from my working notes:
added load, got convergence error. (surprising because there's no feedback and ground is capacitor-coupled.) will add relays... relays insufficient! they change, then the convergence error happens. ah: relays *and* capacitor-coupled ground required, but after start, you need to close the ground switch for proper operation.
strange, eh? :)
here's how i worked around it:
http://everycircuit.com/circuit/5849502430003200
note the ground relay has higher inductance and a separate power supply than the other two. ignore the working notes.
