Teco VFD - Magic Smoke Leaks Out

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About 6 months in, I decided to remote the control head for the Teco VFD.  Ordered the cable and installed it.  Flipped the main switch and it went BOOM!  It took out a 30amp 220V breaker and my wife sitting in the opposite end of the house, with a hallway in between, heard it.  There was a bright flash as well.  Shear coincidence?....