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ABB i-bus
®
KNX
1.2.4
DALI functional description
1.2.5
DALI dimming curve
Introduction
The DALI interface norm is standardised in DIN IEC 60929. With DALI,
a standard has been created which meets the requirements of modern
lighting technology due to its digital possibilities. The essential functions are:
• Individual dimming speeds for each device
• Lightscenes with fade times
• Scene devices reach their final brightness value simultaneously
• DALI ballasts have a dimming range of 1 to 100%
• DALI uses a logarithmic dimming curve
• Current brightness values and ON/OFF states can be queried
• Ballast and lamp faults are detected
• Behaviour in the event of a system fault can be defined
• Global control of all DALI devices (broadcast mode)
DALI has established itself since 1999 as a company-neutral interface
standard. It is possible to control fluorescent lamps, incandescent lamps,
LEDs etc. via DALI, combine them into light scenes and to integrate them
with the ABB i-bus
®
DALI-Gateway DG/S 8.1 in the KNX building
installation.
The DALI standard can be seen as a subsystem of modern building system
technology which links the components of lighting technology and is not
dependent on one manufacturer.
The DALI dimming curve is matching the sensitivity of the human eye.
Therefore results a logarithmic dimming curve, which is a linear brightness
response for the human.
The dimming value is shown in the following diagram. The curve is specified
in the DALI standard (EN 60929 or IEC 62386).
As not all DALI control gear start at 0.1 % luminous flux, the minimal physi-
cal dimming level is to attend. E.g. 126 (corresponding to 3 %) is the lowest
value for DALI ECGs with a minimal dimming level of 3 %. All values (except
7
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