ABB Busch-priOn Series Technical Reference Manual page 16

KNX Technical Reference Manual
®
Busch-priOn
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Control parameter for PWM controller and continuous controller (Fan coil)
For continuous control behaviour and for a switching PWM controller, the preset control parameters can be used via the
installation type of the heating or cooling system. If different control parameters are required, they should be set individually
via user parameterization. User parameterization should only be used by persons with adequate experience in control
technology.
The setting "User parameterization" can be used to set the "Proportional range (Xp)" and the "Readjust time (Tn". The
proportional range lies below and above the preset setpoint and determines the regulating speed. The readjust time amounts
to three times the delay time. The delay time is determined by the reversing tangent of the heating curve of the room. In
general, the more inactive the overall system, the larger the parameterization values should be.
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Two-stage heating / cooling
In specific instances such as when using underfloor heating, it may be necessary to install a quick additional stage for the
heat control in order to warm up the room rapidly. When the room thermostat is preset to "Additional heating stage active", it
has a second heating system with switching control that regulates with the 1-byte values 0% and 100%.
The parameters "Distance of the additional stage" and "Hysteresis (one-sided)" enable you to specify when the additional
stage switches on and off. For instance, if the setpoint for the additional stage is 18 °C and the hysteresis is 0.5 K (one-
sided), the controller switches on at 18 °C and off again at 18.5 °C.
The settings for the additional heating stage apply equally to the additional cooling stage, the only difference being that in
the case of cooling, when a set temperature has been exceeded, an additional cooling stage is switched on to cool the room
faster.
Since several actuating drives close (opened de-energised) at a 1-bit value of "1" or a 1-byte value of "255" and open at "0",
the mode of the control value can be changed via "Invert control value".
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Set values
The room thermostat can operate with dependent or individual set values. Both versions are explained in greater detail in the
following.
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Dependent setpoints
In case of dependent setpoints there are two basic setpoints, one for heating ("Heating setpoint comfort operation" and one
for cooling ("Cooling setpoint comfort operation").
The settings "...lowering standby/night mode" or "...raising standby/night mode". This means, for example, when 21 °C has
been set for "Heating setpoint comfort mode" and 2 K was specified for "Lower heating setpoint standby", the heating
setpoint in standby mode is lowered by 2 K to 19 °C. If 4 K has been specified for "Lower heating setpoint standby", the
setpoint for "Heating setpoint for night mode" is 17 °C.
The dependence of the setpoints are also maintained after a manual setpoint shift. For example, when the user has effected
a setpoint shift of 1 K upward to 22 °C for the parameterized temperature "Heating setpoint comfort mode", this value will be
lowered by 2 K to 20 °C when comfort mode is activated. When night mode is called up, the value will be lowered by 4 K,
resulting in a setpoint of 18 °C.
The user can manually change the parameterized setpoints via the two buttons "Raise temperature" or "Lower temperature".
The change between "Heating setpoint comfort mode" and Cooling setpoint comfort mode" is made via a long press (approx.
1 sec.) of button "Raise temperature" to heating setpoint and on button "Lower temperature" to cooling setpoint.
The two specified setpoints for heating and cooling can also be changed as often as desired via the bus without the ETS.
Here a 2-byte temperature value must be sent to the communication object "Base setpoint - control". Depending on whether
heating or cooling is currently active, the value is stored as "Heating setpoint comfort mode" or "Cooling setpoint comfort
mode". The values received are stored in the memory of the device and are retained in case of bus power failure and
subsequent return of bus voltage. This makes it possible to send new base setpoints to the device via a visualization when
the use of a room changes, for example.
New parameterization is not required. In case of a manual adjustment and dependent setpoints the reference base setpoint
is taken into consideration. This is used to specify whether the base setpoint refers to the comfort temperature for heating,
cooling or the mid-range temperature between heating and cooling.
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