, John Thornton wrote: > You misunderstand, all those components are internally grounded I did > not ground any of them. I just showed that the shell on each component > is bonded to the ground connection on each device. Ok, now the real question is whether you can see the

Re: [Emc-users] Rewiring the BP

On 12/26/2015 08:09 PM, John Thornton wrote: > I found this on amazon > http://www.amazon.com/UT-211-Port-powered-Mini-size-PhotoElectric-Isolator/dp/B00GI9GS58/ref=sr_1_3?ie=UTF8=1451156759=8-3=serial+isolator That is "port-powered", which may or may not work in your case. It depends on which

Re: [Emc-users] Rewiring the BP

On 12/26/2015 08:19 PM, Bertho Stultiens wrote: >> Not sure how I might isolate the VFD from the chassis at this moment. >> Well I could machine some delrin standoffs... I have a machine shop. > > No problem. If you ensure that the chassis connection is firm and > electrically sound, then you

Re: [Emc-users] Rewiring the BP

On 12/26/2015 07:16 AM, John Thornton wrote: > I just checked the ground to housing on the VFD filter, VFD, computer, > and the smaller filter and they are all internally connected to ground. > The VFD is controlled via modbus so I don't know how to check that cable > (which is just a phone cable

Re: [Emc-users] Rewiring the BP

I have a large ferrite bracelet for the output of the VFD to the spindle motor. The computer is fairly new... I have some Cat-5 and Cat-6 cable and the DB9 looks like a solder type shell. JT On 12/26/2015 11:53 AM, Rafael wrote: > On 12/26/2015 07:16 AM, John Thornton wrote: >> I just

Re: [Emc-users] Rewiring the BP

You misunderstand, all those components are internally grounded I did not ground any of them. I just showed that the shell on each component is bonded to the ground connection on each device. On 12/26/2015 12:05 PM, Bertho Stultiens wrote: > On 12/26/2015 04:33 PM, John Thornton wrote: >> The

Re: [Emc-users] Rewiring the BP

I found this on amazon http://www.amazon.com/UT-211-Port-powered-Mini-size-PhotoElectric-Isolator/dp/B00GI9GS58/ref=sr_1_3?ie=UTF8=1451156759=8-3=serial+isolator Not sure how I might isolate the VFD from the chassis at this moment. Well I could machine some delrin standoffs... I have a machine

Re: [Emc-users] Rewiring the BP

On 12/26/2015 08:19 PM, Bertho Stultiens wrote: > On 12/26/2015 08:09 PM, John Thornton wrote: >> I found this on amazon >> http://www.amazon.com/UT-211-Port-powered-Mini-size-PhotoElectric-Isolator/dp/B00GI9GS58/ref=sr_1_3?ie=UTF8=1451156759=8-3=serial+isolator > > That is "port-powered", which

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