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4.5.4
Constant light
Depending on the version, the devices offer various options to ensure that the brightness in the
room is maintained at a more pleasant level. There is a difference between the functions of the
constant light switch and the constant light controller. Both functions ensure that the brightness
does not drop below a certain level when persons are in the room. The use of a presence
detector is especially practical for work stations in an office, since even small movements are
detected.
The constant light switch can switch lamps on and off. The constant light controller can
additionally dim lights, to maintain a level that is as constant as possible. Both functions work in
dependence of light conditions and movement in the detection range. The devices can operate
either in "Automatic" or "Automatic switch-off" mode. If automatic switch-off is selected, for
example, the light must be switched on manually via a control element. The light remains on as
long as movement is detected and daylight is not sufficient. If no movement is detected, the
switch-off delay expires. Only then is an OFF telegram sent to the bus via the output. In
automatic mode the movement sensor also takes over the switch-on function as soon as
someone enters the room.
Constant light switch
The constant light switch switches on lamps in the room as soon as movement of a person is
detected and the desired brightness value is not attained by the entering daylight alone. The
programmed setpoint minus hysteresis is maintained as long as people are in the detection
range. The application detects when the entering daylight is sufficient. The lamps are then
switched off again to save energy.
500 Lux
1
Fig. 2:
Control parameters of constant light switch for one light row
[A] Artificial light curve
[B] Sunlight curve
Control parameters:
[1] Setpoint (lx)
[2] Lamp used (delay time preset: LED / halogen = short delay time; (compact) fluorescent lamp = delay time
of 4 minutes)
[3] Minimum time above the switch-off threshold (min) -> parameter setting no longer exists (automatically
preset by the specification of the lamp to be used: LED / halogen = 1 minute; (compact) fluorescent lamp
= 4 minutes)
KNX Technical Manual 2CKA001473B8667 │ 06.02.2017
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Product description
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