On 02/02/2016 09:05 PM, Gene Heskett wrote: > > I don't hear it, but since they are toroids on ferrite cores, would I > hear that? They are very quiet otherwise. Your power transformers are Ferrite? Are you sure? If these are Hammond toroids, they are wound up with a steel strip. I can't imagine running a power supply at 60 Hz with a ferrite transformer. >> If the transformer is fed >> half-wave power, the core will saturate in barely more than >> one line cycle, and a tripped breaker seems quite likely. >> Zero-crossing SSRs are really NOT good for transformers, >> anyway, as they just about guarantee a saturated start for >> the transformer, anyway. What you REALLY want is a relay >> that always closes on the voltage peak, but they don't make >> those. > Noted previously. And it hurts. I think that may be some fraction of the > why I had to put a 30 amp breaker on that circuit in the first place. > > Bears investigating for sure, thanks Jon. > >> Anyway, it seems my idea would require only moving a couple >> wires, so you might try it. >> >> Jon >> > I think that is what I have, but possibly not, Jon. It wouldn't be at > all hard to fix in the event its not that way. But again, it runs all > day, then trips the breaker coincident with ther button click, seconds > BEFORE either SSR is turned off. Thats what doesn't grok. Weirdsville. > > Ahh, BEFORE the SSR is turned off. Now, THAT is interesting! I wonder if there is something that is fouling up the load side of the supply, like turning on BOTH the forward and reverse relays at the same time, or something crazy like that. Maybe the way the logic is set up the E-stop condition is different from the "turn it off" condition. Whatever the outputs do for E-stop should be the same as Off. But, maybe there is a momentary bobble on the commands to the SSRs when you click the button. I'm guessing that means the E-stop button here.
Jon ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
