title: Simulink Integrator Error when Fixed-step size increased
body: <p>I downloaded a Simulink model, which I would like to run with a high fixed-step size, because I am more interested in speed than accuracy.</p>
  
  <p>ode3: Works until <code>Fixed-step size 3</code></p>
  
  <p>Everything over <code>Fixed-step size 4</code> leads to error.
  (Other solvers like ode8 lead to an error with other fixed-step sizes.)</p>
  
  <p>This is the error message:
  <code>Derivative of state '1' in block 'example_HeatPump/HeatPump/HeatPump_basic/model cold side/Integrator' at time 16.0 is not finite. The simulation will be stopped. There may be a singularity in the solution.  If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)</code> <a href="https://i.stack.imgur.com/ocsQn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ocsQn.png" alt="This is the block where the error occurs"></a></p>
  
  <p>Is there any way to solve this error?</p>