Scott,
don't mean to be nettlesome, but you promised a theory discussion on this back in august of 01 when you posted the diagram and I can't find that it ever happened, but I get no returns on searches I'm sure ought to yield something, so maybe I'm just not searching right.
In any event, after dwelling on the drawing - which is a little more complete than the diagram inside the cover of the contactor, it seems to me that the point of the 3-wire switch is that if the tool/machine happens to be turned off from a remote location or not at the last switch toward the machine, it will not start when re-energized even if it had been running.
I have to say that the pattern confused me at first, esp because there was nothing left of the original switch which got crushed by a forklift during moving.
To file under almost arcane knowledge, is there some other functional advantage I'm not considering to this momentary NC / NO paired switch?
thanks,
brian
