The machine is an Hermle UWF851 (Deckel type of the 80's), with a TNC155 controller, it wasn't working when I bought it last year, the seller told me that the spindle motor 'probably didn't get a signal'.
I'm having a problem with the Siemens spindle drive of a machine I'm trying to repair, and I'm really running out of ideas, thank you for taking the time to have a look at it. It's been a while since I've been on the forum, sorry about that.