I checked :
- halui.spindle.0.is-on: commute correctly from true and false when I press button
- spindle-enable: true false OK
- spindle-at-speed: true OK
Grounding spindle isn't impossible regarding instruction from supplier.
VFD is normally grounded via mesa card??
Interference sound good because mesa and VFD are in the same box. Probably something to improve.
After some test, issue appear when I try to launch spindle manually (with button). If I launch gcode without spindle, I stop and then I launch again with spindle, that works.
Probably something between interference and/or manual command.
Another thing is that I use LinuxCNC installed onto Mint19.3 with:
=11.5ptlinux-image-4.9.0-13-rt-amd64_4.9.228-1_amd64.deb
buster 2.8-rtpreempt
my version is 2.8.2-89
This is not version from debian.