PathPilot + Mesa 7i76e + DYN4 Servo Drive - Spindle not working

I'm running PP 2.7.2 with a Mesa 7i76e, and DMM DYN4 for a servo spindle which I'm trying to run in analog velocity mode. I'm confident I have the 7i76e<->DYN4 wiring correct, and have 10vdc across the 7i76e TB4 SPINDLE+ and SPINDLE-. I can run the spindle with an external 0-10v pot, so I am confident I have the DYN4 set up correctly. Halshow shows hm2_7i76e.0.7i76.0.0.spinena, spindir, and spinout with appropriate values. Everything seems correct, but I can't get voltage out on 7i76e TB4 SPINDLEOUT.

If anyone has PP working with analog spindle control on a 7i76e could I get a copy of your .ini and .hal files? If not, I'd appreciate if someone could take a look at my attached config files and give me suggestions where this is breaking.

Thank You.

I think that the 7i76e spindle output is a digital potentiometer (in effect) so needs the +10 and 0V references from the drive connecting too.

Yes, it is a potentiometer. The 7i76e and DYN4 are wired and powered per the attached. There is 10v between TB4 pins 1 & 3, but no voltage out on pin 2 when spindle commands are given.

Thanks.

Can you post the results of

halcmd show all | grep spin

when LinuxCNC/Pathpilot is running and setup for spindle motion

Attached is the output from "halcmd show all | grep spin".  Pathpilot was running and I'd just issued "M3 S2000" MDI command.

Thanks!

Yeah, if you do not have a watchdog error, and you have ~10V between
TB4 pins 3 and 1 and you do not have about 4V on TB4 pin 2 relative
to TB4 pin 1, It likely the 7I76E has a bad/damaged analog output

(you might check with TB4 pin 2 disconnected to make sure there is not a wiring error)