Hi I have a Huanyang VFD 110V air cooled 1.5KW spindle with a 400hz and 24000 rpm. Out of the box it seems that all of the appropriate settings are preset correctly. I wired it up and it came on and spun up to 24000 rpms per the display without issue. I built a manual spindle controller and have it wired per attached drawing. I have the VFD setting changes listed as well. My issue is it powered on and the controller worked, but I am maxing out at about 11500 rpms, no where close to 24000 rpms. Is there a setting that I am overlooking that is effecting the rpm output??