Thanks for taking a swing at that. One thing we can all agree on is that the manual is dogshit

Feeding dogshit into AI seems to result in a similar result as when I used to mow over the dried up dog turds on the lawn when I was a kid.
This is an old 8214. Specifically EVF81214-E
The VFD doesn't have a built in brake chopper. There are two options, either a "Brake module" with an integrated resister, or a "Brake chopper" which feeds an external resister.
I first bought the external resister due to lack of understanding / research.
.. .before I worked out it does not connect directly to the VFD.
Then I bought the "Brake module" EMB 8252-E, which connects to the UG+ and UG - pins.
adegis.com/media/asset/6e4b8a95789dbed2a...ed149b4af51f912d.pdf
They are connected correctly.
However, that is not the issue. If you look in that video I linked a couple of message further above, at that point in the video, you can see the VFD oscillating back and forth into overcurrent as it tries to brake the spindle motor, without any form of resister added.
Back then, I somehow found out how to set the VFD into a coast down mode. That must have happed just after I made that video.
When I hit the spindle stop, the VFD switches straight to "off", and current drops to zero, no attempt at decelleration, no over current. That is how I operated it for the last couple of years.
Before I even connected the brake module, I tried to return the VFD from "coast down" mode to normal brake (which would mean overcurrent without the brake module installed), and failed.
I can see two explanations.
1/ I was informed of, or stumbled onto a parameter setting, or combination of them to set the VFD to coast down. So it no longer follows the C13 deceleration setting, it just disconnects from the motor, and leaves it to coast down. Now I can't find that setting, nor remember what I did.
2/ I blew something in that VFD which was responsible for decelleration current. But there are no other symtoms of anything blown in this drive. It works perfectly, and gives no errors.
Cheers,
Mark