KNX control elements and application parameters
Application "Internal RTC"
Product manual 2CKA001473B5342
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236
10.24.17 Control of additional heating stage
Notice
Only available when the "Control function" parameter is set either on "Heating
with additional stage," or "Heating and cooling with additional stages".
10.24.18 Control of additional heating stage — Control value type
Options:
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil
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).
10.24.19 Control of additional heating stage — Additional heating type
Options:
PI continuous, 0 – 100% and PI PWM, On/Off:
■
Area (e.g. floor heating) 4°C 200 min
■
Convector (e.g. heater) 1.5°C 100 min
■
Free
configuration
Fan coil:
■
Fan coil 4°C 90 min
■
Free
configuration
