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Thank you very much for your help. Your description provided the solution!
Unfortunately, during testing yesterday, we blew out one of the outputs. I have already ordered a new optocoupler. I also have a second inverter, but it has a fault at the encoder input, as the signal is not being detected. I installed this circuit board and on that board, the output switches correctly as well.

Perhaps someone here is familiar with the Yaskawa board. There must be a defective component somewhere on the board preventing the encoder signal from being processed. The encoder input is connector 2CN.

Damn, he is good!
Him and Luis should visit the senate, i would love to see Luis say "f@k you" to senate members, some bloody well deserve it.

Some more info.

Stell direkt eine Anfrage der Support ist sehr hilfreich.
Und relays:
Ich würde da was von Pilz nehmen 

I got completely turned around looking at those pics the first time.  I thought the surface you were resting the belt on was actually the pulley teeth in mesh with the belt.

Duh.

The dark line in the middle of the tooth is just the last bit that still has the original surface, with a bit of dirt that makes it darker. On both sides, it is mostly obliterated. I assume that is what you mean by “tit.”

And I think the gap between the teeth is also to reduce the smallest possible bending angle, in addition to the reasons you listed.

Is that supposed to be a T5 belt profile?  I've never seen a timing pulley with a 'tit' on the tooth crest.

Is the tit on the pulley teeth from wear, or is it some substance that got in the belt tooth valley groove and stuck to the teeth? And that's what you're cleaning?

To clarify, here's a T5 belt profile from Misumi.  I think the groove is there to help air escape at higher speeds (noise reduction).

 

Bei Amazon hätte ich nicht geschaut  . 

Motor, gefunden bei amazon. (Bei Stepperonline sind sie gerade nicht lieferbar.) 
Encoderkabel mit Batteriekasten, bei stepperonline, sonst nicht gefunden. 
Netzfilter FN2090-8-6, bei ehbshop.de
Das mit dem Relais bereitet mir noch Probleme. Ich weiß nicht, welches ich genau benötige. 

I finally found the problem with the threading. Should have found it much earlier.It’s the belt.

It gets chewed up. Opening the side panel, I found belt-colored dust, but the belt still locked fine, at least from the side. Looking closer showed that the teeth are broken up from the middle outward (see picture).
I found one tooth gap with some hard thing in it, so I assume that my initial cleaning when installing the belt was not very thorough and I overlooked that.
After cleaning that out and reinstalling the already damaged belt, I could thread fine. But I think this will not last long, so I ordered new belts and will install them after VERY thoroughly cleaning both pulleys.
It’s really typical for me that the solution to a month of problems is: “You should have cleaned the thing better.”

Wenn du bei Amazon bestellst, geht's schnell aber kein STO.
Wenn du direkt bei Stepperonline bestellst, freu dich auf den Zoll.

I did that; I installed the latest version of LNC from buildbot2.highlab.com/debian/bookworm master, and the problems persist. To execute a command with an external button, MDI must first be selected, which doesn't happen with the buttons on the screen. Regarding running O Word, both with external buttons and those on the screen, it now appears that the O Word file path cannot be found, and the error "Error Oword XXXX.ngc path not found" and "File not open" appear. And when executed manually from MDI, the error is "File not open."

Das ist ja genial! Direkt für alle Treiber den richtigen Filter. Ich habe es direkt ausgedruckt und an die Wand gepinnt. DANKE dafür!  Ok, das mit der Bremse habe ich soweit verstanden, bzw. den Generator. Du sprichst immer von Lasten wie Fahrstühlen, die sind ja echt schwer und haben ordentlich Masse. Ich plane erst einmal damit zu spielen, das Teil überhaupt zum Laufen zu bekommen, und dann einzelne Achsen aus meiner Musteranlage (nahezu lastfrei) anzutreiben, um zu sehen, welche Kraft in den Linearführungen etc. entsteht. Das wird ein spannendes Projekt. Nur sind die Teile wahrscheinlich nicht alle rechtzeitig zu meinem Urlaub da.   

yes, that will be the stable release when there is a stable release, but currently we are not promoting one because develop version is still early testing. bear in mind that even the develop version is currently still a development version and will have a very turbulent update schedule as we find bugs and correct them from the pyside6 porting.

Chris

Have you tried the command line?

After sudo apt update I started getting errors in real time (the old song in a new voice ) I tried many things and finally this helped: sudo apt install iproute2   
sudo tc qdisc replace dev enol root pfifo_fast