Stop collisions on certain frames

[aqualonix]

Hello everyone!
I have this setup:
Hairs with 2 material ids, first id follows character head, second is in simulation.
I want to stop hair collisions with character on frames 75-95, however I cant manage to achieve it.
I can enable exclusion from first to another frame, but not from second to another.
If i set exclusion from second frame collisions still occur. 
What am I doing wrong?
   

[tyFlow]

From your screenshot, it looks like you should be applying the exclusion to the Collision operator itself, not the Send Out operator.