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To set up a constant light switch function certain parameters settings must be made which lead
to dependencies. These dependencies are displayed in the above diagram.
A switch-off delay can be set. This time expires when the presence detector no longer senses
movement. After expiry, an OFF telegram is sent on the output. Connected lamps are switched
off. The switch-off delay should always be higher than the "Delay after switch-on up to
measurement of the artificial light component" ([2] lamp used). In the worst case the light sensor
would measure the artificial light component when the lamps are switched off. This should be
avoided since the entire constant light switch function is based on this value. The "Delay after
switch-on up to measurement of the artificial light component" ([2] lamp used) is to be used
especially with lamps that take a few seconds to reach their full brightness. Fluorescent lamps
require up to around 250 seconds, whereas incandescent lamps reach their full brightness
almost immediately. The "Minimum time above the switch-off threshold" (3) ensures that the
natural light component attains a stable value before the artificial light is switched off. If this time
is too short, this could lead to an unwanted activation and deactivation of the lamps in the room.
This parameter is automatically preset by the selection of the lamp to be used.
Lux
1
Fig. 3:
Control parameters of constant light switch for two light rows
[A] Artificial light curve of light row 1
[B] Artificial light curve of light row 2
[C] 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)
Note
The hysteresis must be taken into consideration. However, this is not displayed
for reasons of simplicity.
Here the special parameter settings for 2 light rows must be observed.
KNX Technical Manual 2CKA001473B8667 │ 06.02.2017
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Product description
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