I have one ambiguity regarding grounding.
I have system in which power supply and CPU board is there.In CPU board there is stepper motor driver and display and other circuit is there.Supply for stepper motor is different from controller.
I had not merged Stepper motor driver ground to any ground on CPU.Stepper motor ground in grounded on Power supply board through inductor.
Is it correct or some different approch i should take
Please give me suggestion with some reference documents .
If the power supply of the digital part is different from the power supply of the motor and you are not using optos, then you have to connect both grounds together. The best place to connect it's a the stepper motor ground point. Try to avoid grounding loops and take care of the high current paths.