Gene, One detail. Is the breaker only tripping when you turn OFF the SSR? If so, this actually makes a lot of sense. Some SSRs have a self-protective function that turns the SSR on for a half-cycle if an overvoltage is experienced. (This is usually an avalanche section built into the SCR or Triac component.) If this gets triggered on shutoff of the transformer due to leakage inductance in the primary winding, it could get stuck in this mode until the breaker pops. You might be able to fix it by putting a big snubber across the SSR. Since the direct-feed SSR has a beefy resistor across it, it seems like it might be the SSR that is turned on first that would be susceptible to this mode. But, you might try it on both - or put it spanning BOTH SSRs. Something like .01 uF and 10 Ohms in series might be where to start.
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
