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Fire Alarm System maintenance and repair

Posted: Sat Apr 01, 2023 3:58 am
by vedard
Fire alarm system consists of many fire detectors and monitoring equipment, drive alarm, automatic fire extinguishing equipment.
Moreover, detectors and fire monitors are installed in harsh and complex environments and may be damaged by environmental factors.
Therefore, the fire alarm system needs regular inspection and maintenance to ensure that it works properly.
Common faults of automatic fire alarm system include: fire detector, communication, main power, backup power, etc. When a fault occurs, you can press the mute button to stop the fault alarm sound and then remove it. If an external control device, such as a detector, module, or fire display panel, is faulty, mark and isolate the device temporarily. After the fault is rectified, cancel the mark and isolation to restore the system.

Re: Common faults of fire detectors

Posted: Sat Apr 01, 2023 4:09 am
by vedard
Common faults of fire detectors:
(1) Fault phenomenon: the fire alarm controller issues a fault alarm, the fault indicator light is on, and the printer prints the fault type, time, part, etc. of the detector.

(2) Cause of failure: the detector and the base fall off and poor contact; poor contact between the alarm bus and the base; Short circuit caused by open circuit or poor grounding performance of the alarm bus; damage to the detector itself; The probe interface board is faulty.

(3) Elimination method: re-tighten the detector or increase the contact area between the base and the detector circlip; Re-crimping the bus so that it has good contact with the base; Find the faulty bus location and replace it; replacement detector; Repair or replace the interface board.

Common faults in the mains power supply

Posted: Sat Apr 01, 2023 4:10 am
by vedard
Common faults in the mains power supply
(1) Fault phenomenon: the fire alarm controller issues a fault alarm, the main power fault light is on, and the printer prints the main power fault and time.

(2) Cause of failure: mains power failure; poor contact of the power cord; The main electrical fuse is blown and so on.

(3) Elimination method: the power should be turned off when the power is continuously cut off for 8h, and then turned on after the main power is normal; Reconnect the main power cord or use a soldering iron to solder it firmly; Replace the fuse or fuse.

Common faults in backup power supply

Posted: Sat Apr 01, 2023 4:11 am
by vedard
(1) Fault phenomenon: the fire alarm controller issues a fault alarm, the backup power fault light is on, and the printer prints the backup power fault and time.

(2) Cause of failure: backup power supply damage or insufficient voltage; Poor contact of the backup battery line; Fuse blowing, etc.

(3) Elimination method: after 24h of power on and charging, the backup power still reports the fault, replace the spare battery; Use a soldering iron to weld the connection line of the backup power to make good contact between the backup power and the host; Replace the fuse or fuse.

Common communication failures

Posted: Sat Apr 01, 2023 4:11 am
by vedard
Common communication failures
(1) Fault phenomenon: the fire alarm controller issues a fault alarm, the communication fault light is on, and the printer prints the communication fault and time.

(2) Cause of failure: the area alarm controller or fire display disk is damaged or not powered on or turned on; The communication interface board is damaged; Short circuits caused by short circuits, open circuits or poor grounding performance of communication lines.

(3) Elimination method: replace the equipment, make the equipment power supply normal, and turn on the alarm controller; Check the communication line between the regional alarm controller and the centralized alarm controller, and replace the line if there are faults such as open circuit, short circuit, and poor ground contact; Check the communication board of the area alarm controller and the centralized alarm controller, and repair or replace the communication board if there is a failure; If communication failures are caused by equipment such as detectors or modules, replace or repair the corresponding equipment.

Major failures

Posted: Sat Apr 01, 2023 4:13 am
by vedard
Major failures:
1. Strong electricity series into the automatic fire alarm and linkage control system
(1) Cause of failure: mainly at the interface between the weak current control module and the starting control cabinet of the controlled equipment, such as roller shutter doors, water pumps, smoke exhaust fans, fire valves, etc., strong electricity occurs in series.

2. Elimination method: an electrical isolation module is added between the control module and the controlled equipment.

Damage to the controller caused by a short circuit or ground fault

(1) Cause of failure: The transmission bus is electrically connected with the earth, water pipe, air conditioning pipe, etc., resulting in damage to the controller interface board.

(2) Elimination method: do a good job of line connection and insulation treatment according to requirements, so that the equipment is separated from the water pipe and air conditioning pipe as much as possible to ensure that the insulation resistance of the equipment and line meets the design requirements.

Repair components

Posted: Sat Apr 01, 2023 4:19 am
by vedard
The parts that are determined to be damaged in the maintenance of automatic fire alarm system need to be replaced and repaired.
There are MAIN BOARD, Screen, BOARD FOR KEYPAD, Addressing board, CAN BOARD, RSA485 BOARD, Switching power supplies, Switching power supplies
repair components.jpg
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