Since I recently had a stepper motor driver die on one of our VP-2800HP-CL64-4R machines I had to replace it with a new stepper driver.

I have replaced it and everything seems to be working fine, but I'm now paying more attention to how hot the z-axis rotation (nozzle rotation) motors are getting. From what I could find online, most people tune their stepper motor current with a voltage measurement from the potentiometer to ground. After unbolting and taking the cover off of one of the still functioning nozzle heads I saw a voltage of about 0.275V from ground to the diode shown in the photo (it's trace runs to the potentiometer). So I set the replacement stepper driver to have this same voltage. The setting seems decent with a strong rotational control and no jittering. However, I'm a bit concerned that the motor is warmer than maybe it should be.

Do you have a better recommendation for how to tune the stepper drivers?

Thanks in advance. -John

IMG_0119.jpg - Bild entfernt (keine Rechte)

Thanks for the info Michael! I'll go back and measure the current instead.

Hi Michael,

Could you give more details on how we should be measuring the driver current? The method we have tried so far is by measuring the current going into the drivers. However, we see a current of around 0.08A.

Could you be more specific of where the current is measured and under what conditions we should see 0.6A?

Thanks