Originally Posted by
rschwarz
Most spindle drives have an analog input (0-10v) to control the spindle speed. (Vso,Vi,Agnd)
I see people connect the ground from their breakout board (digital GND) to the ground of the spindle drive (analog ground).
Is that correct? Aren't these different ground planes?
For digital circuits we use ooto couplers to isolate them. How is the 0-10v analog input of the VFD isolated from the breakout board?
How does the analog input circuit of the VFD look like ?
Thank you.