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.cDesigning a <strong>DALI</strong> applicationMaximum of 16 <strong>DALI</strong> scenes per <strong>DALI</strong> circuitThe current on the <strong>DALI</strong> circuit must not exceed the maximum current of the power supply (<strong>DALI</strong> PS/PS1 =200mA or <strong>DALI</strong> PS2 = 240mA).The maximum cable length depends on the maximum permitted voltage drop along the <strong>DALI</strong> cable; this isdefined as 2 V max. This corresponds to a maximum cable length of 300 m for a line cross-section of 1.5 mm²;contact resistance must also be taken into account. A voltage drop of 2V must not be exceeded.The recommended minimum cable cross-section is 1.5 mm²Current draw of the <strong>DALI</strong> circuitEach device in the <strong>DALI</strong> circuit consumes current via the <strong>DALI</strong> circuit. The total current draw on the <strong>DALI</strong> circuit mustnot exceed the maximum current of the <strong>DALI</strong> power supply.To determine the current draw of a <strong>DALI</strong> circuit both the current draw of the <strong>DALI</strong> devices and the current draw of the<strong>DALI</strong> controllers must be taken into consideration. The current draw of a <strong>DALI</strong> device is defined in the <strong>DALI</strong> standardas 2 mA. The current draw of the individual <strong>DALI</strong> controllers (ComfortDIM devices) is shown in the relevant datasheets.It is important that the current draw of the <strong>DALI</strong> circuit does not exceed the maximum current of the power supply. Inthe case of <strong>DALI</strong>-PS and <strong>DALI</strong>-PS1 this is 200 mA.Example: <strong>DALI</strong> circuit with 24 dimmable ballasts (PCA EXCEL), 3 <strong>DALI</strong>-GC and 3 <strong>DALI</strong>-SCCurrent draw of the individual <strong>DALI</strong> components (from the data sheet):Dimmable ballasts (PCA EXCEL) = 2 mAGroup controllers (<strong>DALI</strong>-GC) = 6 mAScene controllers (<strong>DALI</strong>-SC) = 6 mATotal current = Σ Current draw of <strong>DALI</strong> devices + Σ Current draw of <strong>DALI</strong> controllersTotal current = 24 x ballasts + 3 x <strong>DALI</strong> GC + 3 x <strong>DALI</strong> SCTotal current = 24 x 2 mA + 3 x 6 mA + 3 x 6 mA = 84 mAMaximum cable lengthThe maximum cable length depends on the maximum permitted voltage drop along the <strong>DALI</strong> cable; this is defined as 2V max. Typically, this requirement is safely met for a cable length of 300 m and a cable cross-section of 1.5 mm².Additional voltage drops at terminal points must be taken into consideration. For cross-sections smaller than 1.5 mm²the maximum cable length is reduced accordingly....<strong>DALI</strong> Manual | 08-2013 | en59 / 93