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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: 82 / 174
When the automatic end position detection is used, the reference position is automatically calibrated in
the course of the initial commissioning procedure (teaching of travelling times).
With the sun protection function it is moreover possible to force the actuator to perform a reference travel
before each sun protection travel even if the positions are known. Thus, it is ensured that in case of sun
protection the parameterized sun protection position is always precisely approached even after repeated
position approaches.
Using the connected drives frequently for position approaches (for instance several times a day) can
result after some time in positioning inaccuracies. These deviations from the nominal position are mostly
due to external physical influences. To achieve accurate positioning in operation it is recommended to
perform the reference travel at least once every day. This can be achieved for instance by a central
raising command transmitted to the long-time object.
Presetting the position
The following ways of presetting positions can be distinguished…
–
direct positioning via the positioning objects (direct operation)
–
positioning by activating the sun protection function,
–
positioning by the behaviour after bus voltage failure or bus or mains voltage return,
–
positioning by a scene recall.
Positioning via the positioning objects:
Every blind, shutter, awning or louver can be positioned directly via the "Position..." object separate for each
output. An independent positioning object exist equally for the slats. The position approached is always the
position last received. The actuator shows no reaction, when the preset position value or the position to be
approached is received several times in succession.
Like the operation via short-time, long-time or central objects, this form of control is also designated as
'direct operation'. Positioning via the objects therefore has the same priority.
A position approach effected by the communication objects can be interrupted at any time by a short-time,
long-time or central command or by a scene recall.
The direct operation can be overridden by a function with a higher priority, e.g. manual control, forced
position, safety or also sun protection (parameterizable).
The position telegrams must conform to the 1-byte data format as per KNX datapoint type 5.001 (scaling).
The shutter actuator converts the value received (0...255) linearly into a position (0...100 %) (cf. table 2).
value received
(0...255)
position derived from value
(0…100 %)
0
0 %
upper end position / slat or louver opened)
(all intermediate values rounded off to 1 % increments)
255
100 %
lower end position / slat or louver closed)
Table 2: data format of positioning objects with conversion into percentage position values
It is possible that new positioning telegrams are being received while a position approach is in progress. In
this case, the actuator immediately reverses the direction of travel, if the new position to be approached lies
in the opposite direction.
If a slat positioning command is received during a running blind position approach, the actuator finishes first
the blind position approach before positioning the slat. If a blind positioning command is received during a
slat positioning movement, the actuator interrupts the slat positioning movement and approaches the new
blind position. The slat positioning command last received will only be executed after the blind position is
reached.