DALI manual - Tridonic
DALI manual - Tridonic
DALI manual - Tridonic
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Introduction: <strong>DALI</strong> standard<br />
Features of <strong>DALI</strong><br />
Simplified Installation<br />
No polarity<br />
Stable dimming<br />
function<br />
Distributed<br />
intelligence<br />
Status feedback<br />
Flexibility<br />
Logarithmic dimming<br />
curve<br />
Power lines and control lines can be laid together in the same cable. The wiring may be in<br />
series, in a star arrangement or in mixed form.<br />
There is no need to worry about the polarity (+/-) of the <strong>DALI</strong> control line.<br />
All the luminaires receive the same interference-free digital signal and therefore the same<br />
dimmer value.<br />
<strong>DALI</strong> uses a system of distributed intelligence; multiple controllers (e.g. <strong>DALI</strong> GC)<br />
communicate with intelligent ballasts. Each controller operates as a “master” and controls<br />
communication on the control line. Ballasts react only as “slaves” at the request of the<br />
“master”. Certain parameters are stored directly in the <strong>DALI</strong> unit (e.g. scene values, group<br />
address).<br />
Status reports can be issued by the <strong>DALI</strong> units. Information on faulty lamps for example<br />
can therefore be transferred directly to a higher-ranking system.<br />
Group assignment is set up by means of parameters and not by hard wiring. Lighting<br />
scene values are stored in the <strong>DALI</strong> unit.<br />
The dimming curve is matched to the sensitivity of the eye.<br />
Technical features of a <strong>DALI</strong> circuit<br />
Maximum no. of <strong>DALI</strong><br />
groups<br />
Maximum no. of <strong>DALI</strong><br />
scenes<br />
<strong>DALI</strong> voltage<br />
<strong>DALI</strong> system current<br />
Data transfer rate<br />
Maximum cable length<br />
16<br />
16<br />
9.5 V - 22.5 V, typically 16 V<br />
Max. 250 mA (depending on the installed <strong>DALI</strong> power supply)<br />
1200 baud<br />
The maximum cable length depends on the maximum permitted voltage drop along the<br />
<strong>DALI</strong> cable; this is defined as 2 V max. This corresponds to a maximum cable length of<br />
300 m for a line cross-section of 1.5 mm².<br />
<strong>DALI</strong> Manual | 08-2013 | en<br />
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