Hi.
I wrote in Dymola a Modelica code:

equation 

  i_eneu=

    if (u_ist - u_soll <= 0) then (u_ist-L_e*der(i_e))/R_e

    else (U_f-L_e*der(i_e))/R_e;

For simulation I want to use DASSL Integration Algorithm. DASSL got variable integration steps, so I get this error:

 WARNING: You have many state events. It might be due to chattering.

Because the Integration steps get very very small. The simulation gets stuck.

With EULER as Integration Algorithm it works fine. (Euler=fixed Integration steps).

But I have to use DASSL. Can anyone help me with this?

thanks