Characteristic Adjustment With Physical Minimum Dimming Value - ABB i-bus KNX Product Manual
Dali gateway emergency lighting
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ABB i-bus
KNX
Planning and Application
4.10.2
Characteristic adjustment with physical minimum dimming value
The second possibility for the characteristic curve adjustment considers the minimum dimming value of the
ballast. The physical minimum dimming value is calculated, so that the complete KNX adjustment range
from 1...100 % can be used on the KNX.
In the ideal case (ballast with a physical minimum dimming value of 0), the "normal" DALI transformation
table (4.13) results.
With a realistic physical dimming value of 3% (DALI 126), the following table results. In the KNX value ran-
ge 0...50%, the ballast cannot set a brightness difference.
A
KNX value [%]
B
KNX value
C
DALI value
D
Luminous flux [%]
E
KNX status brightness value
The following table results with the characteristic correction DALI dimming curve, without phys-min bright-
ness value with a DALI device featuring a dimming range of 3...100 %:
A
KNX value [%]
B
KNX value
C
DALI value
D
Luminous flux [%]
E
KNX status brightness value
*) Theoretically the value 1 is the feedback response as the minimum dimming threshold in the DGN/S is 1 % (digital
value 3), and only this value can be set and fed back.
The possible characteristic with the DALI Gateway and the characteristic correction are represented in the
following illustration. A ballast with a minimum physical brightness value of 3 % has been assumed.
150 2CDC 507 114 D0201 | DGN/S 1.16.1
0
0.4
0
1
0
1
0
3
0 126 126 126 126 144 170 195 210 220 229 235 241 246 250 255
0
0
0
85
0
0 3*)
Linearised characteristic
DALI characteristic, without
phys-min.
24
33
49
57
67
77
60
85 126 144 170 195 210 220 229 235 241 246 250 255
60
85 126 144 170 195 210 220 229 235 241 246 250 254
3
3
3
5
10
20
1
3
10
20
30
3
8
26
51
77
102
126
138
151
164
177
1
3
4
6
9
8
26
51
77
102
82
86
90
92
95
97
30
40
50
60
70
80
40
50
60
70
80
128
153
179
204
190
203
215
228
12
17
25
35
50
128
153
179
204
98 100
90 100
90
100
230
255
241
254
70
100
230
255
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