where the VESC power simultaneously ?
And was the Can Cable connected?
CAN cable was connected, by accident I got my Y switch disconnected from VESC’s because battery fell off so I plugged one by one with like 5s delay and nothing happened 
Guess you’re lucky… Unlike most people.
I still DO NOT RECOMMEND to plug your vesc not simultaneously if the can cable is connected.
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hmmm if only i knew this. time to buy SN65HVD232