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How much do you know about the control system of fire doors?

by:CBM     2021-06-08
The fire door monitoring system is a dedicated system for monitoring the working status of fire doors in buildings, and is an independent subsystem of the automatic fire alarm system.



1 Current status of the engineering application of fire door monitoring system products



1.1 Current status of fire door monitoring system product standards The fire door monitoring system is a monitoring system specifically used to monitor the working status of normally open and normally closed fire doors installed in buildings. It is an independent subsystem of the automatic fire alarm system. In recent years, fire door monitoring system products have gradually been put into use in engineering applications. In order to regulate the production and manufacturing of such products, the national standard GB29364-2012 'Fire Door Monitor' was promulgated and implemented on July 1, 2013. The composition of the monitoring system, the functions of the system components and the inspection requirements have been stipulated accordingly.



1.2. The composition of the fire door monitoring system product According to the working mechanism of the fire door monitoring system and the actual functional requirements of the project, the national standard GB29364-2012 'Fire Door Monitor' stipulates that the fire door monitoring system should be a fire door It consists of a monitor, an electromagnetic release for normally open fire doors, a magnetic switch for normally closed fire doors, and an electric door closer for normally closed fire doors.



2 Misunderstandings and countermeasures in the engineering design of fire door monitoring system



2.1. The scope of monitoring fire doors is not enough. At present, many engineering projects only monitor the normally open fire doors installed in the building, confirm that the normally open fire doors are closed after the fire, and receive the feedback signal of the fire door closure. Monitor the closed state of normally closed fire doors.



Through the investigation of the application of fire doors in engineering projects, it is found that the problem of the failure of the fire doors to close normally due to the damage of the door closers and sequencers is more prominent. Due to the lack of necessary monitoring methods, fire safety management personnel cannot grasp the problems existing on the spot in time, resulting in the failure of timely maintenance of the problematic fire doors, which affects the performance of the fire doors. Therefore, in the actual engineering design, the monitoring range of the fire door monitoring system should include all the normally open and normally closed fire doors installed on the building evacuation passages.



The fire door monitor is a special system for monitoring the working status of building fire doors. Its interface display can more intuitively reflect the use of fire doors. A single control function can achieve reliable control of normally open fire doors. At the same time, fire doors The proprietary functions of the monitor are more in line with the actual needs of fire safety management. Therefore, in the actual engineering design, a dedicated fire door monitor should be selected instead of a fire alarm controller or a fire linkage controller.



2.2. The selection of the fire door monitoring system does not meet the requirements of the fire access system. Part of the engineering design does not meet the requirements of the fire door monitor in the type inspection report to match the electromagnetic release of the fire door and the normally closed fire door. The phenomenon of field components such as magnetic switches and electric door closers for normally closed fire doors.



The performance test of the fire door monitor is completed by matching the manufacturer’s claimed electromagnetic release, magnetic switch or electric door closer and other on-site components. In the type inspection report of the fire door monitor product, the fire door The field components connected to the monitor are described in detail. Due to the different electrical parameters of fire door electromagnetic releasers, normally closed fire door magnetic switches and normally closed fire door electric door closers produced by different manufacturers, the installation of uninspected on-site components in the actual project will affect the operation of the fire door monitoring system Reliability and stability. Therefore, in the actual engineering design process, according to the fire protection product access system and the compatibility requirements of the automatic fire alarm system, according to the matching requirements of the product inspection report, select the electromagnetic release, door magnetic switch or electric switch that has passed the type inspection. On-site components such as door switches.



2.3. Misunderstanding of linkage control logic programming. The linkage control logic programming of some engineering fire door monitoring systems is too complicated. It requires the fire alarm controller and the fire door monitor to communicate in accordance with a specific communication protocol and alarm based on the fire detector. Circumstances determine the scope of the fire door to close, which brings certain difficulties to the specific project implementation. The fire door installed in the building should be able to close itself when a fire occurs. This is the basis for the linkage control logic programming of the fire door monitoring system. Due to the large uncertainty in the development trend of building fires, the building should be closed after the fire is confirmed. All normally open fire doors are installed to play the role of fire doors and fire separation.



Therefore, when designing specific fire door system linkage control logic programming, it is recommended to use the alarm signal of two independent fire detectors or a fire detector and a manual alarm button as the system linkage in a specific fire compartment. When the trigger signal is triggered, the fire linkage controller sends a linkage control signal to the fire door monitor, and the fire door monitor linkage controls all the normally open fire doors set in the building to close the linkage control logic programming design method.
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