ABB i-bus KNX Product Manual

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ABB i-bus KNX Product Manual Manual pdf 151 page image

ABB i-bus ® KNXPlanning and ApplicationDGN/S 1.16.1 | 2CDC 507 114 D0201 1494.10.1 Characteristic adjustment of the linear dimming curveThe DALI characteristic compliant to IEC 62386-102 described in the previous chapter can be modified viathe DGN/S 1.16.1, so that it provides a linear characteristic from KNX brightness value [%] to luminousflux.Based on the KNX brightness value (row A or B), the DGN/S calculates the corresponding DALI controlvalue (row C), which is required to achieve the same luminous flux (row D) from the figure value.Thus, a brightness value on the KNX of 3 % (digital value 8) is also provided as a luminous flux of 3 %.This has the benefit that the KNX value range can be used almost completely for the brightness value. Inthis way, the light yield of the lighting equipment has not changed. Furthermore, it must be considered thatthe perceived linear brightness response due to the logarithmic DALI curve is no longer available.In an ideal case, the following transformation table results:A KNX value [%] 0 1 3 5 10 20 30 40 50 60 70 80 90 100B KNX value 0 3 8 13 26 51 77 102 128 153 179 204 230 255C DALI value 0 85 126 144 170 195 210 220 229 235 241 246 250 254D Luminous flux [%] 0 1 3 5 10 20 30 40 50 60 70 80 90 100E KNX status brightnessvalue 0 3 8 13 26 51 77 102 128 153 179 204 230 255With the linear characteristic, a dimming range of 3…100 % results with a DALI device as featured in thefollowing table:A KNX value [%] 0 1 3 5 10 20 30 40 50 60 70 80 90 100B KNX value 0 3 8 13 26 51 77 102 128 153 179 204 230 255C DALI value 0 85 126 144 170 195 210 220 229 235 241 246 250 254D Luminous flux [%] 0 1 3 5 10 20 30 40 50 60 70 80 90 100E KNX status brightnessvalue 0 3 8 13 26 51 77 102 128 153 179 204 230 255The marked values are again the values, which result for a ballast with a dimming range of 3 %…100 %. Itbecomes clear that when on the KNX the control values for the brightness value between 3 % and 100 %are used, the emitted light yield range does not change.