Remora - ethernet NVEM / EC300 / EC500 cnc board

Thanks Murphy for your answer. I read the entire forum many times without finding what I was looking for.I used marked spindle index pin on the controller. From EC500 V5 documentation:

INDEX can be connected to ordinary NPN type 2 wire Hall switch  

So I tought maybe they didn't put or put better optocoupler on this one since this pin is intended for this use, if needed i'm gonna bypass it. So do think I should use te remora PRUencoder or use the linuxCNC encoder module ? And to do so , do I need to modify my config.txt file to include encoder and upload it again ? I really want this to work 

I m not sure, I haven't gotten as far as an index yet, I'm trying to get the A and B working right first. That uses the PRUencoder. The encoder only supports quadratic at the moment. I have the A and B pulses going to the WHA and WHB inputs from the MPG(by passing the opticouplers). I'm not sure if the index pin will have to be bypassed also.

Are you guys trying to bring the encoder phases into the EC300 board rather than using a closed loop stepper driver?

No just to have closed loop on a 0-10v VFD. In @Cakeslob examples , he just seem to use phase-z (INDEX) for his spindle control

vp, what are you trying to do and what is happening so far?

you just want a closed loop spindle? are you trying to thread or something else? is it only the z channel? most spindles are left open loop but with spindle feedback for rpm

The spindle run but doesn't look closed loop since the rpm is not right but I can vary the speed with the override.

lets start with this. what is the spindle speed? estimation/best guess,

this will get a little tricky because you have a pulley reduction and gear thing