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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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