Automatic Operation - ABB i-bus KNX FCA/S 1.1M Product Manual

ABB i-bus KNX
4.2.1

Automatic operation

© 2010 ABB STOTZ-KONTAKT GmbH
Planning and application
With automatic fan control, a fan drive is connected directly to the Fan Coil
Actuator and switched via three floating contacts. A single speed, two speed
or three speed fan can be connected.
The fan speed is set automatically in dependence on the control value.
For example, the following control value ranges can be programmed for the
corresponding fan speeds:
Control value
0... 9 %
10... 39 %
40... 69 %
70...100 %
The Fan Coil Actuator FCA/S 1.1M is purely an actuator which does not
have a controller for a room temperature controller (thermostat). Control of
the room temperature is implemented using a room temperature controller
which generally detects the room temperature. The FCA/S 1.1M primarily
controls a fan and valves. In addition to a manual control via the
communication objects Fan speed x, Fan speed switch or Fan speed
up/down, the Fan Coil Actuator can also operate in automatic mode together
with a thermostat. Communication objects Control value HEATING, Control
value COOLING or when operating with just a single input variable, the
object Control value HEATING/COOLING are available.
The automatic mode is enabled in the parameter window Fan with the
parameter Enable automatic operation. Depending on the HVAC system,
this is set in the parameter window Control input and the control value
objects are enabled.
An automatic operation parameterised in the ETS only becomes active after
the first download. With a subsequent download the automatic operating
state (active, inactive) is retained as it was before the download. There is
however an exception when system properties such as
HVAC systems, fan control (changeover, speed control) or the number of fan
speeds has been changed (1/2/3). In these cases the automatic mode is
activated if the automatic mode has been enabled in the ETS.
Automatic mode is switched off either by a manual setting command via the
communication objects Speed x, Fan speed switch or Fan speed up/down,
or if a telegram with the value 0 is received via the communication object
Automatic ON/OFF.
The automatic operation can be reactivated by the communication object
Automatic ON/OFF or the 1 byte communication object Toggle limitation.
An activation of one of the four limitations or the forced operation does not
end automatic operation. By using a range limit (several fan speeds are
permissible), a limited automatic control with several fan speeds is possible.
Fan speed
0 (fan off)
1
2
3
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