Load flow and machine initialization are not working

Hi,

In this below example,

https://www.mathworks.com/help/physmod/sps/ug/emergency-diesel-generator-and-asynchronous-motor.html

I tried to change the nominal secondary voltage of transformer to 240V , but the system failed to initialse using machine initialisation tool and load flow. what modification i need to do with transformer paramter settings

Please advice