ABB i-bus KNX Yucus YUB/U1.0.1 Series Technical Reference Manual page 121

KNX Technical Reference Manual
ABB i-Bus ® KNX Yucus
12.34.54 Control of cooling additional stage – Control value type
Options
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device" and the control function parameter is set on either
"Cooling with additional stage" or "Cooling and cooling with additional stages".
The actuation of the control valve is determined by the selection of the controller type.
– 2-Point 1 Bit, Off/On: The 2-point control is the simplest type of control. The controller
switches on when the room temperature drops below a certain level (setpoint temperature
value minus hysteresis) and switches off when a particular value (setpoint temperature
value plus hysteresis) is exceeded. The switch-on and switch-off commands are
transmitted as 1-bit commands.
– 2-Point 1 Byte, 0/100%: This is another two-point control as described above. In this
case, however, the switch-on and switch-off commands are transmitted as 1-byte values
(0% / 100%).
– PI continuous, 0-100%: The PI controller adjusts its output value between 0% and 100%
to match the difference between the actual value and the setpoint value and enables a
precise regulation of the room temperature to the setpoint value. It sends the control value
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).
12.34.55 Control of cooling additional stage – Additional cooling type
Options
PI continuous, 0 – 100% and PI
PWM, On/Off:
Options
Fan coil:
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device" and the control function parameter is set on either
"Cooling with additional stage" or "Heating and cooling with additional stages", only
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil
Area (e.g. floor cooling) 5°C 200 min
Free configuration
Fan coil 4°C 90 min
Free configuration
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