Gewiss CHORUS GW 16 974CB Manual De Programación página 61

CONTINUOUS PROPORTIONAL-INTEGRAL
The operating principle is similar to that of the PWM proportional-integral, but with the
difference that the communication objects for temperature adjustment management are of 1
byte.
This type of control involves the continuous control 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 -
set-point + for cooling 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.
The device continually adjusts the temperature adjustment system, sending percentage
activation values to the solenoid valve. With this type of algorithm, there is no longer a
hysteresis cycle on the heating/cooling element, so the inertia times introduced by the two-
point control are eliminated. This produces energy savings because the system does not
remain switched on when it is not needed and, once the required temperature has been
reached, it continues to provide a limited contribution to compensate for the environmental
heat dispersion.
USER INSTRUCTIONS
Setting the proportional band
Press the button key to access value change; after the
access, the current parameter value is displayed. Adjust
using the circular touch slider or the push-button
value of the proportional range of the proportional integral
control algorithm for heating
be set from 1°C to 10°C), depending on the type of
operation selected. To confirm the set value, press the
button key within thirty seconds; expiry of the timeout (30
seconds) or pressing the push-button
the change page without saving it.
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for heating mode, from set-point to
or cooling
result in exiting
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