ABB i-bus FCC/S 1 1 Series Product Manual page 198

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ABB i-bus KNX
Parameters
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7.5.1.8.1.1.2.4.3 Dependent Parameter
Input for temperature limit sensor
Options:
• Via group object: The temperature value is received via a dedicated group object. The depen-
dent Basic-stage cooling limit temperature group object is enabled.
• Via physical device input x: The temperature value is acquired via a temperature sensor con-
nected (to the selected input).
A temperature sensor must be actually connected to the temperature input selected and the input
for the sensor must have been correctly parameterized, otherwise the limit temperature function
does not work.
If one of the device inputs is selected here as the input for the limit temperature, this input is no
longer used to acquire the room temperature. It is therefore not possible to use the same temper-
ature sensor for the measurement of the room temperature and for the measurement of the limit
temperature.
7.5.1.8.1.2 PI continuous (0...100 %), PI PWM (On/Off), PI continuous (0...100 %) for Fan Coil
The following parameters are enabled if the PI continuous (0...100 %), PI PWM (On/Off) or PI con-
tinuous (0...100 %) for Fan Coil option has been selected in the Basic-stage cooling control value
type parameter.
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7.5.1.8.1.2.1 Dependent Parameter
P-proportion
Options:
The standard value depends on the option selected in the Basic-stage cooling 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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7.5.1.8.1.2.2 Dependent Parameter
I-proportion
Options:
The standard value depends on the option selected in the Basic-stage cooling 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.
Via group object
Via physical device input a
Via physical device input b
Via physical device input c
Via physical device input d
Note
01.0...01.5...10.0
0...100...255
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 198