Sometimes calculation may fail while the user cannot easily identify why. The reason for calculation failure may be an unsuitable number of iterations set for the particular case. By default, the number of iterations is set at 50. However, for some more complex or numerically sensitive calculations, the default value of 50 iterations may not be enough.  In this case, increasing the maximum number of iterations to the maximum value of 5000 allows the calculation to complete successfully.

The maximum number of iterations can be changed in Options | Calculation.

The calculation fails with the message “Failed to converge after 50 iterations” in the output file.