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ABB i-bus KNX
4.1.2
Fan operation
© 2010 ABB STOTZ-KONTAKT GmbH
Planning and application
In fan operation a single phase fan, blower or convector can be controlled.
In combination with a valve control 2, 3 or 4 pipe system can be
implemented.
The fans are controlled via a 3 speed controller.
For this purpose 3 windings are tapped off of the fan motor. The speed
which results is dependent on the tap-off. It must be ensured that two
contacts are not switched on simultaneously. For control purposes at least
one 3 speed changeover switch with zero position is usually used. This
switch is simulated with a group of outputs in the Fan Coil Actuator.
The control of the FCA/S is implemented in accordance with the following
schematic principle:
With three Fan speed x switch (x = 1, 2, or 3) communication objects that
are independent of each other, the fan speeds are controlled via the outputs
of the Fan Coil Actuator.
Alternatively, the fan control can be implemented via a 1 byte
communication object Switch speed or via the communication object Speed
up/down.
Some ventilation controls require an additional central switch on mechanism
(main switch) in addition to the speed switch. This can be implemented with
a further output of the Fan Coil Actuator.
The output must be linked to the communication object Status Fan ON/OFF.
Hereby, the main switch is switched on 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.
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