Fixed Step error.

The Simulink model is running with varaible step and adabtive zero crossing.

I need to run the model in fixed step for various reasons.

But it always give me that error

An error occurred while running the simulation and the simulation was terminated

Caused by:

• Derivative of state '1' in block 'mpc4v4_trial/Reactor /Core Kientics/Integrator' at time 1.75 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)

1. Use the unit delay block / memory block.

OR

2. integrating with zero initial condition in integrator block try 0.0000001 instead.

OR

3. Try reducing fixed step size or make it auto

but also no use.

Can any body help me through this.

[Yasasvi Harish Kumar]

Hey,

I believe that the model might have a division by a small number at that time period. What you can try doing is reduce the error tolerance and see if it helps.

Regards