Earlier I asked if any one had some data on a Motorola part "SAC722" and I have not had any response to it, however, I think I now have it all under the hood.
These units appear to be TRIACs, and there are two of them in series, maybe for redundancy? Any way, there is a REED contact envelope in there with a couple of turns on it that monitors an 1/2 HP AC capacitor start motor.
What this does apparently is when current is high, it closes the switch, turns on these two TRIACS which connects the starting cap. When motor RPM's are up a bit, current drops back and the REED switch opens, thus, disconnecting the starting cap.
This is a neat little trick so not to worry about a centrifugal switch in the motor, and hard to access capacitors however, this unit failed while being operating on a Honda Generator? personally, I think it could of been low voltage? The water pump may be been doing a lot of restarts and there are no heat sink on the triacs.
What's your take on that? Do you think a low voltage event could of caused over heating on the triacs? I have not tested them for the 230 volt break down yet and gate trigger levels.
I was asked if I could come up with a better circuit that works more reliable because apparently, this unit is no longer made and the replacement kit does not work as well from what I under stand.
Jamie