spindle doesn’t work

I tried your recommendation, but wasn't working. After several try and error I'm now able to turn on/off the spindle by LINUXCNC. The wiring looks like this

Mesa <=> VFD
Dir + +12V
Dir - FWD
En +
En -
nc
SPI + +10V
SPI OP AVI
SPI - COM

The next challenge is the spindle speed adaption. At the moment is only full speed possible. I've added the following to my INI and HAL files (not sure if it makes sense)

INI
MAX_OUTPUT = 20000
OUTPUT_MIN_LIMIT = 6000
OUTPUT_MAX_LIMIT = 20000
OUTPUT_SCALE = 100

HAL
net spindle-cw => hm2_7i76e.0.7i76.0.0.spindir
#net spindle-ccw => hm2_7i96s.0.ssr.00.out-01
net spindle-enable => hm2_7i76e.0.7i76.0.0.spinena
net spindle-vel-cmd-rpm => hm2_7i76e.0.7i76.0.0.spinout

setp hm2_7i76e.0.7i76.0.0.spinout-scalemax [SPINDLE_0]MAX_OUTPUT

sets spindle-at-speed true

setp hm2_7i76e.0.7i76.0.0.spinout-minlim [SPINDLE_0]OUTPUT_MIN_LIMIT
setp hm2_7i76e.0.7i76.0.0.spinout-maxlim [SPINDLE_0]OUTPUT_MAX_LIMIT
setp hm2_7i76e.0.7i76.0.0.spinout-scalemax [SPINDLE_0]OUTPUT_SCALE

have you checked if 'hm2_7i76e.0.7i76.0.0.spinout' changes it's value when the spindle speed is changed with hm2_7i76e.0.7i76.0.0.spinout = true?

If that is the case then you would need a voltmeter to check the voltage on the VFD 'AVI' input.

good news. It works as it should. I had the swap the REV with FWD to have the right spindle rotation. The speed control was fixed since I removed a miss misconfigured value in the HAL.

Many thanks for the quick and professional support.