[lammps-users] Tip3 with/without kspace ?

I used the tip3 with and without kspace( pppm) . In this case the lj values for H are not zero, and i am getting negative values for both energy and pressure before minimization… But when i used kspace i am getting positive values for energy and prrssure before minimization.
What should i go through. Tip3 with or without kspace?