Timers &Controls ●From previous page
The chosen DALI controller can address devices individually or by multicast. Each device can be assigned to up to/any of 16 groups and can store up to 16 scenes that can be controlled by a single command. Just like computer networks, the ballast with the right address picks the message up and follows the instruction: it might be ‘turn all the lights in the corridor on’, or it could be ‘switch to the theatre lighting scene in the conference room’. Knowing the basics makes a world of
difference when making a decision – do you want to light several multi-function rooms that require different lighting options depending on time of day, usage, etc? If so, consider DALI control with the new Timeguard range.
Daylight harvesting There are, of course, cases and places where ordinary lighting is fine, and where dimming, occupancy control or individual user control isn’t the answer. However, there are few new commercial installations that won’t benefit from constant monitoring and adjustment to balance the maintenance of comfortable and healthy light levels for occupants with energy efficiency. And now, daylight harvesting that is typically associated with DALI is now available in stand- alone PIRs.
Building codes and good practice increasingly identify the need to provide daylight, yet there are currently no minimum legal requirements associated with daylight in the UK, according to the Building Research Establishment. The UK has informative codes and standards, similar to most nations, requiring “sufficient”
Side view
Office interior
daylight or illumination without mandatory levels being defined. For instance, 300 lux at a workstation is generally accepted, and the CIBSE (the Chartered Institute of Building Services Engineers) publishes detailed guidance. With daylight harvesting, installers are able to
offset the amount of electric lighting needed to properly light a space, in order to reduce energy
Head view
consumption using lighting control systems that are able to dim or switch electric lighting in response to changing daylight availability in ‘real time’. And the new Timeguard PIRs, when used as stand-alone devices, provide daylight harvesting capability for any installation.
timeguard.com
In a traditional system, control signals are one-way. In a DALI system, signal traffic is two-way, meaning LEDs can be
commanded to perform requested actions, such as switch ON/OFF or DIM, but can also be asked to provide information.
24 | electrical wholesalerDecember 2018
ewnews.co.uk
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