If you disable a script then it won’t change the values of the Conveyor.
Try just setting the Conveyor.Velocity value to (0,0,0) instead to shut it off.
Take the script out of the Conveyor.
Use the velocity line you have in the Conveyor’s script and put it in your ‘on’ section of script.
Use the same line but change the velocity to (0,0,0) for the ‘off’ section of script.