| Bus purpose |
This unit powers the DALI control bus. It is not the LED load power supply; LED drivers and control devices require a correctly designed complete lighting system. |
| Bus-current budget |
Keep each DALI circuit within 240 mA. A typical ballast takes less than 2 mA, so the catalog’s 64-ballast example uses 128 mA and leaves 112 mA for bus-powered control equipment. Calculate the actual consumption of all connected devices. |
| Bus wiring |
Maximum bus cable length: 300 m. Maximum bus voltage drop: 2 V. |
| Electrical safety |
DALI is not SELV. Apply installation procedures appropriate to mains wiring even though this power supply has Class II construction. |
| Power-supply start-up coordination |
The catalog’s DALI system table requires the bus supply to reach its guaranteed current within 250 ms. It separately lists 400 ms maximum for an advanced bus supply; an integrated bus supply has 400 ms maximum if other bus supplies are allowed, or 5 s if no others are allowed. These are coordination categories, not alternative operating modes assigned to this product. |
| Receiver start-up coordination |
For externally powered bus units: 450 ms maximum after an external power cycle, or 100 ms after bus power-down. Bus-powered receivers: 1,200 ms maximum after bus power-down. If external power cycles and bus power is unavailable within 350 ms, the 100 ms timing applies. |
| Transmitter start-up coordination |
A transmitter or multi-master transmitter waits at least 110 ms. The transmitter minimum does not apply to units unable to determine bus state. The table’s interface-voltage condition is an idle bus at 10 V, measured at the bus unit. |
