Input ports (1, Action) If Action Subsystem' are involved in the loop?

I could see an algebraic loop formed in your model by the signal coming to Total_pressure_BP input of Pump 1 subsystem. This is actually causing the issue. Try adding a Unit Delay block to the signal coming to Total_pressure_BP block.

For more information about identification and removal of algebraic loops have a look at these links:

https://www.mathworks.com/help/simulink/ug/identify-algebraic-loops-in-your-model.html

https://www.mathworks.com/help/simulink/ug/remove-algebraic-loops.html

Also in order to solve algebraic loops in models containing continuous blocks you could go through this link:

https://blogs.mathworks.com/simulink/2015/07/18/why-you-should-never-break-an-algebraic-loop-with-with-a-memory-block/

Hope it helps!

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Satya Prakash 2021-10-7

Is there any other method to handle signals without adding delay block?

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