Application of C-Bus Intelligent Lighting Control System in Intelligent Buildings

Abstract: With the rapid development of the information industry and the implementation of the “Green Lighting Project”, the C-Bus intelligent lighting system of Australia’s Qisheng Company has been continuously applied in intelligent buildings. This paper elaborates on the application scope of the system in intelligent buildings.
Keywords: green lighting, C-Bus, energy saving, dimming, scene, programmable, monitoring Currently, with the rapid development of the information industry, the term intelligent system has gradually become familiar with people in Beijing, Shanghai, Guangzhou, Shenzhen. A large number of intelligent building buildings have also emerged in other places. The so-called intelligent building is a computer-based control platform that combines the monitoring of air-conditioning, power distribution, security, communication, broadcasting, lighting, access control, conferences and other subsystems with the organic structure to maximize the use. The requirements of comfort and convenience are to achieve energy saving, efficient management, and rapid information service.

Lighting accounts for a large proportion of electricity consumption in buildings. One of the biggest features of intelligent buildings is energy conservation. Since the quality and level of lighting has become an important indicator to measure the intelligence of buildings - the planning of "Green Lighting Project" After implementation, the intelligent lighting system has become an important part of sustainable development in intelligent buildings. Its level of control also directly reflects the intelligent level of buildings.

Qisheng's C-Bus intelligent lighting control system is an intelligent system based on bus structure, distributed arrangement, which can centrally control, control and monitor all lighting circuits and electric equipment in the building. It can run independently and has a separate control protocol, which is relatively simple compared to the BA system and fully meets the requirements for lighting control.

The C-Bus system consists of three parts: input unit, output unit and system unit:

Input unit: converts the external signal into a C-Bus system signal that propagates on the system bus

Output unit: Receive the relevant command and follow the command to make the corresponding output action

System unit: Provide weak current power and control signal carrier for the system to maintain normal system operation

First, C-Bus intelligent lighting system is mainly used in the following aspects in intelligent buildings:

1. Indoor: indoor office area, public events and meeting rooms: such as offices, halls, parking lots, meeting rooms, etc.

The control functions are as follows:

Lighting scene control

Dynamic and static detector automatic control

Field switch and dimming control

Electric equipment linkage control

Conference system control

Wireless touch screen graphics control

Fire and security linkage control

Computer centralized monitoring

2. Outdoor: outdoor decoration and floodlighting: such as neon lights, floodlights, etc. The control functions are as follows:

Automatic lighting scene control

Lighting timing control, time-sharing, staging, day-to-day, quarterly automatic control

Automatic control based on external light brightness

Computer centralized monitoring

Loop condition monitoring

Lamp life calculation

Second, the C-Bus system in the intelligent building solutions

1. Office area lighting

1.1 staff office area

Due to the large office area of ​​the employee, the entire employee office can be divided into several independent lighting areas, and the scene control switch is used to turn on the illumination of the corresponding area as needed. Due to the large number of entrances and exits, it realizes multi-point control in the office area, which is convenient for personnel to operate. At the entrance and exit, all the lights of the entire office area can be turned on and off, so that it can be conveniently controlled as needed. At the same time, it can be controlled according to time. For example, the car will be turned off automatically at 6 o'clock in the evening. If someone works overtime, it can be switched to manual mode.

1.2 Manager's Office

The manager's office is the main area of ​​the general manager's office and meeting guests. The diversity of functions necessarily requires the diversity of lights to match. Therefore, the manager's office can adopt a variety of adjustable light sources, according to the actual use needs, through the system to preset different lighting and dark lighting, to produce a variety of lighting visual effects, so that the manager's office always maintains the lighting environment that best meets the needs of use. You need to press a scene button to call the desired lighting scene.

For example, when the manager goes to work, just press the “office” button on the control panel of the door, the chandelier in the room, the spotlight in front of the decorative painting, the embedded fluorescent lamp above the desk, and the directional shot at the edge of the column and the wall. The lights can automatically reach 80%, 50%, 70%, and 20% of the illumination, creating a quiet, bright, and dignified effect; after the manager is seated, if the guest visits, the manager just needs to pick up the hand. Press the “Resident” button on the remote control, the chandelier automatically reaches 40%, the spotlight, the cold light source fluorescent lamp in front, the directional spotlight on the column edge, the wall side, and the low-voltage spotlight in the center of the room and the wall in the lamp socket. The lights are 60%, 80%, 50%, 50% and 30% respectively, setting off the style and brightness of the room, representing the friendliness and welcome; during the lunch break, just press the "leisure" scene button, the main room The lighting is completely dimmed, and the trough lights in the lamp trough are adjusted to the appropriate brightness to achieve the purpose of rest. When the manager leaves, press the “OFF” button and the light in the room can be slowly turned off after a few seconds or minutes.

2. Conference room and multi-function hall

The lights on the podium of the multi-purpose hall are mainly downlights and floodlights; the lighting of the audience seats is mainly the ceiling light trough, downlight and pillar wall light. The podium can add stage lighting to meet the needs of the show, and its control is controlled by stage lighting and audio professional equipment. The multi-purpose hall can set up multiple modes according to its function, such as:

Announcement mode: The image of the spokesperson should be highlighted. The brightness of the chairman's downlight is between 70% and 100%. The light-transmitting light is properly turned on so as not to affect the speaker's feeling. The audience is mainly downlights. It is convenient for the participants to record, and the wall lights are all turned on.

Projection mode: The podium only leaves the position of the person to be explained. The brightness of the downlight is 50%. The audience light is gradually brightened from the front row to the rear row, and the wall lights are all turned on. Infrared control of the projector can be added during projection mode.

Discussion mode: All lights are on, and the brightness is 90%-100%.

Admission mode: The audience seat light trough, downlight and column wall light are all turned on, the brightness is 100%, and the brightness of the chairman's downlight is 50%.

Exit mode: the audience seat light trough, downlight and column wall light are all turned on, the brightness is 100%.

Standby mode: The brightness of the chairman's downlight and the audience's headlight are both 70%.

All the above scenes are changed, and the fade time is set to 1-100 seconds. Keeping the scene switch does not affect the progress of the conference and the visual effect.

In order to facilitate the staff to enter and exit the place, the two-button switch is set outside the multi-function hall. When you need to enter, you only need to click the enter switch, and the room automatically turns on some lights to meet the visual effect. When the clearing is over, after closing the door, just click Clear the field switch to turn off all fixtures and electric equipment.

At the same time, infrared control of the projector can be added in the projection mode.

3 auxiliary area lighting

3.1 hall

The personnel enter and leave more time, open the lights of all the circuits in the hall, facilitate the entry and exit of personnel, and the personnel enter and exit for a small period of time to open the lights of some circuits. The lighting control in this area is concentrated in the relevant management room, and the staff controls the corresponding conditions according to the specific conditions. illumination. The operation can be controlled locally by the site or by the central monitoring computer, and time control can also be set.

3.2 Corridors, stairwells and washrooms

With automatic lighting control, the normal working hours are fully open, the non-working time is changed to dimming lighting, and only a small number of lights can be illuminated when there are no holidays. There are manual control switches at each entrance and exit, and the switches of the local lamps can be manually controlled as needed.

Infrared mobile control can be used, people turn on the lights, and people turn off after a delay to save energy.

4 outdoor lighting

4.1 Parking lot and parking lot entrance lighting

Install the C-Bus switch in the garage entrance control for manual control of garage lighting. Under normal circumstances, the garage lighting is under automatic control.

Garage lighting is divided into several states depending on usage: when the vehicle enters and exits busy, the garage lighting is fully open. During the day, due to the daylight, the illumination can be appropriately reduced to save energy. Usually only drive the lane lights. If you need to observe the vehicle, you can turn on the local illumination on the spot and turn it off after delay. The LOADINGDOCK area uses an intelligent motion detection sensor that turns on the corresponding local illumination when someone or the car moves.

Convenient for the management of security and governance personnel. According to the actual lighting and the use of the vehicle, the lighting of the day can be divided into several time periods, such as morning, noon, afternoon, evening, and late night. Through the setting of software, the number of lamps and lanterns can be automatically controlled during these periods. In order to achieve different illumination levels in the control area for illumination, the lighting of the lighting is effectively utilized, the waste of electric energy is greatly reduced, the lamps are protected, and the service life of the lamps is prolonged. If there is an extraordinary need, you can manually turn the illumination on or off with the push button switch in the management room. When the requirements of automatic control are met, the system will automatically return to the state of automatic operation without manual reset.

4.2 Building outdoor landscape lighting

Landscape lighting refers to the night illumination of buildings, which is the use of various light sources and lamps to produce different effects, combined with the characteristics of the building and the surrounding environment. Create the same moving effect of the building at night as during the day.

The traditional landscape lighting control uses an outdoor power distribution box and installs a common timer to achieve the effect of turning on and off the light, which is considered for the accuracy of control, the convenience of operation, and the flexibility of the change. It is far from being able to adapt to the standards and requirements of today's intelligent buildings. The C-Bus system can fully meet the above requirements in terms of control.

When the building area is large, the outdoor landscape lighting is scattered. In order to save a large number of strong electric cables, the principle of close setting is adopted. Combined with the strong electric distribution box, the C-Bus relay unit is used for control, and the C-Bus elements of all nearby areas are controlled. The device is connected by a UTP5 line and merged into the nearest C-Bus network. Through the optical fiber broadband information transmission, a graphical monitoring interface is established on the central monitoring computer, which can manually control the opening and closing of each lighting circuit in the field. The method of writing the whole landscape lighting timing program is divided into normal lighting scene, holiday lighting scene, and major event lighting scene. When the daily lighting scene is automatically turned on, it is divided into 18:00, 20:00, 22:00, 00:00, 07:00 five hours of lighting control effects, all processes are automatically controlled by the computer, eliminating a lot of manual operations, increasing the accuracy of control, and a good graphical monitoring interface, when temporarily opened, only need to be on the computer interface Just do it. On the output components in the C-Bus distribution box, manual on-site switching control can be performed, even if the bus fails, it will not affect the normal operation of landscape lighting. Through this control method, the waste of electric energy is effectively reduced, and the running cost is reduced.

Third, the overall effect of using C-Bus intelligent lighting control system

The most important thing of intelligent building is its advanced and practical. The specific functions can be regarded as the use of diversified information transmission, the building is fully monitored and managed, reflecting integrated integration, resource sharing, and realizing the “Green Lighting Project” plan.

As part of the intelligent building intelligent system, intelligent lighting reflects the energy saving, efficiency, safety and comfort required by the “Green Lighting Project” from all aspects.
Easy installation and cable saving
The C-Bus system is a two-wire lighting control system that uses a pair of UTP Category 5 lines as the control bus to connect the various inputs, outputs and system support units in the system. The large-section load cable is output from the output unit. The output is directly connected to the lighting fixture or other electrical load without going through the switch. It is not necessary to consider any control relationship during installation. After the whole system is installed, the address code of each unit is set by C-Bus software to establish the corresponding control relationship. Since the C-Bus system only uses the load cable connection between the output unit and the load, it saves a lot of cables that would otherwise be connected to the switch compared with the conventional control method, and also shortens the installation and construction time and saves labor costs.
The C-Bus system can remotely control and centrally monitor the entire lighting system through the computer and C-Bus control software, and can easily modify the control relationship according to user needs at any time. The programmability provided by the C-Bus system is highly adaptable to possible changes in the future. When it is necessary to change the lighting control relationship for some reason, it is only necessary to modify it in the software without re-laying the cable.

3. Improve work environment and improve work efficiency

In the office of the building, fluorescent lamps with dimmable electronic ballasts have significant advantages over traditional fluorescent lighting systems under the control of the C-Bus intelligent lighting control system.

Because the fluorescent lamp with the traditional ballast flashes at a frequency of 100 Hz, this strobe makes the staff's mind swell, the eyes are tired, and the work efficiency is reduced. The dimmable electronic ballast works at very high frequencies, not only overcomes the flash frequency, but also eliminates the unstable brightness, healthy and comfortable environment caused by the use of START, and also improves the work. Efficiency, but this brings an unexpected huge economic back to the owners.

4. Save energy and reduce operating and maintenance costs

Because the C-Bus system uses infrared sensors, brightness sensors, time switches and dimming technology, the intelligent operation mode enables the entire lighting system to operate accurately according to the cost-effective and optimal solution, which not only greatly reduces the operating cost. And to maximize energy savings, compared to traditional lighting control methods, can save 30% of electrical energy. We conducted a comparative measurement on two floors with almost identical electrical loads in the Lerto Building in Australia, with one floor installed with the C-Bus intelligent lighting management system and the other with traditional lighting. The results show that the floor with the C-Bus system saves 2,310 kWh per month, and at AUD$0.19 per kWh, it saves $438.20 per month, which allows for two and a half years to recover.

5. Long-term, considerable potential gains

C-Bus also adopts soft-start and soft-shutdown technology, which can make each load loop start and shut down slowly in a certain period of time, or start and shut down at a short interval to avoid damage to the luminaire caused by the impact voltage. Extends the life of the luminaire. At the same time, the C-Bus system is open, providing interfaces and software protocols that are connected to the BA system to facilitate the formation of a complete building automation system. Buildings using the BA system, if the C-Bus intelligent lighting management system is also used, bringing a high-quality lighting environment, will improve the intelligent management level of the entire building, increase the highlights of the property, for the fine works and The iconic architecture gives modernity, intelligence and a sense of the times, which undoubtedly have many potential benefits.

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