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Lighting Research Program. Program Advisory Meeting Project 5.4 DALI Lighting Control Device Standard September 16th, 2004 Funded by California Energy Commission's Public Interest Energy Research (PIER) Program. DALI Controls Standard Development.
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Lighting Research Program Program Advisory Meeting Project 5.4 DALI Lighting Control Device Standard September 16th, 2004 Funded by California Energy Commission's Public Interest Energy Research (PIER) Program
DALI Controls Standard Development • Concept: DALI (Digital Addressable Lighting Interface)is an open protocol providing dimming control down to the individual ballast. Extending the standard to include control devices would accelerate the use of fluorescent dimming systems in commercial and institutional applications making lighting a controllable load. This, in turn, would support the PIER Goal of improving the reliability and quality of California’s electricity . • Strategy: • Assess market needs/barriers and DALI’s fit • Team with NEMA to develop protocol, draft standard and guide IEC approval process • Demonstrate/promote combined ballast and controls Specific Device Commands General Requirements Testing Certification
Lighting Controls Market Assessment • Current Practice: Occupancy sensing and scheduling systems dominate, driven by energy savings and code compliance. Both of these technologies are accepted as effective and relatively problem free. • Major Improvements:Specifiers identified low-cost electronic dimming ballasts and industry standard controls protocol as the two improvements having the greatest impact on lighting control. • DALI Perceptions: Focus groups responded positively to occupant control, daylighting, re-configurable spaces and the ability to identify lamp failures…DALI strong points. However, user-friendly operation, simplicity and reliability were top concerns behind cost.
DALI Fit to Needs: Energy Reduction • Efficient Dimming: since energy savings remains a primary concern, the relative light vs. power of ballasts from multiple vendors must be confirmed. • Occupant Sensitive Strategies: dimming and addressability, increase the effectiveness of several key strategies: tuning, daylighting and demand shed. Turning allows the lighting in each space to be set to the occupant’s preference. Daylight harvesting can be linked to specific fixtures overcoming the problem of rows perpendicular to the window wall. The ability to determine the light level of each fixture, reduce it by a set percentage and then use this reduced level as a maximum is ideal for demand reduction.
DALI state of the art shortcomings • No agreement on device types and how each will work: • Operation of control devices is fixed • Control settings can not be centrally monitored or changed • No annunciation of control device failures.. • No collision management protocol • No control-specific commands • Multiple device scenario conflicts
DALI Control Standard Technical Strategy • DALI ballast base: Retain electrical, wiring, 2-byte message structure for communication to ballasts. Ballast commands unchanged. • 3-byte control messages: Messages to control devices use 3-byte structure, which is ignored by the ballasts • Collision management: Control devices listen before speak. Five priority levels. • Distributed, intelligent, programmable, addressable devices with command sets. Minimum and full functionality. • Parameter banks: Allows control scenarios to change as a function of external conditions. Major feature.
DALI Parameter Bank Concept Occupancy Sensor Parameter Banks Other… Daylight Compensated Scene Switch Room Combine
DALI Demonstration Sites: Validate & Promote • East and West: DALI systems are being installed in two demonstration sites allowing ballasts and controls from multiple vendors to be operated on the same bus. • Open house Warwick, RI September 28th: NEMA Joint Sections on DALI with participation by the major ballast and DALI controls manufacturers. • Open house Santa Clara, October 12, 10:00 am: Specifier focused presentation. Review of cooperative effort with NEMA.
DALI …What’s a Product Line Manager to do next? Develop DALI Controls Platform: Software, hardware, commissioning tools and service capability. Low volumes discourage major investment Strategic Alternatives: • Focus on architectural vs. energy based dimming. Go after the low hanging fruit. Increase package value. • Code require ability to shed lighting loads on a relative basis. “Shed xx% of the current lighting load based on a contact closure” • Other? The central question…”How do you grow the base?”
