Gene, I don't think these optos have anything to do with SSRs. These are not designed to pass power, just an open collector output logic circuit. The AC voltage is the rating of the breakdown voltage.
jerry On Tue, Dec 15, 2015 at 10:09 AM, Gene Heskett <ghesk...@wdtv.com> wrote: > On Tuesday 15 December 2015 10:33:55 John Kasunich wrote: > > > On Mon, Dec 14, 2015, at 10:51 PM, Gene Heskett wrote: > > > On Monday 14 December 2015 19:11:49 Jerry Scharf wrote: > > > > Hi, > > > > > > > > Just did a super quick google search and came up with a fairchild > > > > optocoupler hcpl2530 that will do 1Mbps. ~1.80 USD quantity 1. > > > > Isolation to 480v and good common mode rejection. There are a > > > > number of devices in similar and better speeds. > > > > > > I was wondering if faster stuff was filtering down into the > > > afordable category in the last decade, But only 480 volt isolation? > > > that would have to be mesa isolated on the same substrate, edge > > > emitting diodes facing edge sensitive transistors. I think it > > > depends on the environment if thats enough isolation. With noise > > > from higher speed/volatge stepper drivers nearby, I'd be a tad > > > nervous. > > > > "Only" 480V? > > > > Jerry wasn't saying "these devices fail at 481V". They are UL > > approved for use as isolation between 480V power systems and > > low-voltage control. The actual isolation rating is far higher than > > that. The hipot test spec is 3750V RMS for 1 minute. > > > Thats much closer to what I was hopeing for John, thanks. Most it seems > are rate in the 4 to 5 thousand range. So I do not expect any surprises. > > > Optos are getting pretty good these days. At work I use the Renesas > > PS9924, an extra-wide body one that can meet safety regs at 690V AC, > > even at high altitudes where thinner air requires larger clearances. > > Hipot rating is 7500V RMS! Sub-100nS prop delays, easily handle 5MHz > > data. Cost is still under $10 each, $5 in quantity (a bargain if you > > need such performance). Datasheet: > > http://documentation.renesas.com/doc/YOUSYS/document/r08ds0059ej0100_p > >s_family.pdf > > These things are, I assume, SSR's at heart, meaning they are intended for > AC service only if ever expected to be turned off? > > The ones I have coming are probably older stuff and the SSR portion would > be slower too. But that, in this circuit, shouldn't be a concern. > They'll be a few days arriving, so I'll have plenty of time to conjure > up a safety bleeder. And figure out how to interlock it so it cannot be > re-enabled until the bleeder has done its thing and self disconnected. > I have some 3pdt ice cubes and one of those, self latching until the cap > is down, is likely to find a new home. > > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Some mill pix are at: > Genes Web page <http://geneslinuxbox.net:6309/gene/GO704-pix> > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Jerry Scharf FINsix IT 650.285.6361 w 650.279.7017 m ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
