Proportional control (P)
In this mode a smooth, linear relationship exists between the controller output and the error. In an equation:
p = Kpep + p0
|Kp||proportional gain between error and controller output (% per %)|
|p0||controller output with no error (%)|
Proportion Band – only works for certain errors depending on the gain used.
If the conditions change, then the system can never get back to zero error conditions.