Kirk Wallace wrote: > For this relay: > > http://document.sharpsma.com/files/s108t01_e.pdf > > what does "Non-zero crossing functionary" mean? > I'm pretty sure it means that the Triac will fire as soon as the LED lights up, regardless of where that is in the AC line cycle. A zero-crossing SSR will wait until the AC voltage across the Triac is about to cross zero before it turns on. Waiting for a zero-crossing tends to reduce electrical noise and possibly stress on the Triac and/or the load (depends on the nature of the load).
Regardless of the type of turn-on, once the Triac is on, it won't turn off until the current through it goes to zero - even if the LED is off. That's why SSRs only work for AC - in a DC circuit the current won't go to zero. Hope this helps, John Kasunich ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
