Originally Posted by
StefanoPrato
Hi,
Actually I unplugged it always when the VFD was not in run mode, I never unplugged it while running even if 0Hz. Also I solved the problem with the 25Hz thing: a disconnected jumper on the board. I noticed it when I gave a punch to the chassis of the VFD for frustration and the spindle started to spin, this made me understand that there was something "mechanical" not working well.
Now I still have to understand why in the first place the spindle stalled during operation; I don't really thing this is related to the jumper.
The only thing that come to my mind is that once for about 20 minutes the spindle worked with the water cooling radiator off and it was pretty hot but still touchable (water was hot but flowing).
Thanks for the reply.