Does it make sens to buy vector controlled VFD for 350$ instead of u/f controlled for 250$?
I found this was a problem only after I bought the gear, it seems the ABB ACS355 can not control my ELTE spindle (2.2kw 24000 rpm 400hz) in vector mode. I use the same inverter on another machine that has a standard 2.2kw induction motor and it works in vector mode for that without problem. You therefore need to read the manual for the VFD to see if it can handle your spindle.