question

Terminators are used with VE.Can not with VE.Bus.
If the unit reacts different after using the terminator in the VE.Bus you can conclude that it most likely harmed the VE.Bus.
The best thing you can do is return the unit to your dealer so they can check it.

Regards,

Mark

According to Victron, this is due to the incorrectly connected minus cable of the battery. The minus cables must always remain connected under the 3 devices. If this is not the case, the VE.bus will be damaged.

Hello @s.rauber@solarmarkt.ch,

You did not mention that you had anything done with the DC power cables, but it is correct that removing the minus from a unit coupled to another unit via VE.Bus will fry the VE.Bus.
This is because of the VE.Bus is not isolated from the systems minus.
So is you remove the negative connection the unit tries to power itself over the minus supplied by the VE.Bus.
This circuitry can obvious not handle the amount of power that the unit needs so the VE.Bus wil be destroyed.
Ans as you have noticed, for normal (stand alone) working there is no need for the VE.Bus to work, but connecting to the unit or using it in a multiple installation needs a working VE.Bus.

Regards,

Mark