@SDJ Yes, it has to run in between 1400 and 2000 RPM which is very slow but for a super short duration (a couple of seconds really) which is not doing much to the spindle, it only has the time to get up to speed.
I currently have a 1.5kW air cooled spindle but I'm in the process of moving to a 2.2kW water cooled one. As I'm going from ER11 to ER20 my current ATC will be for sale as soon as the nice guys at RapidChangeATC send me the ER20 version I just ordered...
(Hehe, yes I have a very inquisitive kid that also doesn't like to follow instructions, he lightly cut the tip of a finger on a sharp router bit right after I told him explicitly, multiple times, not to touch it ;-). Also, he has 3 brothers 😅)