ABB i-bus KNX Product Manual - page 200
ABB i-bus
KNX
Planning and application
198 2CDC 507 100 D0202 | DLR/S 8.16.1M
4.12.2
Characteristic adjustment of phys-min dimming value
In the ideal case, (ballast with a physical minimum brightness value of 0), the "normal"
, page 197, results.
With a realistic physical dimming value of 3% (DALI 126), the following table results. In the KNX value
range 0…50 %, the ballast cannot set a brightness difference.
E
KNX status
Brightness value
0
126 126 126 126 144 170 195 210 220 229 235 241 246 250 255
D
Luminous flux
[%]
0
3
3
3
3
5
10
20
30
40
50
60
70
80
90
100
C
DALI value
0
1
60
85
126 144 170 195 210 220 229 235 241 246 250 254
B
KNX value
0
1
60
85
126 144 170 195 210 220 229 235 241 246 250 255
A
KNX value [%]
0
0.4
24
33
49
57
67
77
82
86
90
92
95
97
98
100
The following table results with the characteristic adjustment Yes, linear dimming curve without phys-min
dimming value
with a DALI device featuring a dimming range of 3…100 %:
E
KNX status
Brightness value
0
3
*)
8
26
51
77
102
128
153
179
204
230
255
D
Luminous flux [%]
0
1
3
4
6
9
12
17
25
35
50
70
100
C
DALI value
0
85
126
138
151
164
177
190
203
215
228
241
254
B
KNX value
0
3
8
26
51
77
102
128
153
179
204
230
255
A
KNX value [%]
0
1
3
10
20
30
40
50
60
70
80
90
100
*)
Theoretically the value 1 is reported back. As the minimum dimming threshold in the DLR/S is 1 % (digital value 3), only
this value can be set and fed back.
The possible characteristics with the DALI Light Controller and the characteristic adjustment are
represented in the following illustration. A ballast with a minimum physical brightness value of 3 % has
been assumed.