The weight of shafts and additional masses is considered in the calculation if this option is set.
The 
-button next to the weight checkbox allows the definition of global accelerations for the three axes. The accelerations are also available within the definition of a load spectrum.
The weight is already considered by setting the flag “Consider weight”. It does not have to be entered as acceleration. The input for accelerations is thought for additional accelerations like in gearboxes in vehicles.
