Hi Muzzer, my instinct was correct then, I haven't connected the Resistor to the DC+ and DC- so that's a good thing.

You say the R- should read 330v, so are those readings for the R+ and R- bad then the max it went to during Braking was 22vDC

I've had the Decel set on quite a few different settings during the test but I think it's 5 seconds at the moment, the quicker the better, so I could bring that down to 3 seconds maybe... I think I kept getting faults the last time I changed it too low, but 3 seconds might be ok...