APPLICATIONS DALI MCU
7. Other fields of application
Consider you have a similar room with a retractable dividing
wall, such as a conference room, a public hall or a
restaurant. When the dividing wall is closed, you want both
sections of the room to be individually dimmable and you
want to be able to switch lights off/on in either section
independently. When the dividing wall is open, however, you
want to control lighting synchronously across the entire room
(both sections) from any of the control points. To achieve
this, you would set up one DALI control circuit in each of the
sections You would then connect one control device in each
section (figure 5) to the mains, and optionally, you could also
install a second control device without mains connection in
each of the sections.
One DALI MCU control device in each of the two sections
must have a mains connection to make sure that it can
supply its assigned control circuit when the dividing wall is
closed.
When the dividing wall is closed, the position switch is in
open position, so the connection between the two control
circuits is broken. Then, lighting can be controlled and
dimmed in both sections independently.
When the dividing wall is open, the position switch is in
closed position and the control circuits in both sections and
their corresponding control points are turned into one single
parallel-connected control circuit. You will therefore be able
to control all lamps in both sections simultaneously. Please
pay special attention when connecting the control lines to the
terminals of the DALI MCUs (polarity!). Single-pole
interruption of the DALI control line via the position switch is
generally permissible. It does not matter, which of the two
control wires (Da+ or/and Da-) is used for switching or
whether both are used. As soon as the previously closed
dividing wall is opened – connecting the previously
interrupted DALI cable between the control devices in both
sections – illumination levels in both sections will adjust to a
uniform brightness within approx. 10 seconds. The
brightness level will match the level previously set in one of
the sections. Turning the knob on any of the DALI MCUs will
then change the lighting in the entire room based on this
previous level.
Figure. 5: DALI wiring layout in a dividable room
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