Switch/shutter actuator 8/4gang 16A RMD
75318003
Switch/shutter actuator 16/8gang 16A
RMD
75310002
Technical
Documentation
© Berker GmbH & Co KG 2007
Version: 04.04.2007
Part 5
(Subject to prior change)
75310002.doc
Seite: 80 / 174
Exception: The desired blind position of 0 % (upper end position) is assigned to the slat position of 0 %. The
re-adjustment of the slat position will result also in this case in a change of the blind height (brief downward
travel). Only in this case will the actuator report back a blind position above the desired blind position (cf.
Fig. 28). With slat type 1, the slats are generally horizontal when the blind is in its upper end position. For
this reason, the calculated slat position with a slat of type 1 corresponds to the actual opening angle only
after the first slat is completely extended (100%).
blind (desired pos.) = 0 %
0%
insolation
Sun
100%
blind = 5 %
blind = 10 %
upper end position
travel movement
100%
50%
0%
upper end position
travel movement
blind (desired pos.) = 0 %
Fig. 28: Example of slat positioning with the blind in upper end position
(typical of slat type 1)
Example (cf. Fig. 28)…
The blind position is preset to 0 %. After an extended travel movement, the blind is safely in the upper end
position. A change of the slat angle (0 %...100 %) initiates the calculation of a new blind position which is
also tracked in the position feedback objects. If the actuator is to approach a new blind position of, let's say
5 % in this case, the actuator will not perform a travel movement as the calculated travelling time lies within
the parameterized slat moving time and therefore coincides with the slat movement. A change of the blind
position to 15 % in this case triggers a blind movement as the change does not lie within the slat movement
(0 to 100 %).
The switching/shutter actuator executes slat position adjustments only if a new position deviating from
the current slat position is preset.
The switching/shutter actuator stores the slat positions temporarily. The actuator can approach newly
preset slat positions only if the current position is known. For this purpose, each output must be given the
opportunity to synchronize itself whenever the supply voltage is switched on or after every ETS
programming (physical address, application program, partial download). The synchronization is
performed with the help of a reference travel for the slat or the blind (cf. "Reference travel").
A change of the blind height will always result in a change of the slat position. After reactivation of the
supply voltage of after ETS programming, the actuator will in this case generally move the slats into the
100 % position, if no position has been preset for the slats.
The smaller the ratio between slat moving time and blind travelling time, the more precise the position
approaches and the less marked the influence of the slat angle adjustment on the height of the blind.
