On 9/7/2016 12:53 AM, Gene Heskett wrote: > On Wednesday 07 September 2016 01:41:24 Dave Caroline wrote: > >> That looks like a board I would not recommend look close to the white >> sockets near the axis outputs, it has series resistors for the driver >> optos, these of course are in the driver as well, this means half >> current through the opto and failure to work. >> >> I was working with a free issue board where I met that problem before > So have I, Dave, and I wound up bypassing that particular opto in the > board I used to drive my G0704, but this one doesn't have the opto's > that I know of. Because they are slow, I've found them far more trouble > than they are worth as a safety measure. I'd much druther trust a good > grounding system, star topology of course. > > Thanks Dave.
I similarly dislike optos. I have doubts that any properly made drive can even produce dangerous "spikes". They seem pointless. I work with a 7i92 card which is ethernet, and thus already offers galvanic isolation through the ethernet. If there were a huge surge, it wouldn't propagate back to the PC. The PC ain't a high-dollar item anyways. The AM882 drives all have differential opto inputs/outputs themselves, there's no case for even hypothetical "spikes". Danny >> Dave Caroline >> >> ---------------------------------------------------------------------- >> -------- _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
