Technical data

8.6.
8.
Daylight-controlled regulation
The TRIOS DALI multifunctional light controller
LRC 1620 is ideal for daylight-controlled regulation.
The following illustration shows the operating cycle.
Figure 29: Regulation cycle for dimmable luminaires
With increasing daylight the total of the natural and
artificial light matches the value of total illuminance
calibrated in the controller. The calibration
procedure is described below.TRIOS DALI regulates the
artificial light continuously until the minimum dimming
setting is reached, ensuring that the required
illuminance level is constantly maintained.As soon as the
total illuminance exceeds 1.5x the preset level , a
waiting time of 15 min. is initiated, and TRIOS DALI then
switches off the artificial lighting .This combination of
limit value and waiting time is preprogrammed into
TRIOS DALI to obviate unnecessary and disturbing
switching on and off of the lighting in response to
momentary and minor changes of weather conditions.
If the circuit is designed with an automatic re-activation
feature TRIOS DALI will switch on the lighting installation
again as soon as the daylight level falls below the fixed
threshold .The dimming sequence then ensues in
reverse order ensuring constant illuminance balancing
decreasing natural light and increasing artificial light
.
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