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Big Thank You to Steve, this is now sorted. For some reason the high speed was set to 9000, I've reset it to 1000 and everything works perfectly.

Hi Folks, I bought the pre built/tested unit and keyboard. I've built it and connected it to a TB6600 driver a 200 step nema 23(2.8A) motor, my table is a vertex HE4 90-1 ratio.
Everything works...