On Wednesday 06 January 2016 09:21:48 andy pugh wrote: > On 6 January 2016 at 14:01, Gene Heskett <ghesk...@wdtv.com> wrote: > >> Ideally it needs to be a force-guided relay, with the main power > >> feed (or surrogate thereof) through a second set of terminals > > > > That thought has crossed my mind too, but the power relays I have, > > with an aux set of contacts that could feed the interlock, are all > > NO types. NC versions seem rare, and pricy. $100 USD range. > > Where are you looking? > > I am using one of these: > http://uk.rs-online.com/web/p/non-latching-relays/0548022/ > But I paid £10 for it from eBay, with a screw-terminal base included. > > It is _not_ rated to switch 300V DC, so I just ensure it is never > asked to switch when there is 300V across it. Or, in fact, more than > 5V.
Is it big enough to not weld closed forever? Anyway, I just picked up a 250 Ohm 250 watt resistor and a 120v primary, 6.3 volt ct tranny on fleabay. That should get the recovery time under 2 minutes I'd think. And that resistor shouldn't do anything but warm the garage 50 watts worth even if the SSR doesn't recover. :) 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
