8 amps at 240 is 1920 watts
If the induction motor is 80% efficient, and 80% power factor, then in order to get 2.2 KW of shaft power, you will have about 9 amps per phase at 220vac actual.
so that will draw about 2700 watts from your 240volt supply to the VFD.
if the 2.2KW is the input power to the vfd, then figure 75% of that gets into the cutting tool. (there is a reason its water cooled)