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Art. No. SC 1000 KNX
4.2.4.3.8 Fan controller
Operating mode and fan levels
The room temperature control can be supplemented with a fan controller. This makes it possible
to control the fan from heating and cooling systems operated by circulating air, such as fan coil
units (FanCoil units), depending on the command value calculated in the controller or using
manual operation. If necessary, the fan controller can be enabled separately by setting the "Fan
controller available" parameter in the "Room temperature control -> Controller general"
parameter node to "Yes". When the function is enabled additional parameters will appear in the
ETS in the "Room temperature control -> Controller general -> Fan controller" as well as
additional communication objects.
If the fan controller is enabled, the fan controller icon (figure 49) becomes visible in the display
after the device is commissioned (ETS programming operation).
i
The fan controller works only in conjunction with PI feedback controls with continuous or
switching (PWM) command value output. In 2-point feedback control, the fan controller is
inactive, even if the function is enabled in the ETS.
Depending on the operating mode of the room temperature control, as configured in the ETS
(see chapter 4.2.4.3.1. Operating modes and operating mode change-over), various controller
command values can be used as the basis for fan control. The "Fan operating mode" parameter
specifies which command value of the controller controls the fan controller. With one-level room
temperature control, it is possible to select whether the fan is activated during heating and/or
during cooling. With two-level room temperature control, it is also possible for the fan controller
to be set to the basic level or the additional level during heating and cooling. However, under no
circumstances is it possible to use the basic and additional levels simultaneously for a fan
controller within an operating mode.
Fan coil units are as a rule equipped with filters, and have multi-level blowers whose speed and
thus ventilation output can be varied by means of fan level inputs. For this reason, the fan
controller of the room temperature controller supports up to 8 fan level outputs, for which the
actually used number of levels (1...8) is set using the "Number of fan levels" parameter.
The controller controls the levels of a fan using bus telegrams. Usually, the fan level telegrams
are received and evaluated by simple switching actuators. The electrical control of the fan level
inputs of a fan coil unit takes place via these actuators. Depending on the data format of the
objects of the controlled actuators, the change-over between the fan levels can either take place
via up to 8 separate 1-bit objects or, alternatively, via one 1-byte object. The "Fan level change-
over via" parameter defines the data format of the controller. With the 1-bit objects, each fan
level discreetly receives its own object. With the 1-byte object, the active fan level is expressed
by a value.
Fan level
Object value
Fan OFF
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
Value meaning for 1-byte fan level object
Due to fan motors' inertia, as a rule there is a limit to how short the time intervals for switching
the fan levels can be, i.e. there is a limit to how quickly the fan speed can be varied. Often the
technical information for a fan coil unit specifies change-over times that the fan controller must
Page 213 of 347
Software "Smart Control 501511"
Functional description