Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.
Hi Stuart: Yes, especially if wound on a laminated core like a 3 phase transformer. In fact one could probably use the high current windings of a small 3 phase transformer. It would take a bit of research to chose the correct wire size, windings turns and etc to match your VFW and motor. Don On Tue, Jul 27, 2010 at 10:46 PM, Stuart Stevenson stus...@gmail.comwrote: I have seen reactors used to quiet a vfd. A reactor is merely a coil of wire. On Tue, Jul 27, 2010 at 3:57 PM, Andy Pugh a...@andypugh.fsnet.co.uk wrote: On 27 July 2010 21:43, Don Stanley dstanley1...@gmail.com wrote: The solution was a 5% KDR filter from TCI in Milwaukee Wi in the VFD output. I suspect some ferrite beads on the output lines helped with my rather troublesome VFD noise problem. Though I also added an input filter and shielded power cables at the same time, so don't have the data to deconvolve the various effects. The input filter was initially troublesome, tripping the ELCB in the main supply. The solution I found was to power the VFD through a zero-crossing SSR controlled by EMC2. As the mains voltage is always zero at switch-on there is no current spike into the filter caps, and no tripping of the breaker. So far it has been a 100% success for about a year. -- atp -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- dos centavos -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Spindle at speed Coordinated Motion problems?
On Tue, Jul 27, 2010 at 04:10:10PM +0100, Andy Pugh wrote: Motenc seemed very happy to lend me hardware for testing purposes, but I am concerned that I might end up with a sizeable customs bill to import it into the UK, which would be rather painful for hardware I do not intend to use other than to write a driver I don't need. If it's only on loan, you should be able to bring it in on a carnet. (http://en.wikipedia.org/wiki/ATA_Carnet) Normally the guys who want it back fill in the forms. The carnet is usually good for a year. Just don't send the equipment back without getting customs to process the carnet. ;-) Erik -- If a pig loses its voice, is it disgruntled? -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.
Don Stanley wrote: Hi Stuart: Yes, especially if wound on a laminated core like a 3 phase transformer. Actually, because of the high PWM frequency of the VFD, standard laminated steel transformer cores are not ideal. Ferrite cores will do much better. I have a high-speed spindle motor that has too low inductance, so I used some Renco 1.6 mH bobbin style ferrite inductors. This wasn't strictly a noise issue, it was to keep the PWM pulses from saturating the motor's iron core. But, ferrite core inductors should work fine for the noise issue, too. Probably 100 uH with a current rating to match the motor would do well. 3 separate cores would be better than one common one. Jon -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Spindle at speed Coordinated Motion problems?
On 28 July 2010 16:01, Erik Christiansen dva...@internode.on.net wrote: If it's only on loan, you should be able to bring it in on a carnet. (http://en.wikipedia.org/wiki/ATA_Carnet) I think I would rather pay than fill out a carnet again :-) I did it once for some cars which we sent to Tenerife for testing. Unusually long sheets of paper (won't fit in a printer) to be filled out in triplicate by typewriter, with no corrections allowed. I think the forms cost about £100 too (including the fee to the local Chamber of Commerce for holding the deposit) (Yes, I know that the sender does it, but I thought it was worth warning folks) -- atp -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] apt repository and automated installation for experimental 10.04/i386 packages
I'm pleased to announce that we've made it easier to try emc2 on Ubuntu 10.04: just download and run a shell script, which will download all the packages necessary for emc2. This requires a working network connection, and depending on the speed of your connection will take several minutes to complete. Instructions are here: http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Ubuntu10.04PackageNotes Jeff -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.
Why would they call that a reactor, rather than an inductor? Neil On Tue, Jul 27, 2010 at 7:46 PM, Stuart Stevenson stus...@gmail.com wrote: I have seen reactors used to quiet a vfd. A reactor is merely a coil of wire. On Tue, Jul 27, 2010 at 3:57 PM, Andy Pugh a...@andypugh.fsnet.co.uk wrote: On 27 July 2010 21:43, Don Stanley dstanley1...@gmail.com wrote: The solution was a 5% KDR filter from TCI in Milwaukee Wi in the VFD output. I suspect some ferrite beads on the output lines helped with my rather troublesome VFD noise problem. Though I also added an input filter and shielded power cables at the same time, so don't have the data to deconvolve the various effects. The input filter was initially troublesome, tripping the ELCB in the main supply. The solution I found was to power the VFD through a zero-crossing SSR controlled by EMC2. As the mains voltage is always zero at switch-on there is no current spike into the filter caps, and no tripping of the breaker. So far it has been a 100% success for about a year. -- atp -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- dos centavos -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- http://www.pixpopuli.com -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise.How To.
Inductive reactance? - Original Message - From: Neil Baylis neil.bay...@gmail.com To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Sent: Wednesday, July 28, 2010 13:45 Subject: Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise.How To. Why would they call that a reactor, rather than an inductor? Neil On Tue, Jul 27, 2010 at 7:46 PM, Stuart Stevenson stus...@gmail.com wrote: I have seen reactors used to quiet a vfd. A reactor is merely a coil of wire. On Tue, Jul 27, 2010 at 3:57 PM, Andy Pugh a...@andypugh.fsnet.co.uk wrote: On 27 July 2010 21:43, Don Stanley dstanley1...@gmail.com wrote: The solution was a 5% KDR filter from TCI in Milwaukee Wi in the VFD output. I suspect some ferrite beads on the output lines helped with my rather troublesome VFD noise problem. Though I also added an input filter and shielded power cables at the same time, so don't have the data to deconvolve the various effects. The input filter was initially troublesome, tripping the ELCB in the main supply. The solution I found was to power the VFD through a zero-crossing SSR controlled by EMC2. As the mains voltage is always zero at switch-on there is no current spike into the filter caps, and no tripping of the breaker. So far it has been a 100% success for about a year. -- atp -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- dos centavos -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- http://www.pixpopuli.com -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.
On Wed, Jul 28, 2010 at 12:03 PM, Jon Elson el...@pico-systems.com wrote: Don Stanley wrote: Hi Stuart: Yes, especially if wound on a laminated core like a 3 phase transformer. Actually, because of the high PWM frequency of the VFD, standard laminated steel transformer cores are not ideal. Ferrite cores will do much better. I have a high-speed spindle motor that has too low inductance, so I used some Renco 1.6 mH bobbin style ferrite inductors. This wasn't strictly a noise issue, it was to keep the PWM pulses from saturating the motor's iron core. But, ferrite core inductors should work fine for the noise issue, too. Probably 100 uH with a current rating to match the motor would do well. 3 separate cores would be better than one common one. Jon That is true, and the ferrite cores are faster and may be cheaper? When I look at my KDR filter it looks like a 3 phase laminated iron core transformer with only one winding per phase(no secondary). I don't know what they were planning, unless they wanted additional phase interaction for smoothing. Hope this helps Don -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.
Neil Baylis wrote: Why would they call that a reactor, rather than an inductor? Any device which shifts the phase of current relative to the applied voltage has a property called reactance. There can be capacitive reactance and inductive reactance. In the old school of electrical engineering, (that would be from about 1900 to 1930), capacitors were called condensers, and inductors were called reactors. Overexcited synchronous electric machines were even called synchronous condensers. Some EE terminology dates back to the days of Ben Franklin and static electric studies, I think that's where the condenser comes from, another term for the Leyden jar. Jon -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.
Don Stanley wrote: That is true, and the ferrite cores are faster and may be cheaper? When I look at my KDR filter it looks like a 3 phase laminated iron core transformer with only one winding per phase(no secondary). I don't know what they were planning, unless they wanted additional phase interaction for smoothing. Ferrite would rarely be cheaper than steel. If the windings for each phase run parallel, that is a common-mode choke, and there the main motor currents all cancel out, so laminated cores should be fine. Jon -- The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
