Hi Javier - Just to let you know that AriCAD software is tool for the manufacture which is very basic and I do not relay of its results, Bentley Hammer is much more sophisticated and advanced in terms of hammer analysis and result.
As Jesse suggested the best place is here to solve your problem, do not hesitated to contact the Bentley Technical support and also you can share your model here as well (zip and attached .wtg and mdb files).
Regards.........Mohamad