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ABB i-bus KNX
© 2010 ABB STOTZ-KONTAKT GmbH
Commissioning
Four limitations are available. This can be used for example for the control
of various operating modes such as frost/heat protection, night shut down
and standby. In normal cases the thermostat takes these operating modes
into account in its control variable for the actuator.
Important
The parameterised starting behaviour which is a technical characteristic
of the fan has a higher priority than a limitation or forced operation,
i.e. if a limitation is activated in fan speed 2 and a start-up behaviour is
parameterised via fan speed 3, the following behaviour will result: The fan
is in the OFF state and receives a control signal for fan speed 1. Initially
the fan operates at fan speed 3 (start-up speed) and then proceeds to fan
speed 2 which is defined by the limitation. The actual required fan speed 1
will not be achieved due to the limitation.
The sequence of the displayed parameters corresponds with their priorities,
i.e. the parameters with the highest priority has limitation 1 followed by
limitation 2, 3 and 4.
Note
The fault operation, e.g. as with a malfunction of the thermostat has a
lower priority than the fan limitation, i.e. by a limitation of the fan speed
during a thermostat malfunction only the upper or the lower limit of the fan
limitation can be set at best.
When automatic mode is exited, e.g. by a manual action, the limitations
1 to 4 remain.
The following points apply for limitations:
The fan speed and valve position can be parameterised independently.
The limitation need not necessarily apply to one fan speed only.
It can also encompass another range of the fan speeds, i.e. only certain
fan speeds can be set if the limitation is active. In this way a limited
control is also possible.
The limitation is activated if a telegram with the value 1 is received on
the limitation object. The limitation is deactivated if a telegram with the
value 0 is received on the limitation object. A manual action ends
automatic mode.
If a limitation is activated, the Fan Coil Actuator switches to the
parameterised fan speed regardless of the control value. If during the
activation of the limitation another fan speed or a fan speed outside the
range of the "limitation range" is set, the required fan speed or the limit fan
speed of the range is set.
After switch off of the limitations, the fan speed and the communication
objects for valve control are recalculated and executed, This means that
during limitation the actuator operates normally in the background, the
outputs are not changed and implementation only occurs after the end
of limitation.
There are the same parameters for each of the individual four limitations
used to limit the fan speeds. The priority is according to the listed sequence.
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