pm-30mv spindle control

[smoke signals]

Here is the situation guys, I have a precision Matthews pm-30mv. I would like to keep the factory motor (for now) and control it with acorn using the relays for forward and reverse. Also for the rpm my understanding is the potentiometer is roughly 0-5v. I have noticed in the wizard there is a setting called "limit spindle analog output to 0-5 volts" can i use this to control rpm? I could not find any videos or posts saying yes or no. thanks

[centroid467]

Hello,

Yes, you can use the relays to control the spindle direction.
Acorn is capable of using 0-10 or 0-5 volts analog signals to control spindle RPM. Most VFDs are able to use this signal so it is likely that you can replace the potentiometer with the Acorn's analog output.

[smoke signals]

Thank you for the response. That Is what I was thinking but watching franco's video of him using a kbsi-240D makes me think I may need a interface between the two systems to isolator them from each other. I think the 0-5v is taken care of by the wizard. So the only other question is do I need a way to isolate. I also found pm machining and seeing him cook some of his components makes me pause and think should this be done. I know mp machining is using different hardware and software, but I need to ask to feel more comfortable. If you read the comments in his video it seams his problem has been fixed by using a separate power supply. I am not against doing any extra work however I like to keep things as simple as possible.