Universal dimmer actuators GDA2K-400 KNX / GDA4K-400 KNX
pdated: Mai-17 (Subject to changes) Page 48 of 63
4.2 Use of the force function
Example: Lighting with brightness control during the daytime and minimum lighting during the night.
The brightness controller continuously measures the brightness of the room and actuates the dimmer
as required to keep the brightness constant.
A dimming value of 20% is parameterized for forced operation.
In the evening at the close of work, the time switch activates forced operation, which dims down the
brightness to 20%.
During the night, the lighting is switched on for a certain period of time by the night-watchmen via the
central permanent ON function.
In the morning at the start of work, the time switch cancels the forced operation again and the dimmer
is actuated via the brightness control.
0 %
t(h)
100 %
A
n
d
Min.
B
C
E
P
n
m
e
D
F
n
c
G
H
Table 21
A
Forced operation is cancelled by the time switch.
As the daylight is not yet bright enough, the brightness control actuates the dimmer
B
The daylight is now bright enough to illuminate the room and the dimmer is switched off
C
Heavy cloud cover, the dimmer compensates for the lack of bright daylight
S
Clear sunshine, the dimmer is turned back down
E
Late afternoon, the dimmer gradually replaces the receding daylight
F
Forced operation is activated by the time switch
The dimmer reduces the light to 20%
G
Central permanent On = 1
N
Central permanent On = 0
n
During the night time, the parameterized value for forced operation applies
c
Night round of security guards: The lighting is switched on via central permanent On
m
Morning: Daylight increases and the brightness control slowly reduces the dimming value
e
Evening: Daylight decreases and the brightness control slowly increases the dimming value
d
During the daytime, the dimmer is actuated by the lighting control according to the brightness
of the sunlight
