ABB i-bus FCC/S 1 1 Series Product Manual page 186

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ABB i-bus KNX
Parameters
Example 1:
Temperature difference from basic-stage heating: 2 K
Setpoint temperature: 23 °C
Actual temperature: 19 °C
Additional stage is active until the actual temperature reaches 21 °C.
Example 2:
Temperature difference from basic-stage heating: 2 K
Setpoint temperature: 23 °C
Actual temperature: 22 °C
Additional stage is inactive as long as the actual temperature is above 21 °C.
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7.5.1.7.1.2.2 Dependent Parameter
P-proportion
Options:
The standard value depends on the option selected in the Additional-stage heating parameter in
the Application parameters parameter window.
The P-proportion stands for the proportional range in a control. It fluctuates around the setpoint
and in a PI control is used to change the speed of the control. The smaller the value set, the faster
the control reacts. However, the value should not be set too small because otherwise there may be
a risk of overshoot.
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7.5.1.7.1.2.3 Dependent Parameter
I-proportion
Options:
The standard value depends on the option selected in the Additional-stage heating parameter in
the Application parameters parameter window.
The I-proportion stands for the integral time in a control. The integral proportion causes the room
temperature to approach the setpoint slowly and also to reach it finally. Depending on the system
type used, the integral time may need to have different values. In principle the following applies:
The more sluggish the overall system, the larger the integral time is.
01.0...01.5...10.0
0...100...255
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 186