PWM PROPORTIONAL-INTEGRAL
The PWM control algorithm, used to control the temperature adjustment system, allows
you to drastically reduce the times subject to thermal inertia and introduced by the two-
point control. This type of control involves the modulation of the impulse duty-cycle,
represented by the temperature adjustment system activation time, on the basis of the
difference between the fixed set-point and the temperature effectively detected. Two
components are needed to calculate the output function: the proportional component
and the integral component, used to improve the response in order to reach the
temperature at the fixed set-point. Once the proportional band has been defined (from
set-point to set-point -
for heating mode, from set-point to set-point +
for air-
conditioning mode), its width determines the extent of the system's response: if it is too
narrow, the system will be more reactive but with swings; if it is too wide, the system
will be slower. The ideal situation is one where the band is as narrow as possible, without
swings. The integration time is the parameter that determines the action of the integral
component. The longer the integration time, the slower the modification of the output
and hence the slower the system response. If the time is too short, the threshold value
will be exceeded, and the function will swing around the set-point.
USER INSTRUCTIONS
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23
cycle time
cycle time
set point
set point
set point
A
IR
-
CONDITIONING
H
EATING
set point
Summary of Contents for Chorus GW 10 764
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