http://www.wolframalpha.com/input/?i=plot+297*sin%28x%29+and+plot+%28297*sin%28x%2B0.66pi%29%29++and+%28297*sin%28x%2B1.333*pi%29%29
three 210vac phases
plot 297*sin(x) and plot (297*sin(x+0.66pi)) and (297*sin(x+1.333*pi))
two legs of a three-phase 210vac, and the sum of them:
plot 297*sin(x) and plot (297*sin(x+0.66pi)) and plot (297*sin(x) plus (297*sin(x+0.66pi)))
correct current through fourth 470k resistor
plot (297*sin(x)/470000)
omni has 246 vac
robot wants 200-220 vac