SITEC S.r.l. Industrial electronics
User Manual TRG 72x72
R2.A
Pag. 19
5.8 I
NTEGRAL TIME
In order to set up the integral time you have to enter the configuration menu (see paragraph
), then enter
the
1nt
), and select the desired value and save the new value by the OK key.
The integral control was introduced to improve the accuracy of the proportional control.
Indeed, in a system controlled only by the proportional system, with the proportional band large enough not
to induce self-oscillations, the result is a stable but not sufficiently accurate system, while, with the integral
control the output power increases as long as the temperature is equal to the setpoint. At this point the out-
put of the integrator stops increasing, and keeps a steady power.
The integral control is characterized by the
Integration time
, described as the time necessary in order for
the integral output to vary from zero to its maximum in the presence of a fixed error equal to the proportional
band.
To disable the integral time, you have to set it to 0.
Please note
:
the integral time can be set up only after having started the temperature setting via PID (see
Hereafter is shown the behaviour of the integrator in the presence of an error equal to the proportional band
as you can see, as the integral time increases, also the time necessary for the integrator to reach the 100%
increases.