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 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! 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