DALI Dimming Knowledge
1. How much power can a DALI system carry on one circuit?
2. What are the requirements for the length of the DALI system control line?
3. DALI Application Advantages
How much power can a DALI system carry on one circuit?
What is DALI?
DALI, known as the DigitalAddressable Lighting Intertace, is a data transfer protocol that defines how a driver communicates with a device controller.
the DALI protocol is not a system with complex control functions,
but rather a data transfer protocol for a lighting control subsystem. The DALI protocol is not a system with a variety of complex control functions, but simply serves as a data transfer
protocol for a lighting control subsystem.
The DALI protocol is based on a master-slave control model, where the controller operates the entire system through a master controller. In the DALI system, through the LED lamp
dimming controller can be addressed
separately to each driver, so that can be connected to the same control line for each LED lamp query, dimming and color control. A single-segment DALI data control line can be
addressed to 64 drivers, 64 drivers can be
set up within a maximum of 16 lighting scenes, the same driver can also be programmed in a group or in more than one group, the maximum number of groups is 16.
What are the requirements for the length of the DALI system control line?
The maximum value of voltage drop in DALI system is 2V, the length of wire diameter should meet the requirements of voltage drop
(1.5 square shielded wire is recommended), the length of control bus between the
control equipment in the system is 300m. both are indispensable. For the end control system, the length of 300m is enough, users can rest assured that the use.
DALI Application Benefits
1.Designed for simplicity and ease of use
DALI digital control system is easy to design, design as long as through the digital signal interface connected to each other, parallel to the 2-core control
line. All groupings and scenarios can be programmed or
systematically set up by computer software during installation and commissioning, which not only saves wiring costs, but also for design
modification, re-layout and segregation only requires changing the software
settings without rewiring, which is very simple and easy to do.
2. Simple and economical installation
DALI system wiring, no special requirements for the installation of wires, and no polarity requirements for the installation, only the main power line and
control line isolation, the control line does not need to be
shielded. Reminder again: it should be noted that the maximum current on the control line is 250mA, the maximum line length is 300 meters, and the
voltage drop on the line should be no more than 2V.
3. Precise and reliable control
DALI is a digital signal, different from analog signal, 1010 signal can achieve non-disturbance control, will not make the control signal distortion
due to long-distance voltage drop, so even if the DALI digital
signal control line and the strong wire with the same line pipe will not be interfered with. DALI signal is a bi-directional transmission, not only
forward transmission of the control commands, but also will be
the status of the driver and the LED lights, fault information, switch, and the actual brightness value will be fed back to the system.
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