Control Of Additional Cooling Stage; Control Of Additional Cooling Stage - Cooling Type - Busch-Jaeger mini KNX 6131/20 series Technical Manual

11.8.50 Control of additional cooling stage

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".
Options:
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).
11.8.51 Control of additional cooling stage — Cooling type
Options:
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.
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".
KNX Technical Manual 2CKA001473B8667 │ 06.02.2017
Description of application and parameters
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil
PI continuous, 0 – 100% and PI PWM, On/Off:
– Area (e.g. cooling ceiling) 5°C 240 min
– Free configuration
Fan coil:
– Fan coil 4°C 90min
– Free configuration
Application "RTC object"
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