We're trying to setup rotary phase converter, and we're getting some differences in line voltage. The black reads 350 to ground while red and white read 120 to ground. This is all from a 220 input. Red to white reads at 240 volts. Any thoughts on the problem? I don't imagine this is normal.
If your rotary phase converter's output is wired for high-leg delta
then I'll present the following as a possibility.
However, if your phase converter is internally miswired like this:
then your result could look something like this instead:
and your measurements would be something like L1 & L2 = 120V, L3 = 317V.
So - not the 350V you're seeing, but maybe a possibility?