Hey Olan,
maybe it’s a 0.8 kW spindle.
Anyway for a 24,000 rpm cheap chinese spindle, setting “Rated number of poles (PD143)” to “2” and “Rated Motor Revolution (PD144)” to “3000” should be correct, as explained here. With this you should get the spindle spinning at the right speed (24,000 rpm at 400 Hz).