L-DALI User Manual 341 LOYTEC
Version 5.2 LOYTEC electronics GmbH
unoccupied level (see Section 8.3.5.7). If the room becomes occupied before the light
has reached the unoccupied level, the saved light level is restored.
With automatic relinquish: A manual override will be automatically relinquished
when the room becomes unoccupied. In a special bedroom mode the automatic
relinquish will only take place if the lights are on. If they were switched off manually,
the controller does not return to automatic mode when the area turns unoccupied.
Control Mode
The CONTROL mode has to be selected if the installed light sensor measures the outdoor
illumination. The constant light controller receives the current outdoor lux level via the
property Controlled_Variable_Value and sets the lamp level (from 0% to 100%)
accordingly (see Figure 220).
The proprietary property Step_Value (property ID 544) ensures that the light level does not
change abruptly. Per second the light level is not changed more than the percentage value
defined by this configuration property. When the light is switched on or off, Step_Value is
not taken into account.
To ensure that the setpoint is reached under all weather conditions, the control curve shown
Figure 220 has to be adjusted by calibrating the constant light controller.
The control mode is available in different flavors:
With our without occupancy sensor: If an occupancy sensor is installed and the room
becomes unoccupied, the current light level is saved and the light is dimmed to
unoccupied level (see Section 8.3.5.7). If the room becomes occupied before the light
has reached the unoccupied level, the saved light level is restored.
With automatic relinquish: A manual override will be automatically relinquished
when the room becomes unoccupied. In a special bedroom mode the automatic
relinquish will only take place if the lights are on. If they were switched off manually,
the controller does not return to automatic mode when the area turns unoccupied.
Presence Mode
The PRESENCE mode has to be if the constant light controller shall operate as occupancy
controller. In this mode the light is switched to the value specified in the proprietary
property Occupied_Level (property ID 542) if the room is occupied and to the unoccupied
level (see Section 8.3.5.7) if the room is unoccupied.
The light is switched to the value Occupied_Level only if the lux level is below Setpoint and
the room is occupied.
The presence mode is available in different flavors:
With or without automatic relinquish: If automatic relinquish is active a manual
override will be automatically relinquished when the room becomes unoccupied.
Manual-On/Auto-Off Mode
The MANUAL_ON_AUTO_OFF mode is a variation of the PRESENCE mode. However,
in this mode the constant light controller does not switch on the lights, when the room
becomes occupied. Rather, it switches the lights to the unoccupied level (see Section
8.3.5.7) when the room becomes unoccupied, using the propertiy Hold_Time similar to
PRESENCE mode.
Lights can be switched on (or off) via some other DALI master (e.g. a DALI push-button).
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