The proportional-action component (P element) of the PID controller generates a partial manipulted variable yP which proportional to the actual error signal e(t). The P component is thus responsible for the "momentary" state and thus initiially ensures that the control loop response is generally reasonable. A pure P-component (P-controller) generally leads to a steady-state error signal eb, which is lower, the higher KP has been selected. However, excessive values for KP can lead to control loop instability.