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ABB i-bus
KNX
Planning and application
4.1.1
Fan operation
In fan operation a single phase fan, blower or convector can be controlled. Fans are controlled via a three-
stage speed controller. For this purpose, three windings are tapped off of the fan motor. The resulting fan
speed is dependent on the tapping selected. With changeover control you must ensure that two contacts
are not switched on simultaneously. For control purposes, at least one three-stage changeover switch with
zero position is usually used.
The device is controlled in accordance with the following schematic principle:
The device's outputs control fan speed with three mutually independent Switch speed x (x = 1, 2, or 3)
communication objects.
Alternatively, the fan can be controlled via a 1 byte communication object Fan speed switch or via the
communication object Fan speed up/down.
Some ventilation controls require an additional central switch on mechanism (main switch) in addition to
the speed switch. Another output of the device may be used for this. The output must be linked to the
communication object Status Fan ON/OFF. This will switch on the main switch if at least one fan speed is
set. If the fan is OFF (Status Fan ON/OFF = 0), the main switch is also switched off.
82 2CDC508116D0203 | FCL/S x.6.1.1
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