【 Weak current College 】 detection method for intelligent building system

Intelligent building using advanced computer technology, control technology, communication technology, as users and managers provides the control functions, data processing, display the operation set, run the secure and reliable construction equipment automation systems (Building Automation System called BA system). BA system uses a distributed control technology for construction equipment to conduct a comprehensive, real-time monitoring, improving the quality of building equipment, reducing the management workload, reduce energy consumption in buildings, in building intelligent systems in which an important role. However, the long-term quality of systems engineering in China has not BA, BA of normal operational system, which is mainly due to the detection of BA systems engineering and acceptance has not yet been established on the basis of the science.
Over the past three years, we in line with the Government and the owners of the intellectualization systems engineering completion approval work successively on Shanghai jiushi Renaissance buildings, and telecommunications training building, Shanghai tongmao building, public building, Shanghai Pudong Development Bank building, no. 12, Bund Zhaofenghuanqiudasha, Zhao Feng world trade building, stock building BA system detection. On the BA system monitoring of power supply system, cooling system, air-conditioning system, lighting system, water supply and drainage systems, garage management systems for detection, real-time BA systems, reliability, security, ease of operation, easy maintenance, control, precision, and other important indicators as a system for evaluation. This work contributed to BA systems engineering contractors to the correction and improvement the quality of the project, not only achieved good social benefits, and the results of the work has been included in Shanghai in the intelligent construction series standards sent for approval.

1. about BA system detection methods
BA systems detection work first according to the project design document and contract technical file a complete view of the whole system's features and performance indicators. The detection system owner and the contractor must provide the main files a system selection, system scale capacity, control, process description, description of system functions and performance indicators, BA system chart, each subsystem control schematics, BA system equipment layout and wiring diagrams, and BA-system monitoring-related power distribution box electrical schematics, on-site equipment installation diagrams, DDC station and central management station/operator station monitoring program flowchart, central control room equipment layout, BA system supply contract and project contract, BA system construction quality inspection records and related engineering change orders, BA systems run record. On this basis, according to BA system acceptance criteria, develop a reasonable BA system detection scheme.
Testing is generally divided into three levels: central monitoring station, subsystem (DDC) and field devices (sensors, transmitters, implementing agencies, etc.) for feature detection.
1.1 central monitoring station inspection
Central monitoring station is on the premises each subsystem of DDC station data acquisition, refresh, control, and alarm central processing unit. Detection project are as follows:
In the central monitoring station observation Site status change, central monitoring station on-screen status data is constantly being refreshed and their response time;
Through central monitoring station control subordinate system simulation output or digital output, observation field enforcement agencies or if the object is valid and correctly, action action response returns a central monitoring station;
Human input in DDC station side manufacturing fault, the observation in the central monitoring station screen for alarm and fault data landing audible cues and their response time;
Artificially create a central monitoring station outage, regaining power transmission, the central monitoring station can automatically recover all monitoring and management capabilities;
Detecting whether a central monitoring station for operations personnel to give permissions to ensure the safety of BA system. Should illegal operations, ultra vires actions of rejection, to confirm;
Man-machine interface is finished, the central monitoring station screen to display the query, control equipment, observation equipment shipped processes is intuitive and easy to operate, to prove that the interface friendliness;
Detection of central monitoring station has the status of the device group self diagnosis function;
Detection of central monitoring station monitor and the printer is unable to report graphics and trends, to provide all or significant equipment running time, regional, and state information;
Detection system is provided for system design, applications, creation of graphics software tools;
Detection of central monitoring station is located in the control object parameters, and the scene is measured object parameters are consistent with the design of precision;
Detection of central monitoring station displays all devices running data is complete and accurate.
1.2 subsystem testing
Subsystem (DDC) is an independent run (slave) computer control system, on the scene a variety of sensors and transmitters of process signals in the ongoing collection, computing, control, alarm, etc., through the communications network to the (PC) central monitoring station database for central monitoring station for real time display, control, alarm, print, etc.
Testing subsystem project as follows:
Artificially create a central monitoring station downtime, the observation of various subsystems (DDC) works correctly;
Artificially create subsystem (DDC) lost power, the back transmission, subsystem can automatically recover lost power before setting the status of the operation;
Artificially create subsystem (DDC) and central monitoring station communication network outages, on-site equipment is up and running of automatically, and the central monitoring station for DDC station high line fault alarm signal login;
Testing subsystem (DDC) clock with central control station clock synchronized to the central monitoring station to various subsystems (DDC) monitor.
1.3 on-site equipment testing
Depending on the system design monitoring requirements, electrical signal into analog and digital content. Sensor and transmitter is the various physical (temperature, humidity, pressure,Flow, the electric valve to open degree, level, voltage, current, power, power factor, running, etc.) into the corresponding signal device. Executive agencies are based on the DDC output control signal for the work of the device. On-site equipment testing project as follows:
Check the field of sensors, transmitters, implementing agencies, DDC box installation specifications and reasonable, easy to maintain;
Detection of central monitoring station the displayed data, status and field readings, State;
Testing actuator action or action sequence is consistent with the design process;
When the parameter exceeds the allowable range, whether to generate alarm signals;
In the central monitoring station under the control of the executing agency actions properly.
1.4 feature detection
BA system for building equipment monitoring is usually completed by function and region. Therefore, the detection is based on a regional basis. With air conditioning and public lighting range, for example. Air conditioning zone is a place of work, rest, under the control of BA system, air-conditioning system should ensure a comfortable indoor temperature and good air quality. Detection of air conditioning and public lighting area are as follows:
Detection of central monitoring station on the air conditioning system control is carried out according to the schedule;
Testing air conditioning zone temperature, humidity and the central monitoring station display data match;
Detect whether indoor CO2 content meet the health standards;
Detection can, under time, control of public lighting area light switches and set lighting at night, in order to achieve the purpose of energy saving.
Through the above three levels and function, can real-time on BA systems, reliability, security, ease of operation, easy maintenance, equipment installation quality, control, precision made comprehensive evaluation, on the forth of problems. By rectification to be detected by the system to function correctly BA.
In BA systems engineering testing, always will find a lot of questions, after a certain time after rectification, most basic line with BA system project design documents and the contract technical features and specifications, system operation is good for certain energy saving effect. Detection of qualified BA system for building equipment monitoring, detection, control and warning of responding fast in real time; a high rate of Chinese operation interface, easy operation and maintenance, and have the device integrated management; system to manipulate staff permissions control strictly, level clear; systems work reliably; air conditioning zone control precision air conditioning system design requirements can be met.
In BA system testing usually there are some problems, mainly because there are several ways.
First, a small number of building professionals, HVAC and electrical professional designers at design time in the early expansion did not meet, as well as air conditioning tank room space is too small, it is difficult to walk on the maintain channel. Or new outlet location settings are not reasonable, outdoor air quality is not ideal.
Second, some BA designers on construction equipment are not familiar with, the integrity of the system does not understand that sensor location device error or even system lacks proper sensor and software tools.
Third, a few BA designers on air conditioning system operating and technology understanding not comprehensive, BA system for air conditioning system control mode is not reasonable, does not meet the goal of effective energy-saving.
Fourth, some construction personnel in the installation process, do not follow the specification, connection error, the sensor is installed in the wrong place, implementing agencies and device connection is not secure, DDC inside wiring mess, box and out of line without protection rubber gaskets, metal hose out la, to bring the system up and running.
Fifth, a property management company fails to run in BA system, make the necessary maintenance, leaving the original normal system ever fails.

3. concluding remarks
Intelligent building set BA systems are designed to provide comfort, health, safety, fast and quality services, energy and labor costs, the establishment of scientific management mode. To achieve the goal of building, needs engineering, construction and management of common efforts and hard work. With the development of science and technology, as a smart building technology pillars in building automation system technology will continue to progress, at the same time through the detection of BA systems will generally improve the quality of Chinese BA systems engineering.