Manual for ombra BST
LON slat angle automat
Order No.: 341 298
A further restriction for the condition "sun shines on facade" is made possible
by the adjustability (via plug-in) of so-called dead angles (for azimuth and
elevation). It serves to optimize the system. If, for example, an adjacent
building casts a shadow on the respective facade and thus causes the sun to
shine on it only from a certain horizontal angle (azimuth), this can be taken
into account by specifying the corresponding dead angle. This ensures a
better use of daylight.
Precalculation of the irradiation angle
The temporal course of the sun's position is the course of the sun,
i.e. the apparent path of the sun on the earth. Since the correct slat
position must continue to ensure glare protection when the
azimuth is exceeded (highest daily sun position), even when the sun
is sinking, the next control is calculated exactly in advance in this
case.
Specification of a time window
Additionally, the activation of the slat tracking can be limited to a certain time
window. This helps e.g. in the summer months to avoid unnecessary slat
positioning, because during this time the number of sunshine hours may be
higher than the "occupied time" of the building.
Information on positioning
Parameterizable sun position tracking for individual needs
The frequency of the control of the slat tracking as well as the minimum
change of the slat angle (adjustment angle) for a new control are always
considered in the automatic calculations based on the user's specifications.
Thus, individual adjustments can be easily implemented via the plug-in
software, even at a later point in time after moving into the building.
Position accuracy of the slat angle control
A slat angle adjustment is standard with a repositioning of 10°. An exact,
degree exact control of a blind motor is possible today by means of SMI. The
Standard Motor Interface (SMI) is a uniform building automation interface for
the control of electronic drives for example blinds or shutters with bus
topology. Furthermore, it is possible to achieve a high positional accuracy by
means of coordinated motors and actuators using incremental encoders.
However, with the slat tracking and shading correction described here, the
control of standard blind motors with absolutely sufficient accuracy can be
implemented at low cost. e.control blind actuators with high-current relays
for positioning the blind over the motor running time have an accuracy of 50
milliseconds. With a standard turning time of common motors of 1.6 seconds
Version 1.00
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08.09.2020
