amberwolf wrote: ↑Feb 12 2018 3:29amIt doesnt cause shoot thru within a *single* controller--it would be from one controller into the other. If the top leg of any phase of controller A was turned on, and the bottom leg of the same phase of controller B was turned on, (however unlikely it might be to happen) and they are in parallel at the same battery and the same motor's phase connections, you now have a direct short from battery positive to battery negative, with only the FETs and the wires from the FET outputs to each other in the way.
And that's the paragraph that finally penetrates.
I've been thinking that the only difference was the presence of the other controllers output at the output of this controller; and not considering how that output gets there. Ie. Trying to consider the two controllers in isolation other than the paralleled outputs, and not considering that they effectively become a single large circuit.
We've been here before So once again, thank you for sticking with me.