Do You use Fronius power source?
I have the same issue, in old TPS and earlier TPSi firmware - if You use two signal at the same time -, xmwire function forces it (- wire inching and touch sensing - ) Fronius firmware gives no voltage on wire...
For me the solution was to write own function using XAC command - I'm going towards the "Z" axis from the tool direction, if the height is OK - I'm going to weld, if the height is NO OK - going to the cleaning station and cut the wire to the desired height.
If anyone has a better solution, I would be grateful for the idea.