Grounding is really important. Noise on logical ground usually cause communication errors and could of course trigger a limit swith, have you tried lower input impedance?
A common mode filter on the output may be a good idea. I have the theoretical knowledge but limited experience. Nicklas Karlsson On Sat, 7 Mar 2015 08:44:11 +0000 (GMT) russ...@lls.lls.com (Russell Brown) wrote: > > Many thanks for all the input chaps. > > The consensus seems to be > > a) Add a mains input filter. > b) Shield the limit switch wires. > c) Stick ferrites in. > d) Mask the problem with a debounce :-) > > As I have a pretty solid failing case, I figure it's worth while seeing > if A-C can fix it before masking the problem with a debounce. > > So I've ordered a filter; Schaffner FN2030 Series 16A 250 V ac 400Hz on > the basis that Arceurotrade suggest them for their spindles and RS stock > them :) > > I'll also replace the limit switch wires with twisted pair shielded and > sprinkle some ferrites on the 7i76 inputs. > > I'll report back on the results. > > -- > Regards, > Russell > -------------------------------------------------------------------- > | Russell Brown | MAIL: russ...@lls.com PHONE: 01780 471800 | > | Lady Lodge Systems | WWW Work: http://www.lls.com | > | Peterborough, England | WWW Play: http://www.ruffle.me.uk | > -------------------------------------------------------------------- > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming The Go Parallel Website, sponsored > by Intel and developed in partnership with Slashdot Media, is your hub for all > things parallel software development, from weekly thought leadership blogs to > news, videos, case studies, tutorials and more. Take a look and join the > conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
