Many commercially available PWM drives require using shielded cable for the motor. Also shielded Ethernet cable is used in many industrial applications, but for the shielded Ethernet cable to work you must also have RJ-45 connectors that have a metal shell with tabs to touch the shield on the cable connector.
John Figie On Wed, Nov 26, 2014 at 4:10 PM, Karlsson & Wang < nicklas.karls...@karlssonwang.se> wrote: > I would place the bead closer to the driver but I may be wrong. I assume > fast voltage transistion is generated by the transistor so it would be > better to limit the voltage derivative or in this case it will be a high > frequency impedance in form of an inductor with a few turns with some space > in between. I expect the tightly linded motor windings to have some > parasitic impedance which I want to work around but I may be wrong. > > > > On Wed, 26 Nov 2014 23:17:48 +0200 > Marius Liebenberg <mar...@mastercut.co.za> wrote: > > > > > On 2014-11-26 22:12, Peter C. Wallace wrote: > > > On Wed, 26 Nov 2014, Karlsson & Wang wrote: > > > > > >> Date: Wed, 26 Nov 2014 20:53:56 +0100 > > >> From: Karlsson & Wang <nicklas.karls...@karlssonwang.se> > > >> Reply-To: "Enhanced Machine Controller (EMC)" > > >> <emc-users@lists.sourceforge.net> > > >> To: "Enhanced Machine Controller (EMC)" < > emc-users@lists.sourceforge.net> > > >> Subject: Re: [Emc-users] EMC communication problem then motor start > > >> > > >> The switching is very fast because gate transistor is 10 ohm so I > will increase as an intermediate solution. The problem is however still > interesting because it is so common. > > >> > > >> Nicklas Karlsson > > >> > > > One option that helps a lot on PWM drives is a common mode choke on > the PWM > > > outputs (a large ferrite bead on the 2 (DC) or 3 (AC) motor wires). > One major > > > problem with PWM outputs without slew rate limiting driving motor > windings is > > > the nearly unlimited current spike that happens at switching time > because > > > of the very fast slew rate PWM signal driving into wiring/ motor > winding to > > > ground capacitance. > > > > > Would you place the bead closer to the drive or closer to the motor? > > > > > > > > > > >> > > >> On Wed, 26 Nov 2014 19:34:44 +0000 > > >> David Armstrong <cncbas...@gmail.com> wrote: > > >> > > >>> i normaly make sure that all low voltage wiring is sheilded and > watch for > > >>> ground loops and vfd inputs are via filters and Balance transformers > , > > >>> ethernet coms are usually problem free so long as you use good > cables and > > >>> not the cheap Aluminium wire ones as they are using balanced paired > cores > > >>> , in 2 real major projects i ended up passing the low volt cables > inside > > >>> sheilding cut from ur67 coax > > >>> > > >>> > > >>> > > >>> On 26 November 2014 at 18:40, Karlsson & Wang < > > >>> nicklas.karls...@karlssonwang.se> wrote: > > >>> > > >>>> I have tried with USB isolator made with Icoupler devices from > analog > > >>>> devices on other products without luck. I am using ethernet which I > think > > >>>> have a isolation transformer. I do not think there are any > tolerances for > > >>>> missed packets right now. For serial communication I have tried opto > > >>>> couplers without with some improvement. I have also tried isolation > devices > > >>>> from I think Texas instruments made from differential drive over two > > >>>> capacitors and they are great but I do not think I could use them > for > > >>>> 100Mbit ethernet. > > >>>> > > >>>> I will increase tolerance for missed packets to be able to measure > > >>>> percentage of lost packets, it is not perfect but better than > nothing. I > > >>>> will also add a common mode inductor and maybe a shielded cable. > > >>>> > > >>>> I have encountered the problem on several products so it is not > isolated > > >>>> to just this one I built myself. > > >>>> > > >>>> > > >>>> Nicklas Karlsson > > >>>> > > >>>> > > >>>> > > >>>> > > >>>> On Wed, 26 Nov 2014 19:28:25 +0200 > > >>>> Marius Liebenberg <mar...@mastercut.co.za> wrote: > > >>>> > > >>>>> I have had many problems with USB communications with motors and > plasma. > > >>>>> You can overcome these by putting an electrically isolated barrier > in > > >>>>> the usb line. There are some chips from Linear (LTM2448) that will > do > > >>>>> just that. The equipment on either end cannot be connected to the > same > > >>>>> ground or supply if you go this route. > > >>>>> > > >>>>> On 2014-11-26 19:07, Karlsson & Wang wrote: > > >>>>>> PWM is great for efficient motor but unfortunately it is also very > > >>>> good at disturbing digital communication. Do anybody had any > problems with > > >>>> the communication errors then motor start? > > >>>>>> Nicklas Karlsson > > >>>>>> > > >>>>>> > > >>>> > ------------------------------------------------------------------------------ > > >>>>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > >>>>>> from Actuate! Instantly Supercharge Your Business Reports and > > >>>> Dashboards > > >>>>>> with Interactivity, Sharing, Native Excel Exports, App > Integration & > > >>>> more > > >>>>>> Get technology previously reserved for billion-dollar > corporations, > > >>>> FREE > > >>>> > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > >>>>>> _______________________________________________ > > >>>>>> Emc-users mailing list > > >>>>>> Emc-users@lists.sourceforge.net > > >>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > > >>>>>> > > >>>>> -- > > >>>>> > > >>>>> Regards /Groete > > >>>>> > > >>>>> Marius D. Liebenberg > > >>>>> +27 82 698 3251 > > >>>>> +27 12 743 6064 > > >>>>> QQ 1767394877 > > >>>>> > > >>>>> > > >>>>> > > >>>> > ------------------------------------------------------------------------------ > > >>>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > >>>>> from Actuate! Instantly Supercharge Your Business Reports and > Dashboards > > >>>>> with Interactivity, Sharing, Native Excel Exports, App Integration > & more > > >>>>> Get technology previously reserved for billion-dollar > corporations, FREE > > >>>>> > > >>>> > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > >>>>> _______________________________________________ > > >>>>> Emc-users mailing list > > >>>>> Emc-users@lists.sourceforge.net > > >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > > >>>> > > >>>> > ------------------------------------------------------------------------------ > > >>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > >>>> from Actuate! Instantly Supercharge Your Business Reports and > Dashboards > > >>>> with Interactivity, Sharing, Native Excel Exports, App Integration > & more > > >>>> Get technology previously reserved for billion-dollar corporations, > FREE > > >>>> > > >>>> > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > >>>> _______________________________________________ > > >>>> Emc-users mailing list > > >>>> Emc-users@lists.sourceforge.net > > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > > >>>> > > >>> > ------------------------------------------------------------------------------ > > >>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > >>> from Actuate! Instantly Supercharge Your Business Reports and > Dashboards > > >>> with Interactivity, Sharing, Native Excel Exports, App Integration & > more > > >>> Get technology previously reserved for billion-dollar corporations, > FREE > > >>> > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > >>> _______________________________________________ > > >>> Emc-users mailing list > > >>> Emc-users@lists.sourceforge.net > > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > > >> > ------------------------------------------------------------------------------ > > >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > >> from Actuate! Instantly Supercharge Your Business Reports and > Dashboards > > >> with Interactivity, Sharing, Native Excel Exports, App Integration & > more > > >> Get technology previously reserved for billion-dollar corporations, > FREE > > >> > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > >> _______________________________________________ > > >> 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 him gain world domination. > > > > > > > > > > ------------------------------------------------------------------------------ > > > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > > from Actuate! Instantly Supercharge Your Business Reports and > Dashboards > > > with Interactivity, Sharing, Native Excel Exports, App Integration & > more > > > Get technology previously reserved for billion-dollar corporations, > FREE > > > > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > -- > > > > Regards /Groete > > > > Marius D. Liebenberg > > +27 82 698 3251 > > +27 12 743 6064 > > QQ 1767394877 > > > > > > > ------------------------------------------------------------------------------ > > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > > with Interactivity, Sharing, Native Excel Exports, App Integration & more > > Get technology previously reserved for billion-dollar corporations, FREE > > > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! 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