I've set up my Openbuilds Blackbox to control my VFD and spindle. I've calibrated the 10V output from the openbuilds Blackbox. When I set the tool power to full its spot on at 24 000 RPM. But when the tool is off in Control the spindle twitches and rotates? The RPM is going from 20-80 RPM on the VFD display but the spindle rotates 1/4 of a turn then stops and rotates another 1/4 of a turn as if its getting a little bit of voltage from the Blackbox
Hi I set the min at 0 and max at 24000rpm. If the Blackbox is not turned on the spindle stays stationary. So I assume the Blackbox is outputting a small voltage when the tool is supposed to be off?
Normal noise on the line. Most people set a minimum of like 7200rpm (for air cooled). It doubles up at protecting your spindle against overheating by accidentally running below its minimum speed too
