What is the PID action?
In simple terms, the PID (Proportional-Integral-Derivative) action is an output regulation modality that guarantees maximum rapidity and precision. The Proportional Action controls the output power according to the distance of the temperature measured by the set-point value; the Proportional Band indicates in how many C/F degrees (near to the set-point value) the output power passes from 100% to 0%. The Integral Action progressively increases or decreases the output power in presence of a residual (reset) error; the Integral Time indicates the seconds needed by the output to double or half its value. The Derivative Action varies the output value according to the temperature variation speed (rate) in order to avoid the transitory error due to the systems thermal inertia; the Derivative Time indicates the seconds necessary to bring the action back to zero. The PID action controls the output power periodically modulating the ON and OFF status and changing the ratio: the cycle time is expr
