I sketched the following schematic from a motor controller board that has to be operated at 220V from L1 to L2. The earth wire is connected to the chassis of the machine.
Where I live, it's common to see ground and neutral at the same point for 110V machines.
My 220V connection has 3 wires: L1, L2, and neutral (not ground.)
That is, from L1/L2 to neutral I have 110V. What if I connect the earth point of the motor controller to the neutral point of my 220V outlet? I would have 110V between L1/L2 and earth and that means the neutral would be attached to the chassis. In this case, as I do not have ground on my 220V outlet, should I disconnect the chassis from the neutral?