Mesa 5i25 & 7i76 to GE Af-300 VFD?

I did use the Sxxxx along with M3 and M4. No trouble at all using the MDI panel commands, and the spindle is happy to run in either direction I choose. Switching over to the Manual Control panel is another story. Pressing F10, the spindle runs CCW at maximum RPM. Press F9 and it sits there motionless. In both cases before starting the spindle, the spindle brake has a check in it's box and the stop is depressed in the Manual Control panel. When either F9 or F10 is pressed the spindle brake box becomes unchecked, the stop button is no longer depressed, and the appropriate CW or CCW icon changes to depressed. This is as expected. I do not yet have the physical components of the spindle brake connected yet (relay & air supply). Anyone else encounter this?

-Mike

What happens when you press F9 and then F12 several times ?

According to this Wiki wiki.linuxcnc.org/cgi-bin/wiki.pl?Keyboard_Shortcuts F9 and F10 are toggle soft switches. Have you tried F9 ON F9 OFF followed by F10?

I know how the F9 and F10 are supposed to work. This machine ran on earlier versions of linuxcnc and used to be controlled with a CNC4PC C11-G parallel port breakout card. I'm loving the Mesa cards so far, but have encountered weird problems -- which seems to be my norm. I'm at the point in the wiring and configuration where I'd be comfortable to back up the configs and do a wipe and reload. I do appreciate the help and suggestions --you guys are great!

-Mike

Did you ever get this figured out? I'm getting ready to write mine up and have been researching for a solution, think I found a good reference from a fellow boarder, below is the explanation in a wiring diagram. Looks as if it's creating a safety circuit using the enable and direction outputs and two relays.

It's not a safety circuit as such, that is how to control a VFD with separate FWD and REV inputs with the 7i776 (Which has ON and DIR) outputs.