Maximum step size. The Max step size parameter controls the largest time step the solver can take. The default is determined from the start and stop times.
Hmax = (Tstop-Tstart)/50
Generally, the default maximum step size is sufficient. If you are concerned about the solver’s missing significant behavior, change the parameter to prevent the solver from taking too large a step. If the time span of the simulation is very long, the default step size might be too large for the solver to find the solution. Also, if your model contains periodic or nearly periodic behavior and you know the period, set the maximum step size to some fraction (such as 1/4) of that period.