EL4031 setup for VFD

Suppose you have a spindle that takes a 0..10V input to control the spindle RPM. The maximum RPM is 25,000 RPM, but it loses torque as the speed slows and doesn't support anything below 5,000 RPM, which happens at 2V. To disable the spindle entirely, the voltage needs to be turned off (set to 0V).To accomplish this set and . This should result in being able to set directly:If , then . Then , so , which is the largest value allowed, which will result in the hardware sending 10V. Any attempt to set RPM higher will just be capped at 25000.If (which is below the 5,000 RPM limit mentioned above), then . Then . This is less than , so it will be bumped up to . That will result in a value of , which should result in around 2V, which will give 5,000 RPM.To disable the spindle entirely, instead of setting RPM=0, just set to . That will drop the output to 0V.