Lighting management

Currently LED lighting design is a standard in redevelopments of lighting systems. Unlike old lamps from the 1970´s, just replacing the lighting system with modern LEDs can save up to 65% of electricity costs.

Each lighting system must be designed to be oversized so that the luminaires are able - even subject to gradual aging - deliver at least the minimum required amount of light according to ČSN EN 12464-1.

In the beginning of their lifetime, luminaires operate at higher output than necessary resulting in an unnecessary waste of electricity and shortening the life of luminaires. In addition, if there are windows/skylights in production halls/rooms, the luminaires performance can be further reduced by the semi-darkness of the daylight.

Here the lighting control system is important, which allows for controlling the luminaire system to a constant value of lighting read from lighting sensors located in a given space; therefore, the luminaires will not have to be operated at maximum power, which extends their service life and saves energy. In addition, it is possible to monitor the status of individual luminaires, group them into virtual rooms, set time diagrams, control lighting according to motion sensors, wireless controls, etc., thereby saving extra costs for controlling, servicing and maintaining lighting systems.

Technical characteristics lighting-management

Currently, DALI (Digital Addressable Lighting Interface) is used for intelligent light control. The DALI bus is two-wire and can have any topology. It does not require a shielded cable and can therefore be routed in the free wires of the power cable used to power the luminaires. Thus, it is not necessary to bring another cable for communication to the luminaires. For example, the CYKY-J 5x1,5 cable is used, where 3 cores are used to power the luminaires and the other 2 are used for the communication. At the end of the DALI bus, the voltage shall not drop by more than 2V, which corresponds to a distance of 300 m for a cable cross-section of 1.5 mm2.

One DALI bus can connect up to 64 luminaires that communicate with the master unit. Each luminaire has its own DALI address and is possible to communicate with it separately. Up to 10 of these master units can be connected to one lighting control system, i.e. up to 640 DALI luminaires can be controlled. Individual control systems can be connected to each other via the Ethernet network to control the theoretically unlimited number of luminaires.

The DALI communication-supporting luminaire incorporates the DALI lighting ballast and such a luminaire execution is commonly available with most luminaire manufacturers.

In the latest DALI bus specification, also known as DALI2, it is also possible to connect light sensors, buttons and PIR sensors to this bus. This will further reduce required cabling. The number of connected sensors per a DALI bus is determined primarily by their current consumption, which in sum must not exceed 200 mA.

In addition, the lighting control system supports Enocean wireless elements, which is a battery-free technology that sends multiple short telegrams, sending of which only requires very little power. For energy generation, transmitters use electrodynamic energy converters or photovoltaic cell power. They are absolutely maintenance-free because they do not contain a battery, just a maintenance-free capacitor. Benefits of this technology include the high range of wireless signals (30 meters in buildings and 50 meters in production halls) and reliability, which is given by sending each telegram three times. These elements can be used, for example, to install buttons for controlling lighting without a need for pulling the wiring, which makes it possible to add buttons even to a completed installation.

The lighting control system allows for grouping any luminaires into any virtual rooms, controlling these rooms at a constant level of lighting, switching them according to PIR sensors, buttons, time schedule (public holidays, working time). The creation of virtual rooms is very advantageous in production halls, where layout changes. Here you can change the layout of the light sections using virtual rooms without any interference with the physical connection of the luminaires.

The lighting control system is usually located in a switchboard that powers the lighting system. Using the Ethernet cable, it is possible to connect individual control systems to each other, which makes it possible, for example, to switch sections controlled from various switchboards just using one button. Another option is the Modbus TCP/IP protocol link to the parent SCADA application, which can be located in the central control room, it can be accessed via the Internet as well via smartphones, tablets, etc. This application provides you with an overview of the lighting, its status and settings, the faults of individual luminaires and many other features