ABB i-bus
®
KNX
Parameters
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 270
7.10.1.3
Enable automatic mode based on control value
Options:
Yes
No
This parameter is used to enable automatic fan operation depending on the control value. In this
mode the fan automatically follows the control value for the heating/cooling mode currently active.
This means that the higher the control value is, the greater the fan speed is as well.
•
Yes
: Automatic operation is activated. The group objects
Activate/deactivate fan automation
and
Status Fan automatic
are enabled. The dependent parameters are displayed.
•
No
: Automatic operation is deactivated. The fan only reacts to control via the fan objects.
Note
Automatic control is always enabled in the controller mode and cannot be completely deacti-
vated. The purpose of this feature is to ensure the correct function of the device, because other-
wise the device would only react to manual adjustment.
If the device is used in the controller mode such that both a basic stage and an additional stage
(e.g. heating) are in one fan coil unit, in the automatic mode the fan only follows the control value
for the basic stage.
If the additional stage is in a dedicated fan coil unit, this situation can be addressed by activating
the automatic mode in the device used there and using the control value for this device.
NOTICE
The device evaluates threshold values in ascending order, i.e. first it checks the threshold value
for Off <-> Fan speed 1, then Fan speed 1 <-> Fan speed 2, and so on.
Proper functionality is only assured if the threshold value for OFF <-> Fan speed 1 is less than
that for Fan speed 1 <-> Fan speed 2 and this is less than Fan speed 2 <-> Fan speed 3, etc.
7.10.1.3.1
—
Dependent Parameter
Threshold value speed 0 <-> 1
Options:
0…1…10
Here the threshold value, at which switch on of fan speed 1 occurs, is set. If the value in the group
object
Control value
is greater than or equal to the parameterized threshold value, fan speed 1 is
switched on. If the value is smaller, then it is switched off. If the value is set 0, the fan is only shut
down with the control value 0. As soon as the control value is greater than 0, speed 1 is used.
To make sure that the valves are not opened too wide without the fan running, only 10 % can be
set here as the maximum value
7.10.1.3.2
—
Dependent Parameter
Threshold value speed 1 <-> 2
Options:
1…30…100
This sets the threshold value at which switch over to fan speed 2 occurs. If the value in the group
object
Control value
is greater than or equal to the parameterized threshold value, switch over to
fan speed 2 occurs.