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| iControl Electronics Co., Ltd www.icontrol.com.vn |
EcoSystem/DALI Digital (4-wire: Hot and Neutral, plus 2
low-voltage data link topology-free wires):The DALI (Digitally Addressable
Lighting Interface) standard originated in Europe for control of fluorescent
ballasts, but is now also used in commercial buildings in the United States. DALI
is defined in IEC standard 62386 for fluorescent dimming ballasts and LED
drivers. It allows digital control of individual fixtures, maximizing the
user’s control and productivity. There is currently no support for controls or
sensors tied directly to the DALI link in the protocol, so each DALI
manufacturer has to offer a manufacturer-specific DALI implementation in order
to support these elements. For example, Lutron offers proprietary enhancements
to DALI in the EcoSystem digital lighting control protocol. While the DALI standard is much more robust than the 0-10 V
standard, using DALI controls and DALI drivers from multiple manufacturers does
not ensure compatibility or matched dimming performance.
EcoSystem and DALI
provide addressing of individual fixtures and status feedback from the loads, making
it easy to digitally assign occupancy sensors, daylight sensors, time clocks,
manual controls and other controls to one or many fixtures without complicated
wiring. This opens up an entire suite of energy-saving and system-monitoring
control schemes where the design and setup is all done within software, making
the electrical and control design and installation simple. Power is circuited separately
from control wires, so the 120 V or 277 V circuit can be fully loaded, making
electrical design and installation easier.
While digital control of fixtures using the standardized
DALI protocol provides great flexibility and the ability to mix components from
different manufacturers, limitations to the design of the DALI protocol have
led to field problems where DALI components from one manufacturer will not
reliably talk to controls from another, despite both being based on the same standard.
Furthermore, some customerdesired functionality is not built into the DALI
standard, leading to manufacturer-specific extensions to the DALI protocol
which only work when controls and loads from a single brand are used. To avoid problems,
many specifiers choose to stick with DALI components from a single manufacturer.
When compatibility issues arise and multiple manufacturers are involved, it is
difficult to know who to turn to for support.
EcoSystem, from Lutron, enhanced the
standard DALI protocol to allow more digital fixture and control devices (e.g.wall
controls, daylight sensors, occupancy/vacancy sensors) to be used on the data
link.EcoSystem is engineered and tested to guarantee compatibility between
Lutron controls, loads and sensors. This digital control method allows for
guaranteed compatibility and performance, as well as easy re-zoning and
reconfiguring without rewiring during the design, commissioning, and building
lifecycle.
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