Need help with a sensorless vector VFD and 2.2kw motor.

[EddyCurrent]

Did you read section 5.2.4 of the manual ?

It's strange how the trimpot works in v/f but does not seem to work in vector mode.
Also the motor speed is an issue. It appears that spindle motors are rated at the theoretical speed of 24000 rpm but this is not the actual speed, a thing called 'slip' has to be taken into account.
The manufacturers of my spindle say the slip is about 4% of full speed which works out at 23040 rpm (they said they used a figure of 23100) so this is the speed you should enter for parameter PB.04

[kajuk]

Did you read section 5.2.4 of the manual ?

Yes, this is what I follow when doing autotuning.

It's strange how the trimpot works in v/f but does not seem to work in vector mode.

The inverter kinda responds to the trimpot and increases/decreases frequency but the spindle doesn't follow it. Even if I set minimal allowed frequency to 400, the spindle doesn't want to know and still jerks around a few rpms.

Also the motor speed is an issue. It appears that spindle motors are rated at the theoretical speed of 24000 rpm but this is not the actual speed, a thing called 'slip' has to be taken into account.
The manufacturers of my spindle say the slip is about 4% of full speed which works out at 23040 rpm (they said they used a figure of 23100) so this is the speed you should enter for parameter PB.04

Do you think such a small difference may have an effect? Even when I tried your suggested settings (1.1kw/200Hz/12000rpm/110V/9.5A) it didn't make a much difference. I'll try anyway.