Adding Load During runnig Simulation

Changing Load parameters during running simulation by knob block might not work as you desired though for removing load Ideal switches work.

Here by the aid of Ideal Switches and step block we remove the Secondry Load during Running simulation as an option for assessing circuit performance during the change in parameters which here is the removal of Load to see its affects on circuit current and voltage.

When Ideal switches gate signal is 0, the switch act as an open circuit (off_state) block and when the gate signal is one, the switch act as short circuit (On_state) . By the this feature of Ideal Switches while using Step block with parametrizing the Step time in which the first value from zero state changes to final value of 1, In circuit we can simulate addition of load and by which assess the affects of the change in Load.