The wires on the machines tend to be labled L1 and L2 or L1 and N with a green/yellow striped ground wire that may be labeled "PE", In a 220VAC setup (in the US) we'll connect ground to the green/yellow striped wire and use two black wires from a 220v breaker for the other pair.
Do not run hot wires from two separate 110V breakers. This will not work.