Re: [Emc-users] Single to Three Phase Rotary Converters
John, Thanks for the update. JRC On Sun, Mar 27, 2011 at 6:02 AM, John Thornton bjt...@gmail.com wrote: I can't find my drawings atm, so I'm recreating them from scratch and will post them as soon as done. Just wanted to let you know I did not forget although sometimes I do. John John Crane wrote: Thanks, John R. Crane On Mon, Mar 21, 2011 at 7:27 AM, John Thorntonbjt...@gmail.com wrote: John, I'll dig out my schematic and make sure it is up to date and figure a way to post it to the list. John John Crane wrote: John, I would like to know more about the way you have engineered your phase converters. I am in the process of adding this capability in my shop. Thanks, John R. Crane On Thu, Mar 17, 2011 at 5:53 AM, John Thorntonbjt...@gmail.com wrote: I have three rotary phase converters. The are all using a potential relay for the start caps and a relay that pulls in the mains. So I don't have to hold the push button and if the power drops out for a few seconds the phase converter does not try and restart without the start caps. I've not had the fun of blowing anything up when building them. They are all balanced phase to phase within a couple of volts. However phase to phase the run caps are very different in order to get the voltage phase to phase to balance. I can post some details if anyone is interested... John Dave wrote: Back when I put my 10 hp phase converter together, I found some charts on the web someplace about suggested capacitor sizing. I found a cheap supply of capacitors at Mendelson's in Dayton, Ohio and bought a small box of them. I ended up using I believe, 4 - 330 uf 330 volt units as starting caps and 4- 135 uf run caps.I use a push button to start the motor and as long as I hold the button down the starting caps are wired into the circuit. When the motor spins up I release the button. I tried to use a voltage sensitive relay, like the ones used on refrigeration systems and AC systems, but it was not reliable probably due to the high current from the large number of caps. There is also a motor contactor that seals itself in via the button push. That way if the line power drops, the contactor drops out and the converter idler motor and he attached slave motors are powered down. The math relating to how this works gets even more complicated when you consider the effects of hooking a 3 phase motor that you are going to start (a slave motor) across the the idling phase converter motor. For a brief period of time, the idler motor becomes a generator. The rotor slows slightly and the energy in the rotor pumps power into the three phases and spins up the slaved motor.It works very well. During experimentation, it is very obvious when more starting capacitors are required as the motor will simply not spin up. Adding more run caps helps balance the phases but they never really fully balance. Safety glasses are very good idea when experimenting.Starting caps go off like firecrackers if you overstress them.They are only designed to be switched in for a few seconds. A source of cheap starting caps is a really good idea if you want to do some phase converter experimentation. I blew up several of them. Dave On 3/14/2011 9:01 PM, Jon Elson wrote: On 14 March 2011 10:50, John Thorntonbjt...@gmail.com wrote: Is it not amazing that the hillbillies from backwoods Missouri with a 3rd grade education can make a rotary phase converter without all the math... Of course! The trick is the windings in the motor do all the math for you, all you need to do is hook up the wires. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap
Re: [Emc-users] Single to Three Phase Rotary Converters
Thanks, John R. Crane On Mon, Mar 21, 2011 at 7:27 AM, John Thornton bjt...@gmail.com wrote: John, I'll dig out my schematic and make sure it is up to date and figure a way to post it to the list. John John Crane wrote: John, I would like to know more about the way you have engineered your phase converters. I am in the process of adding this capability in my shop. Thanks, John R. Crane On Thu, Mar 17, 2011 at 5:53 AM, John Thorntonbjt...@gmail.com wrote: I have three rotary phase converters. The are all using a potential relay for the start caps and a relay that pulls in the mains. So I don't have to hold the push button and if the power drops out for a few seconds the phase converter does not try and restart without the start caps. I've not had the fun of blowing anything up when building them. They are all balanced phase to phase within a couple of volts. However phase to phase the run caps are very different in order to get the voltage phase to phase to balance. I can post some details if anyone is interested... John Dave wrote: Back when I put my 10 hp phase converter together, I found some charts on the web someplace about suggested capacitor sizing. I found a cheap supply of capacitors at Mendelson's in Dayton, Ohio and bought a small box of them. I ended up using I believe, 4 - 330 uf 330 volt units as starting caps and 4- 135 uf run caps.I use a push button to start the motor and as long as I hold the button down the starting caps are wired into the circuit. When the motor spins up I release the button. I tried to use a voltage sensitive relay, like the ones used on refrigeration systems and AC systems, but it was not reliable probably due to the high current from the large number of caps. There is also a motor contactor that seals itself in via the button push. That way if the line power drops, the contactor drops out and the converter idler motor and he attached slave motors are powered down. The math relating to how this works gets even more complicated when you consider the effects of hooking a 3 phase motor that you are going to start (a slave motor) across the the idling phase converter motor. For a brief period of time, the idler motor becomes a generator. The rotor slows slightly and the energy in the rotor pumps power into the three phases and spins up the slaved motor.It works very well. During experimentation, it is very obvious when more starting capacitors are required as the motor will simply not spin up. Adding more run caps helps balance the phases but they never really fully balance. Safety glasses are very good idea when experimenting.Starting caps go off like firecrackers if you overstress them.They are only designed to be switched in for a few seconds. A source of cheap starting caps is a really good idea if you want to do some phase converter experimentation. I blew up several of them. Dave On 3/14/2011 9:01 PM, Jon Elson wrote: On 14 March 2011 10:50, John Thorntonbjt...@gmail.com wrote: Is it not amazing that the hillbillies from backwoods Missouri with a 3rd grade education can make a rotary phase converter without all the math... Of course! The trick is the windings in the motor do all the math for you, all you need to do is hook up the wires. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today
Re: [Emc-users] Single to Three Phase Rotary Converters
John, I would like to know more about the way you have engineered your phase converters. I am in the process of adding this capability in my shop. Thanks, John R. Crane On Thu, Mar 17, 2011 at 5:53 AM, John Thornton bjt...@gmail.com wrote: I have three rotary phase converters. The are all using a potential relay for the start caps and a relay that pulls in the mains. So I don't have to hold the push button and if the power drops out for a few seconds the phase converter does not try and restart without the start caps. I've not had the fun of blowing anything up when building them. They are all balanced phase to phase within a couple of volts. However phase to phase the run caps are very different in order to get the voltage phase to phase to balance. I can post some details if anyone is interested... John Dave wrote: Back when I put my 10 hp phase converter together, I found some charts on the web someplace about suggested capacitor sizing. I found a cheap supply of capacitors at Mendelson's in Dayton, Ohio and bought a small box of them. I ended up using I believe, 4 - 330 uf 330 volt units as starting caps and 4- 135 uf run caps.I use a push button to start the motor and as long as I hold the button down the starting caps are wired into the circuit. When the motor spins up I release the button. I tried to use a voltage sensitive relay, like the ones used on refrigeration systems and AC systems, but it was not reliable probably due to the high current from the large number of caps. There is also a motor contactor that seals itself in via the button push. That way if the line power drops, the contactor drops out and the converter idler motor and he attached slave motors are powered down. The math relating to how this works gets even more complicated when you consider the effects of hooking a 3 phase motor that you are going to start (a slave motor) across the the idling phase converter motor. For a brief period of time, the idler motor becomes a generator. The rotor slows slightly and the energy in the rotor pumps power into the three phases and spins up the slaved motor.It works very well. During experimentation, it is very obvious when more starting capacitors are required as the motor will simply not spin up. Adding more run caps helps balance the phases but they never really fully balance. Safety glasses are very good idea when experimenting.Starting caps go off like firecrackers if you overstress them.They are only designed to be switched in for a few seconds. A source of cheap starting caps is a really good idea if you want to do some phase converter experimentation. I blew up several of them. Dave On 3/14/2011 9:01 PM, Jon Elson wrote: On 14 March 2011 10:50, John Thorntonbjt...@gmail.comwrote: Is it not amazing that the hillbillies from backwoods Missouri with a 3rd grade education can make a rotary phase converter without all the math... Of course! The trick is the windings in the motor do all the math for you, all you need to do is hook up the wires. Jon -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Qcad
In UbuntuMenu bar --System --Administration --Synaptic Package Manager On Tue, Nov 4, 2008 at 5:08 AM, Mark Wendt (Contractor) [EMAIL PROTECTED] wrote: At 06:00 AM 11/4/2008, you wrote: Hi all I am going to download Qcad, good for engrave-11.py. I saw the following: To install Qcad (and you will want that as well) go to system administration synaptic pacage manager. Do a search for qcad... check off qcad and qcad-doc say yes to the extra pacages needed by qcad and follow the bouncing ball to install... might take 5 minutes on dialup. system administration synaptic pacage manager hmmm does any one know where this may be, is it on a web page somewhere? Many thanks Dave Dave, It's under one of the pull down menus on your main screen window manager bar. Mark - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Free 3D CADs on Linux WAS: BRL-CAD
Mark, Link to Salome cad. I am not familiar with this software at this point but I will be testing. http://www.salome-platform.org/home/presentation/overview/ Reg On Thu, Oct 30, 2008 at 4:35 AM, Mark Wendt (Contractor) [EMAIL PROTECTED] wrote: At 08:52 PM 10/29/2008, you wrote: snippage The tool I end up with is SALOME. See caelinux.org. It is real 3D CAD as BRL-CAD. Compare to BRL-CAD, SALOME has advantages of quite advanced GUI, support for stl, iges and step formats, faster renderer and does not require drag on intermediate objects that much. SALOME has robust support for operations with solids, at the same time it support construction of solids from shapes (similar to usual SolidWorks approach). Set of CAD features is not as extensive as in commercial products, but quite good, with support of transformations, scaling, muli-directional transformations and as mentioned earlier full set of operations with solids. So far I'm quite happy with SALOME and could do all 3D CAD models I needed using it. I would recommend it to anybody looking for free 3D CAD working under Linux. Sergey, Wandered around the caelinux.org site, and didn't see a reference to SALOME. Do you have a link to the software and the details about it? Mark - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] nc programming application
Stuart, I did download the header file and had it in the same directory, but I found the problem. My compiler wasn't set up correctly. Thanks for the support. On Jan 11, 2008 9:01 AM, Stuart Stevenson [EMAIL PROTECTED] wrote: -- Message: 6 Date: Thu, 10 Jan 2008 20:34:29 -0600 From: John Crane [EMAIL PROTECTED] Subject: Re: [Emc-users] nc programming application To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=iso-8859-1 I am using Dev-Cpp to compile and cannot get it to compile. I get the error 'no header file found'. What am I doing wrong? Reg On Jan 10, 2008 7:45 AM, Stuart Stevenson [EMAIL PROTECTED] wrote: Gentlemen, Just the ticket. Works great. Many thanks. The corrected file is on www.mpm1.com:8080. Use it, extend it, share it. Have fun. Stuart - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- next part -- An HTML attachment was scrubbed... Did you download the header file also? If not get it and place it in the same directory as the file you are trying to compile or a directory in your $PATH - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] nc programming application
I am using Dev-Cpp to compile and cannot get it to compile. I get the error 'no header file found'. What am I doing wrong? Reg On Jan 10, 2008 7:45 AM, Stuart Stevenson [EMAIL PROTECTED] wrote: Gentlemen, Just the ticket. Works great. Many thanks. The corrected file is on www.mpm1.com:8080. Use it, extend it, share it. Have fun. Stuart - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Minertia Motor (Yaskawa) Servos
Thanks for the info Jon. I will do some more digging on their site for the complete specs of these systems. I'm sure I will have more questions. Reg On 9/9/07, Jon Elson [EMAIL PROTECTED] wrote: Svenne Larsson wrote: I'm planning to use them together with a set of Rutex controllers. Not there yet, but in a very near future I have more to tell. :) Oh, there will be lots more to tell, I am afraid. The Minertia motors have extremely small inductance, as they are ironless rotor motors. I think the circulating triangle wave current with the unfiltered Rutex drive will be a problem. It may cause excessive heating of the motor, drive or both. You may want to consult with Rutex on putting an inductor in series with the motor before you even connect it up the first time. Jon - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Minertia Motor (Yaskawa) Servos
Has anyone ever connected EMC to Yaskawa servos? I have a 4 axis machine that was designed as a laser solder machine some 15 years ago. The servos are a brush type Minertia Motor # UGRMEM-02MAKOE with UTOPI-04OMX optical encoder (400 pulses/rev). The controller is FR01RB7-R2M. Any info would be appreciated. Reg - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
