Schaublin 125-CNC retrofit.

I had a quick look at the config files in the first thread. However, I do think it would be good with the latest files, as well as the classicladder part.

In addition to what I mentioned in the last post, I would also say you should have a look at these signals when you issue an M3 command:
If the physical buttons are not connected to (only) LinuxCNC, then I guess it could very well be something on the hardware side as well. In that case some kind of schematic would also be needed for "remote" troubleshooting.

Thanks. I fixed it. I think it was a combination of sometimes doing M3 without an Sxx first on start up, then pressing the button (which defaults to S200) and then trying S100 M3 in the MDI.
Turns out I got the Analog 0-10V and GND wires reversed when I rewired the VFD.

The weird thing was with those wire reversed, it would not start the spindle below S175, but would only run the VFD at the max frequency with any S speed above that. So switch on, type M3 nothing, push button (= S200 worked but always at 70 Hz),  then I had been typing S100 M3, and it would not start. 

Switched the polarity, and now it is all back to normal.

I'll upload the latest HAL and Ini to the first posts a bit later, as it is good to have a back up here.

That is quite interesting behavior by the VFD. If you have a "single ended" output (say 0...10V -> 0...70Hz), you would think that with the wires reversed, it would go to minimum allowed frequency or just refuse to start.

Anyway, glad you got it working.