Crestron electronic Green Light GLPS-HSW-FT - Manual (Page 7)

Crestron Commercial Lighting Design Guide
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Specifying Crestron Lighting Systems
Specifying Crestron Lighting Systems
This lighting design guide will help you choose the proper Crestron products for your application. A typical lighting system has at least a
lighting control module or cabinet, a processor, and a user interface. Follow these basic steps when navigating through this guide:
1. Survey all controlled lights and loads
Gather information on wattage, voltage, and fixture type. Specify each load as dimmed or switched, normal or emergency, and
central or local control.
2. Choose one or more lighting systems
Use the Product Families section to help you choose. Designate each load to a lighting system. Make sure not to exceed the
maximum load rating for each lighting system.
3. Choose one or more control processors
Use the Processors section. Room Solutions products can work without a processor, but may have limited expansion without
one.
4. Choose one or more user interfaces
For iLux ® and wall box dimmers and switches, a separate user interface is not necessary, but recommended.
5. Add in sensors, shades, and accessories for a more powerful system
Crestron’s Green Light Designer program can help with the design process. Currently, it supports Architectural Dimming, Power
Switching, and iLux systems. For more information see the Green Light Designer Software section.
Cresnet and Ethernet
Throughout the design process, it is important to consider communication between devices. Almost every product in this guide is
capable of connecting via Cresnet. Cresnet is the communications backbone for Crestron systems. It is a simple, bi-directional network
combined with a 24 V power feed. Cresnet allows runs over several thousand feet, and the wiring topology is flexible. Unlike Ethernet,
there is no need for dozens of “home-run” cables – Cresnet can daisy-chain
and home-run.
When designing, try to avoid a large number of Cresnet devices on one circuit. There is a physical limit of 255 devices per segment, but
performance may limit you to far less devices. The acceptable number of Cresnet devices varies with usage and programming
complexity. Performance can be increased by using the Cresnet hubs described in the accessories section of this guide. The PAC2
processor includes several Cresnet segments built-in for high performance out of the box.
Cresnet supplies 24 V power to devices. Power is provided by select processors or a power supply. Insufficient or unstable power will
cause an unreliable system. To help you with the power calculations, a power calculator is available on the Crestron web site.
An Ethernet connection is available on some products, especially touchpanels and processors. Ethernet provides a high performance
connection. Power can be provided with devices that support POE (Power Over Ethernet).
System Architecture
Crestron Green Light systems are available in a variety of configurations. Factors such as construction type, client requirements, and
architectural restrictions determine the best configuration. Lighting system architectures include centralized, distributed, and hybrid.
At the heart of each Green Light system is one or more control processors. This control system takes in user button presses or other
external events and turns them into single commands or even sequences of commands; dimming lights and closing shades can occur
with just one button press or occupancy sense. In addition to controlling lighting, fans, motors, HVAC, and security, the control system
can connect to building systems via Ethernet, RS-232, BACnet, LonWorks, and others.