57
9.8.32 Additional heating stage - Cyclic sending of the control value (min)
Options:
Setting option between 1 - 60 minutes
The current control value used by the device can be cyclically transmitted to the bus.
Note:
This parameter is only available when the "Control value type" parameter is set either on "2-point 1 Byte, 0/100%", "PI continuous, 0-100%" or "Fan coil".
Additional heating stage - Maximum control value (0 - 255)
Options:
Setting option between 0 - 255
The maximum control value of the PI controller defines the maximum value outputted by the controller. If a maximum value under 255 is chosen, the value will
not be exceeded, even if the controller calculates a higher control value.
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".
9.8.33 Basic heating stage - Minimum control value for basic load (0 - 255)
Options:
Setting option between 0 - 255
The minimum control value of the PI controller defines the minimum value output by the controller. If a minimum value greater than zero is chosen, the control-
ler will not output a lower value, even if it calculates a value that is lower. This parameter can be used to set a basic load, e.g. for operating floor heating. Even
if the controller calculates the control value zero, a heating medium will flow through the floor heating system to prevent the floor from cooling down. Under
"Settings of basic load", it is also possible to define whether this basic load will be permanently active or whether it will be switched by the "Basic load" object.
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".
9.8.34 Cooling control
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 "Cool-
ing", "Cooling with additional stage", "Heating and cooling" or "Heating and cooling with additional stages".
9.8.35 Cooling control - 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 transmit-
ted 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).
Description of application and parameters
"RTC object" application
