KNX Technical Reference Manual
ABB i-Bus
®
KNX Yucus
116
to the bus as a 1-byte value (0% - 100%). To reduce the bus load, the control value is
only transmitted if it has changed by a predefined percentage in relation to the previous
sent value. The control value can also be transmitted cyclically.
– PI PWM, On/Off: This also is a PI controller. Here, the output is a 1-bit command. For
this to occur, the calculated control value is converted into a pulse-interval signal.
– Fan coil: The fan coil controller operates like the PI continuous controller. In addition, it
allows the separate activation of the fan in the fan coil unit (e.g. fan speed levels 1 – 3/5).
12.34.42 Control cooling – Cooling type
Options
PI continuous, 0 – 100% and PI
Area (e.g. cooling ceiling) 5°C 200 min
Free configuration
Options
Fan coil 4°C 90 min
Note: This parameter is only available when "Control value type" parameter is
set either on "PI continuous, 0 – 100%", "PI PWM, On/Off“ or "Fan coil".
Two cooling types (area or fan coil) with preset parameters are available to the user.
If the required cooling type is not available, individual parameters can be specified in free
configuration.
12.34.43 Control cooling – P-component (x 0.1 °C)
Options Input from 10 to 100
Note: This parameter is only available when "Control value type" parameter is
set either on "PI continuous, 0 – 100%", "PI PWM, On/Off“ or "Fan coil". In addition, the
"Cooling type" parameter must be set on "Free configuration".
The P-component refers to the proportional band of a control. It fluctuates around the
setpoint value and can be used to influence control speed with a PI controller. The smaller
the setpoint, the faster it reacts to the control. However, to avoid the risk of an overshoot,
this value should not be set too low. A P-component from 0.1 to 25.5 K can be set.
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