Also, even with the motor stopped, reversing it causes the 20 amp SP breaker to trip ? Before, & after the control was changed.
"That was an important piece of information, don't you think?"
-- Lieutenant J.G. Daniel Kaffee,
A Few Good Men Dnk, that controller has a 15A line fuse built in, but no output fuses. Since the 20A CB opened instead of the fuse, I'll guess a little further that the line and neutral are reversed somewhere.