Spindle not running - Need Help

[Doddy]

I'm cautious about offering any advice here, because I fear this could run and run and go nowhere, and you're rather too far away for me to eyeball.

Has the spindle operated in the past?, i.e. is this a newly developed problem, or not? - that'd help us to understand a starting point.

You show an image of the VFD commanding a forward rotation at 400Hz (typically 24k rpm for a 2-pole spindle) - but the spindle doesn't rotate?, that's an alarm bell to me - irrespective of the behaviour of the flashing light on the USB BoB - if the VFD is commanding rotation and the spindle isn't moving, I'd be worried about either the VFD or the spindle. However, I'd expect the VFD to display a fault in either case.

Edit: https://www.automationtechnologiesin...l-v1.17-EN.pdf looks to refer to a similar BoB, with a statement "Status indicator LED can be useful to show the USB connection, and working status by flashing."