Modern office buildings, hospitals, shopping malls and the application of intelligent building systems are inseparable
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Intelligent building control system participates in many units, including air conditioning and cold and heat source system, water supply and drainage system, lighting system, power supply and distribution system, parking management system and access control system
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The following main details about the conventional intelligent building system including air conditioning and cold and heat source system, water supply and drainage system construction problem analysis
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The system architecture of this system is that the central control platform sends the control command through the network, sends the command to the network module of DDC single module control box, then the network module executes the corresponding function module through the internal programming program to output, and the output command is sent to the front end actuator or equipment control box through the signal line, so as to complete the whole control command
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The way of feedback instruction is opposite
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1、 It is clear that the wire used in the construction wire intelligent building system is actually related to the signal of the controlled detection equipment
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In this system, there are no more than two kinds of signals, one is digital signal, the other is analog signal
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Digital signal is a kind of physical quantity, which is discontinuous in time
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Generally, it can be understood as two states of on and off (i.e
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1 and 0)
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Therefore, the signal is rarely interfered by electromagnetic and radio waves from the external environment
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Generally, unshielded wire, RVV type and RVs type, is selected; Analog signal is a kind of continuous physical quantity, generally including voltage signal and current signal
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In the above two subsystems, RVVP type and RVSP type shielded wires are generally selected, which are vulnerable to electromagnetic interference, and the communication distance should not be too long (generally controlled within 25m)
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The operation status, fault status, automatic status and start stop control of air conditioning (sewage pump, forced draft fan) are digital signals, which are generally in the air conditioning control cabinet
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Rvv8 * 1.0 (or rvv8 * 0.5) wire can be selected
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The above wires are used from the equipment to the control module, and the DDC box to the system control platform is transmitted through the network
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The super class 5 network cable or optical fiber is selected
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2、 The node control of the intelligent building system is very important in the construction process, because the system can not complete all the work at one time, and the construction of the controlled equipment is not completed, so the construction of the system can not be done in advance
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The whole construction process has four points: wiring, installation of equipment and wiring, commissioning, acceptance
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1
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After wiring or entering the site, we should communicate with the mechanical and electrical department whether the air conditioning control box, forced draft fan control box and sewage pit control box of the controlled equipment of the system have secondary loop state and control (operation state, fault state, automatic state and start stop control) dry contact, It is necessary to negotiate with the mechanical and electrical department before the control box manufacturer delivers the goods
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2
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Determination of air conditioning front-end equipment if the controller of air conditioning front-end is not provided by the construction company, the construction company needs to determine with the air conditioning installation company whether the controller is consistent with the type required by the system design
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For example, whether the water valve actuator is the required analog adjustable type, whether the damper actuator is the analog type, and whether the quantity of controlled equipment is consistent with the contract quantity
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If the controller does not meet the requirements of the system, negotiate with the supplier to replace it, otherwise the follow-up system functions cannot be realized, and the work is in vain
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3
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In fact, system debugging is an important link of the whole system
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This link is the link to check the construction results and system functions
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When is this link? It is: DDC box module wiring is completed and the power supply is normal (no power on); The bus communication between DDC boxes is normal; The commissioning of controlled electromechanical equipment (air conditioning unit) is completed and works normally; The system network communication is smooth
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When these four points are reached, the system testing and debugging can be started
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4
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Confirm the acceptance node, after the commissioning of the system, if there is no problem after the trial run for a period of time, contact the manufacturer’s personnel, Party A’s personnel, and Party A’s users as much as possible, so as to facilitate the operation and maintenance of the manufacturer’s personnel training system
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The whole intelligent building system may deal with many departments in the process of implementation
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After all, the system is not a separate system, with a wide working interface and more participating devices
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Only in this way can the equipment of the whole building be integrated into one through the system, so that they can work together, save human resources for the operation unit, and facilitate the overall management; To provide a convenient and comfortable environment for our work and life
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About the author, about the project cooperation, about the communication group, I’m the author, Dabai, first-class constructor, senior engineer
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Now he works in a construction enterprise in Nanjing, and runs the official account in his spare time
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My company qualifications are: Highway mechanical and electrical engineering level, electronic and intelligent level, city and road lighting level, project cooperation can find me, all kinds of cooperation mode can
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If you want to join the wechat communication group of weak current industry, please increase the number of white wechat friend 58720961
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