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
