Hi,
Well ive had a re-think, and this offering should be ok, so long as the caps are not too big. They have to be big enough to operate the four position relay, but not so big that they might damage the other contacts in the
event that the press button or the light driven contacts were to close. Maybe a bleed resistor would help, or maybe a low value in line with the button and light contacts.
************
Arrangements like this are almost certain to need some sort of over-ride button, cos curtains can get stuck, or jam very easily. Some kind of cut-out on the motor would be needed too.
************
I am wondering if the un-used contacts could be used to stop any over-run by wiring them as a motor short, but i dont think that over-run is likely to be a problem.
************
At a guess, i would say that a cap of about 1000 MFD (@ 12v) would be as big as i would care to short with ordinary contacts. In normal use, it would be unlikely to have to operate quickly enough for most electrolytics to retain much of a charge anyway. I would hope that two or three hundred MFDs would be enough to operate the four position relay.
If this assembly runs at a higher voltage then the caps would be lower values and definately want bleeds.
************
Better still, use a completely different approach to the relay circuitry, as shown earlier in this thread.
A four position latching relay is not how most people would make this arrangement.
***********
Best of luck with it, John