I’ve had a look at your previous pictures and can see that the DSP Card is connected to the inverter so you should be able to control the spindle speed
When you run a program the spindle should start automatically and stop when the program has finished
If you look at the arrow on the picture blue LED’s should come on in sequence when you change speed ( all off = spindle off, first one on is 6000rpm, second is 9000, second and first is 12000, third is 15000, third and first is 18000, third and second is 21000, all three is 24000) this is how my machine worked
The potentiometer is for minor adjustments and the red led screen displays the inverter status (if you stall/overload the spindle it will cut power to it and display an error message) you should not have to change the settings for the invertors unless you fit a different spindle motor


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