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Invert the enable pin in StepConf.
You can edit the existing config, click on the right side where you have chosen that pin.

Sorry, failed to sort out the links carrying on into the text.

Gates Belt Tension Calculator
Gates 'phone Frequency App

So from the type of belt, length, number of teeth on the pulley, motor speed and power etc, Gates recommend tensioning to a twang frequency between 39-41Hz.
At this tension, the thing sings pretty loud with the covers off, but is far less sensitive to oscillations. Have P of 0.45, and I increased to 0.015 
With output scale at 4500.
Get
cmd   actual
  300   400
  400   420
  500   500
  600   600
  700   700
1000  1000
1500   1400
2000   1900
2500   2400
3000   2800
3500   3300

Have also now looked at the motor speed with zero volts to the VFD and its 250 (Hurco book says 150, but for now its in the ball park).
The rest of the low end volts looks like this.


 

Hallo, ich habe Die gleiche Maschine wie Du gekauft. wie weit bist Du mit Deinem Umbau? Welche Servos hast Du schlussendlich verbaut? Woher kommst Du?
Viele Grüße  Markus vom Bodensee 88636