Delayed Outdoor Temperature Adaptation; Control Signal; Three-Step Control - Samson TROVIS 5432 Mounting And Operating Instructions

Heating and district heating controller for automation system trovis 5400

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Description of the controller functions

7.2 Delayed outdoor temperature adaptation

Set the function block F3 to 1 = ON and P7 = Delayed outdoor temperature adaptation

A sensor AS for the outdoor temperature is required.

This function accounts for the fact that a building stores heat. Usually, short-term variations

in outdoor temperature do not affect the room temperature.

The function makes sure that brief variations in outdoor temperature (e.g. warm winds) are

not included in the flow temperature control.

If the outdoor temperature changes rapidly, this change is only taken into account to a cer-

tain degree. The change in outdoor temperature that is taken into account in the control is

defined over the parameter P7 (Delayed outdoor temperature adaptation).

For example, if the outdoor temperature changes by 7 °C/hr, just a 5 °C/hr change is used

for the control. This means, the calculated outdoor temperature changes more slowly than

the measured outdoor temperature. This function also applies when the controller switches

over to summer time operation.

The parameter P7 can be set in the range from 1 to 6 °C/hr. The setting of this parameter

depends on personal preferences and the building characteristic. The default setting is

5 °C/hr.

This setting determines whether the control signal is a three-step signal or on/off signal.

Set F4 to 1 = ON and P10 = Kp Gain, P11 = Tn Reset time and P12 = Ty Actuator transit

time.

The function of the three-step control has proportional plus integral action (PI controller).

Over the parameters P10 (gain factor Kp) and P11 (reset time Tn) the behavior of the control

loop can be influenced.

With the aid of parameter P12, the transit time of the control valve (Ty) is taken into account

in the algorithms. The control signal issuing is limited to three times of the duration of the con-

trol valve transit time (3 x Ty).

Note: If Tn = 0 is set, the controller functions only as a P controller.

EB 5432-1 EN

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