Kind of confusing post. But conventional operations requires variable track voltage. That is provided by V1 and V2. It is also broadcasting a DCS signal unless you turn it off, but the max voltage is what you set running conventional. So while doable not necessarily practical. You could even run conventional off F1 and F2 if you had a variable input power supply. But why?
Lastly the TIU get power from F1 only or Aux input. So to have control over the TIU you need to have power to it. Can't just power V1, the TIU would not come on.
So most folks probably have a dedicated loop for conventional engines they like to run. Or do a quick reconfiguration of having TIU V1 or 2 go out to the loop they want to run conventional. Really depends on the size of your layout. G
