RobotStudio event

Conveyor tracking speed

I am currently on RS 4.0 build 2461. I am using paint power pac. However when I run the program with conveyor tracking, conveyor is faster than the speed i set in the power pac. I set a speed of 9 mm/s in power pac but the conveyor wants to run at 33 mm/s. I have blocked the C1speed signal in the teach pendant. Does anyone have this problem and know what to do to fix this. Any help is appreciated. Thanks