1. The composition of the automatic fire alarm system. The setting form of the automatic fire alarm system is different, and its system composition is also different. The setting form is generally divided into three types: regional alarm system, centralized alarm system and contr

1. The composition of the automatic fire alarm system

The setting form of the automatic fire alarm system is different, and its system composition is also different. The setting form is generally divided into three types: regional alarm system, centralized alarm system and control center alarm system. The composition of the system is introduced as follows:

1. The composition of the regional fire alarm system

. The area fire alarm system should generally be composed of a fire alarm detector, a manual alarm button, an alarm that can emit sound and light alarm during fire, an alarm line transmission module, a control module, and an fire alarm controller that can control and display the entire system. There are also graphic display devices and an area display on the floor ( fire display disk ).

2, the composition of the centralized fire alarm system

, the centralized fire alarm system should include a fire alarm detector, a manual alarm button, an alarm that can emit sound and light alarms during fire, an alarm line transmission module, a control module, a fire special telephone, a fire emergency broadcast, and (CRT) graphic display device, a fire alarm controller, and a linkage controller that requires fire linkage.

3. The composition of the fire alarm system of the control center

. The composition of the fire alarm system of the control center is basically the same as the composition of the centralized fire alarm system, except that it requires two or more fire alarm controllers, and some even have two or more fire control rooms . When there are two or more fire control rooms, one must be determined as the main control room. The main control room should be able to display the signals of all fire alarms in the system and the status signals of the linkage control equipment on the controller, and should be able to control important fire equipment in the system; controllers in non-main control rooms should be able to transmit fire equipment signals to each other and display the status information of fire equipment, but they should not control each other.

2. Functions of the fire automatic alarm system

Fire automatic alarm system generally has the function of fire detection alarm function and the linkage control equipment operation function. It can promptly and accurately inform the building personnel of fires and fires there. At the same time, it can start the fire protection facilities in the fire area and start the water supply equipment through the linkage control system, providing us with a reliable guarantee for extinguishing the fires in a timely manner.

1 and fire detection alarm system fire alarm function

buildings installed with fire detection alarm system. When a building occurs, fire detector in the fire area transmits unique information about the fire field such as smoke, heat and light radiation generated in the fire area to the fire alarm controller set up in the fire control room, or manually alarm the fire alarm controller of the fire control room through the manual fire alarm button; the fire alarm controller is signaled by the detector or manual button, and after determining whether it is a fire, it also displays the alarm location, equipment, alarm time, etc., and issues a fire alarm sound to the personnel in the building to remind people in the protected area to warn of the occurrence of the fire and take fire extinguishing and evacuation.

2, function of fire linkage control system

When a fire occurs in a building, the alarm signals issued by the fire detection equipment and the manual alarm button are transmitted to the linkage controller set in the fire control room. It judges the received fire alarm signals according to the logic of the setting. When the fire alarm logic relationship is in line with the set fire alarm logic relationship, it will start the corresponding fire fire extinguishing system set according to the program to realize the fire extinguishing function. At the same time, the personnel on duty in the fire control room can also manually start the fire protection equipment in the fire area. The system should be able to accept and display the system's startup and operating status and information feedback.

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3. Key points for troubleshooting of fire automatic alarm system

To understand the key points for troubleshooting of fire automatic alarm system, we must first deal with high-definition issues of fire automatic alarm system in daily life.Common faults in general systems are mainly equipment and lines, including fire detector equipment and lines, communication equipment and lines, main power equipment and lines, backup equipment and lines, etc. When a system fails, the controller will issue an alarm sound. The door can first eliminate the fault alarm sound, and then search and troubleshoot on-site. If the external control device of the controller fails, the faulty device can be shielded and isolated first, and then the shielded and isolated after verification with the cause and repairing it intact to restore the alarm system to normal.

(I) Common faults and methods for handling 1. Common faults of fire detectors

Common faults of fire detectors: system has a fault alarm and an alarm sound is emitted, and the fault indicator light is lit, and the type of detector failure, when and where, etc. are printed out. Common causes of fire detector failures: detector damage; poor contact with the detector and the base; poor bus contact; break or short circuit of the alarm bus; faulty interface board. Common troubleshooting methods for

fire detectors: replace the bad detector; retighten the contact reed between the detector and the base; re-crimp the alarm bus; find out the open or short-circuit bus position, replace or repair; replace the bad interface board or repair the bad interface board.

2. Common faults of main power supply

Common fault phenomena of main power supply: fire alarm controller produces a fault alarm and emits an alarm sound, and the main power failure on the controller host is lit. Common causes of failure of

main power supply: the main power cord may have poor contact; the city power supply system is out of power; the main power supply wire is fused, etc. Common troubleshooting methods for

main power supply: reconnect the main power cord or use a soldering iron to solder firmly; when the urban power supply system is out of power for more than 8 hours, the power should be shut down, and then restarted after the urban power supply is restored; the main power supply fuse or fuse is replaced.

3. Common faults of backup power supply

Common fault phenomena of backup power supply: fire alarm controller produces a fault alarm and emits an alarm sound, and the backup power failure light of the alarm controller is lit. Common causes of failure of

backup power supply: Battery wiring used as backup power supply may have poor contact; battery used as backup power supply is damaged or battery voltage is insufficient; fuse of backup power supply is blown, etc. Common troubleshooting methods for

backup power supply: solder the connection wire of backup power supply to make it in good contact; charge the backup power supply, and the system still reports a power failure after 24 hours of charging, which means the battery is damaged, and the backup battery should be replaced; replace the fuse or fuse tube at the connection wire.

4. Common communication faults

Common communication fault phenomena: fire alarm controller produces a fault alarm and emits an alarm sound, and the communication fault light of the controller is lit. Common causes of

communication failures: fire display disk (area alarm controller) is damaged or not powered on or powered on; the interface board of the communication system is damaged; short circuits, circuit breakers, and short circuits caused by poor grounding . Common troubleshooting methods for

communication: If the fire display disc is damaged, the fire display disc should be replaced. If the power is not turned on, powered on and powered on; check the communication line of the system to see if there are short circuits, circuit breakers, or poor grounding. If there is, replace the circuit with problems in the system; check whether the communication interface board of the system is damaged. If it is damaged, repair or replace the communication interface board immediately; if it is faulty due to equipment, the equipment should be replaced or repaired.

(II) Major fault

1. Strong electric series entry system

The cause of strong electric series entry system: is mainly the interface between the start control cabinet of the controlled equipment and the weak current control module, such as the anti-smoke exhaust fan, water pump, fire valve, roller shutter, etc.Troubleshooting methods for

strong electric serialization system: takes technical measures to add an electrical isolation module between the controlled equipment and the control module.

2. Controller damage caused by short circuit or grounding fault

short circuit or grounding fault Cause of controller damage: The transmission bus of the controller is connected to air conditioning pipes, water pipes, ground, etc., resulting in damage to the controller's interface board.

Troubleshooting controller damage caused by short circuit or grounding fault: try to isolate the controller equipment from air conditioning pipes, water pipes and other conductors, and handle the connection and insulation of the circuit well to ensure that the insulation resistance value meets the specifications.

(III) Causes of false alarm system of fire automatic alarm system

1. The product quality of the fire detector is unstable, causing dust, steam, etc. to affect the detector, resulting in false alarms;

2. The selection of the detector is inaccurate. For example, select a fire detector with low sensitivity in an environment that does not produce high concentration smoke;

3. False alarms are generated due to environmental factors: electromagnetic environment interference; airflow can affect; the temperature sensing is too close to the high temperature source, the smoke sensing is too close to the air supply port, and the temperature sensing is installed in places where there is water vapor for a long time, etc.

4. Other reasons: the system grounding is not done or the line insulation does not meet the specifications; the detector's components are aging; the impact of dust and insects on detection; the detector is damaged.