I’ve had my VFD running my spindle with manual speed control (panel potentiometer) for a while with no issue. I thought it would be useful to control the spindle speed using my Centroid Acorn controller 0-10V output.
But, the speed fluctuates randomly and won’t go higher than about 20%. I’ve attached a video showing the behavior at 18,000 RPM (max) setting on the controller. Connections are per the attached diagram from Centroid.
VFD is a Simphoenix E500 running an HQD 2.2kW spindle. I bought the hardware from https://www.automationtechnologiesinc.com/ and they have been helpful in verifying all VFD settings. The issue doesn’t seem to be with the Acorn, I have measured a steady 10.2V output at full RPM setting.
https://youtu.be/ZFFpzz1X8Vw