ABB i-bus KNX Yucus YUB/U1.0.1 Series Technical Reference Manual page 126

KNX Technical Reference Manual
ABB i-Bus ® KNX Yucus
available when "Control value type" parameter is set either on "PI continuous, 0 – 100%",
"PI PWM, On/Off" or "Fan coil".
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 floor cooling. Even if the controller calculates the control
value zero, a cooling medium will flow through the floor cooling 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.
12.34.67 Setting of basic load – Minimum control value for basic load > 0
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
"Heating with additional stage", "Cooling with additional stage", "Heating and cooling" or
"Heating and cooling with additional stages".
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 switch via the "Basic load" object.
– Activate via object: When this parameter is select, 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.
12.34.68 Setting of basic load – Basic load active when controller is off
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
"Heating with additional stage", "Cooling with additional stage", "Heating and cooling" or
"Heating and cooling with additional stages".
Always active
Activate via object
No
Yes
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