KNX Technical Reference Manual
ABB-i-Bus
®
-KNX Millenium
Description of applications /
objects
KNX Technical Reference Manual | 1473-1-8681
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11.3.59
Additional cooling 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 controller 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 surface cooling. Even if the controller calculates the control value zero, a
cooling medium will flow through the cooling area to prevent the floor from heating up. 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".
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11.3.60
Settings of basic load
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
"Heating with additional stage", "Cooling with additional stage", "Heating and
cooling" or "Heating and cooling with additional stages".
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11.3.61
Settings of basic load - Minimum control value for basic load > 0
Options:
Always active
Activate via object
The function finds application when in the desired area, e.g. with floor heating, the floor is to
have a basic warmth. The size of the minimum control value specifies the volume of heating
medium that flows through the controlled area, even when the calculation of the control value of
the controller would indicate a lower value.
–
Always active
: Here it is possible to define whether this basic load will be permanently active
or whether it will be switched via the "Basic load" object.
–
Activate via object
: When this parameter is selected, the basic load function, which means
the minimum control value with a value higher than zero, can be activated (1) or deactivated
(2). If it is activated, then the heating medium will always be fed through the system with at
least the minimum control value. If it is deactivated, the control value can be reduced to zero
with the controller.
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11.3.62
Combined heating and cooling modes
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
"Heating and cooling" or "Heating and cooling with additional stages".
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