Oh dear, hopefully I didn´t ruin the Siemens. I thought a quality product would have protection against poor settings. I have been poking them but honestly the user interface is quite complicated, and the terminology too for a non-technician, even with the better operating panel (Advanced OP, if I remember the name correctly).
4147-B-DB-P-ER20-RH looks like my unit, allthough this might be newer. Specs are the same.
Wiring is made again, as simple as possible (for this test purpose), hard to believe the problem would be there. Will take photos next week, when getting to the workshop.
The el Cheapo VFD is a brandless piece of s***, this one:
https://www.amazon.es/gp/product/B07...?ie=UTF8&psc=1
Hope to get the Siemens back in the game.