Three Questions On DALI Systems

DALI outdoor LED driver

What are the requirements onthe control line length of the DALI system?

The length of the control line should meet the voltage drop requirements. The maximum voltage drop in the DALI system is 2V, relatively, the distance between the two farthest components in the system is 300m. For the terminal control system, the length of 300m is sufficient, and users can use it safely.

According to the DALI standards, each LED driver has a specified value. Normally, when there is no data communication, the common control line in the DALI system is 16V, and the voltage is supplied by the DALI internal power supply.

How many power supplies can the DALI system carry?

A standard DALI system can carry up to 64 independent address power supplies. The maximum current provided by the DALI system is 250MA, which is a limitation of the DALI system.

Up to 64 digital LED drivers can be connected to the DALI line, regardless of system nodes and power supply current limitations.

If a control element conforming to the DALI protocol is used, the size of the system must meet 64 points or a total current of 250mA. When the system includes both LED driver and control components, it should be ensured that the system meets these restrictions. If a DALI system exceeds 64 points or the system current is greater than 250mA, the signal will be attenuated, distorted, and cause system errors. Some components may not be able to communicate, and the system will run unstable.

What are the special requirements for lamps or light sources when using the DALI system?

We know that the DALI system gives new connotations to the lamps. Each lamp can have an independent address. Therefore, the lamps are upgraded from ordinary lamps to “smart lamps”. Smart lamps has no requirement changed to the light sources and luminaries, but it requires the LED drivers and electronic transformers must be the ones comply with the DALI standards. The DALI LED driver and digital transformers have the features of independence, thus reflect the address of the lamp.

In addition to LED drivers and transformers, other components (such as sensors) in the DALI system must also comply with the DALI standards, thus forming a complete DALI lighting control system.

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