Which action of the integral controller restores balance after a load change at the set point?

The integral controller's primary function is to eliminate the steady-state error that may occur in a control system by integrating the error over time. When there is a load change at the set point, the integral controller adjusts the control output based on the cumulative sum of past errors. This action is referred to as "reset," as it helps to re-establish balance by adjusting the feedback loop to correct for the error introduced by the load change.

In this context, the reset action works to correct any deviation from the set point, ensuring that the system can restore itself back to the desired level steadily and effectively. This is crucial in maintaining system stability and performance, particularly in applications where precision is essential. Thus, the "reset" action of the integral controller is key in addressing and compensating for disturbances or changes in the load, leading to a more stable and accurate control system.