The fire-fighting equipment power monitoring system is developed according to the national standard “Fire-fighting equipment power monitoring system”. The main power supply and backup power supply of the fire fighting equipment are detected in real time, so as to determine whether the power supply equipment has overvoltage, undervoltage, overcurrent, open circuit, short circuit and lack of phase faults. When a fault occurs, it can quickly display and record the location, type and time of the fault on the monitor, and issue an audible and visual alarm signal, thus effectively ensuring the reliability of the fire-fighting linkage system when a fire occurs. In recent years, many large-scale places, such as commercial residences and entertainment places, have installed fire-fighting equipment power monitoring systems or fire hydrant systems, foam fire-extinguishing systems, etc., mainly to ensure the fire safety of buildings. So, how much do you know about the power monitoring system of fire equipment? The following Xiaobian will introduce the main functions, installation requirements, construction technology and common faults of the power monitoring system for fire equipment.
Main functions of power monitoring system for fire fighting equipment
1. Real-time monitoring: the value of each monitored parameter is in Chinese, and various data values are displayed in real time by partition;
2. History record: save and print all alarm and fault information and can be queried manually;
3. Monitoring and alarming: display the fault point in Chinese, and send out sound and light alarm signals at the same time;
4. Fault quotation: program fault, communication line short circuit, equipment short circuit, ground fault, UPS warning, main power supply undervoltage or power failure, fault signals and causes are displayed in the order of alarm time;
5. Centralized power supply: Provide DC24V voltage to field sensors to ensure stable and reliable operation of the system;
6. System linkage: provide external linkage signals;
7. System architecture: accompany with the host computer, regional extensions, sensors, etc., and flexibly form a super-large monitoring network.
Installation requirements for fire-fighting equipment power monitoring system
1. The installation of the monitor should meet the requirements of the relevant specifications.
2. It is strictly forbidden to use the power plug for the main power lead-in line of the monitor, and should be directly connected to the fire power supply; the main power supply should have obvious permanent signs.
3. Terminals with different voltage levels, different current categories and different functions inside the monitor should be separated and clearly marked.
4. The sensor and the bare live conductor should ensure a safe distance, and the sensor with bright metal should be safely grounded.
5. The sensors in the same area should be centrally installed in the sensor box, placed near the distribution box, and reserved for the connection terminals with the distribution box.
6. The sensor (or metal box) should be independently supported or fixed, installed firmly, and measures should be taken to prevent moisture and corrosion.
7. The connecting wire of the output circuit of the sensor should use twisted-pair copper core wire with a cross-sectional area of not less than 1.0 m2, and should leave a margin of not less than 150 mm, and its ends should be clearly marked.
8. When there is no separate installation condition, the sensor can also be installed in the distribution box, but it cannot affect the main circuit of the power supply. A certain distance should be kept as far as possible, and there should be clear signs.
9. The installation of the sensor should not destroy the integrity of the monitored line, and should not increase the line contacts.
Construction Technology of Fire Equipment Power Monitoring System
1. Process flow
Pre-construction preparations→Piping and wiring→Monitor installation→Sensor installation→System grounding→Commissioning→System training and delivery
2. Preparatory work before construction
1. The construction of the system must be undertaken by the construction unit with the corresponding qualification level.
2. The installation of the system must be carried out by professionals.
3. The construction of the system shall be carried out in accordance with the approved engineering design documents and construction technical plans, and shall not be changed arbitrarily. When it is really necessary to change the design, the original design unit shall be responsible for the change and shall be reviewed by the drawing review organization.
4. The construction of the system shall be prepared according to the design requirements and approved by the supervision unit. The construction site shall have necessary construction technical standards, a sound construction quality management system and a project quality inspection system. And should fill in the construction site quality management inspection records according to the requirements of Appendix B.
5. The following conditions should be met before system construction:
(1) The design unit shall clarify the corresponding technical requirements to the construction, construction and supervision units;
(2) The system diagram, equipment layout plan, wiring diagram, installation diagram and necessary technical documents shall be available;
(3) The system equipment, materials and accessories are complete and can ensure normal construction;
(4) The water, electricity and gas used on the construction site and in the construction shall meet the normal construction requirements.
6. The installation of the system shall be subject to the quality control of the construction process according to the following provisions:
(1) The quality control of each process should be carried out according to the construction technical standards. After each process is completed, it should be inspected, and the next process can only be entered after passing the inspection;
(2) When the handover between the relevant professional types of work is carried out, the inspection shall be carried out, and the next process can only be entered after obtaining the visa of the supervising engineer;
(3) During the construction process, the construction unit shall make relevant records such as acceptance of concealed works, inspection of insulation resistance and grounding resistance, system debugging and design changes;
(4) After the completion of the system construction process, the construction party shall check and accept the installation quality of the system;
(5) After the installation of the system is completed, the construction unit shall debug it according to the regulations;
(6) The quality inspection and acceptance of the construction process should be completed by the supervision engineer and the personnel of the construction unit;
(7) The construction quality inspection and acceptance shall be filled in according to the requirements of Appendix C.
7. The owner of the property right of the building shall establish and save the installation and test records of each sensor in the system.
3. On-site inspection of equipment and materials
1. Before the construction of the system, the equipment, materials and accessories shall be inspected on site. The site acceptance shall have a written record and the signature of the participants, and be signed and confirmed by the supervising engineer or the construction unit; use.
2. When equipment, materials and accessories enter the construction site, there should be documents such as checklist, instruction manual, quality certification documents, and inspection report of the national legal quality inspection agency. Compulsory certification (accreditation) products in the system should also have certification (accreditation) certificates and certification (accreditation) marks.
3. The main equipment of the system should be products that have passed the national certification (approval). The product name, model and specification should meet the design requirements and standard regulations.
4. The product name, model and specification of non-national compulsory certification (approval) in the system should be consistent with the inspection report.
5. There should be no obvious scratches, burrs and other mechanical damages on the surface of system equipment and accessories, and the fastening parts should not be loose.
6. The specifications and models of system equipment and accessories should meet the design requirements.
Fourth, wiring
1. The wiring of the system should meet the requirements of the current national standard “Code for Acceptance of Construction Quality of Building Electrical Installation Engineering” GB50303.
2. The threading in the pipe or the trunking should be carried out after the completion of building plastering and ground works. Before threading, the accumulated water and sundries in the pipe or trunking should be removed.
3. The system should be wired separately. Lines of different voltage levels and different current categories in the system should not be placed in the same pipe or in the same slot of the wire trough.
4. There should be no joints or kinks when the wires are in the pipe or in the trunking. The connector of the wire should be soldered in the junction box or connected with a terminal.
5. The nozzles and pipe joints of pipelines laid in dusty or humid places should be sealed.
6. When the pipeline exceeds the following lengths, a junction box should be installed at the place where the connection is convenient:
(1) When the length of the pipe exceeds 30m without bending;
(2) When the length of the pipe exceeds 20m, there is one bend;
(3) When the length of the pipe exceeds 10m, there are 2 bends;
(4) When the length of the pipe exceeds 8m, there are 3 bends.
7. When the pipe is put into the box, the outer side of the box should be covered with a lock nut, and the inner side should be equipped with a guard. When laying in the ceiling, the inner and outer sides of the box should be covered with a lock nut.
8. When laying various pipelines and wire grooves in the ceiling, it is advisable to use a separate fixture to hoist or fix it with a support. The diameter of the boom of the hoisting trunking shall not be less than 6mm.
9. Lifting points or fulcrums should be set at intervals of 1.0m to 1.5m on the straight section of the trunking, and lifting points or fulcrums should also be set at the following positions:
(1) At the joint of the trunking;
(2) 0.2m away from the junction box;
(3) The direction of the wire groove is changed or at the corner.
10. The wire slot interface should be straight and tight, and the slot cover should be complete, flat, and free of warped corners. When installed side by side, the slot cover should be easy to open.
11. When the pipeline passes through the deformation joints of the building (including settlement joints, expansion joints, seismic joints, etc.), compensation measures should be taken, and the conductors should be fixed on both sides of the deformation joints with appropriate margins.
12. After the system wires are laid, the insulation resistance of the wires of each loop should be measured with a 500V megohmmeter, and the insulation resistance to the ground should not be less than 20MΩ.
13. The wires in the same project should be distinguished by different colors according to different uses, and the colors of the wires for the same use should be the same. The positive pole of the power cord should be red and the negative pole should be blue or black.
Five, the installation of the monitor
1. When the monitor is installed on the wall, the height of the bottom edge from the ground (floor) surface should be 1.3m~1.5m, the side distance near the door axis should not be less than 0.5m from the wall, and the front operation distance should not be less than 1.2m ;
2. When installing on the ground, the bottom edge should be 0.1m-0.2m higher than the ground (floor) surface. and meet the following requirements:
(1) The operating distance in front of the equipment panel: it should not be less than 1.5m when it is arranged in a single row; it should not be less than 2m when it is arranged in a double row;
(2) On the side where the personnel on duty often work, the distance from the equipment panel to the wall should not be less than 3m;
(3) The maintenance distance behind the equipment panel should not be less than 1m;
(4) When the arrangement length of the equipment panel is greater than 4m, a channel with a width of not less than 1m should be set at both ends.
3. The monitor should be installed firmly and should not be tilted. Reinforcement measures should be taken when installing on lightweight walls.
4. The cables or wires introduced into the monitor shall meet the following requirements:
(1) The wiring should be neat, avoid crossing, and should be fixed firmly;
(2) The cable core wire and the end of the wire should be marked with the serial number, which should be consistent with the drawing, and the writing is clear and not easy to fade;
(3) For each terminal of the terminal board (or row), the number of wiring should not exceed 2;
(4) There should be a margin of less than 200mm for the cable core and wire;
(5) The wires should be tied into bundles;
(6) After the lead wire is passed through the tube, it should be blocked at the inlet tube.
5. It is strictly forbidden to use the power plug for the main power lead-in line of the monitor, and should be directly connected to the fire power supply; the main power supply should have an obvious permanent mark.
6. The grounding (PE) wire of the monitor should be firm and have obvious permanent signs.
7. Terminals with different voltage levels, different current categories and different functions in the monitor should be separated and marked with obvious signs.
6. Installation of the sensor
1. The installation of the sensor should fully consider the power supply mode and power supply voltage level.
2. The sensor and the bare live conductor should ensure a safe distance, and the sensor with the metal casing should be safely grounded.
3. It is forbidden to install the sensor without cutting off the power supply.
4. The sensors in the same area should be centrally installed in the sensor box, placed near the distribution box, and reserved for the connection terminals with the distribution box.
5. The sensor (or metal box) should be independently supported or fixed, installed firmly, and measures should be taken to prevent moisture and corrosion.
6. The connecting wire of the output circuit of the sensor should use a twisted pair copper core wire with a cross-sectional area of not less than 1.0mm². And should leave a margin of not less than 150mm, the end should be clearly marked.
7. When there is no separate installation condition, the sensor can also be installed in the distribution box, but it cannot affect the main circuit of the power supply. A certain distance should be kept as far as possible, and there should be clear signs.
8. The installation of the sensor should not destroy the integrity of the monitored line, and should not increase the line contacts.
9. AC current transformer size and wiring diagram
7. System grounding
1. The metal shell of the fire-fighting electrical equipment with AC power supply and DC power supply above 36V should have grounding protection, and its grounding wire should be connected to the electrical protection grounding trunk (PE).
2. After the construction of the grounding device is completed, the grounding resistance shall be measured and recorded as required.
Eight, fire equipment power monitoring system example diagram
Common faults of power monitoring system of fire fighting equipment
1. Host part
(1) Fault type: main power failure
cause of issue:
a. The main electric fuse is damaged;
b. The main power switch is turned off when the host is running.
Approach:
a. Check whether there is a short circuit in the line, and replace the fuse with the corresponding parameters.
b. Turn on the main power switch of the host.
(2) Fault type: backup power failure
cause of issue:
a. The backup power fuse is damaged;
b. The backup power switch is not turned on;
c. Bad connection of backup battery;
d. The battery is damaged or the backup power conversion circuit board is damaged.
Approach:
a. Replace the backup power fuse;
b. Turn on the backup power switch;
c. Re-stabilize the battery wiring and connect;
d. Use a multimeter to check whether there is voltage at the positive and negative terminals of the backup battery, and perform charging or battery replacement according to the voltage indication.
(3) Fault type: unable to boot
cause of issue:
a. The power supply is not connected or the power switch is not turned on
b. The fuse is damaged
c. The power conversion board is damaged
Approach:
a. Use a multimeter to check whether the power supply terminal is voltage input, if not, turn on the switch of the corresponding distribution box. After turning it on, check whether the voltage meets the working value of the host voltage, and then turn it on after confirming that it is correct.
b. Check whether there is a short circuit fault in the power supply line. After checking the line fault, replace the fuse with the corresponding parameters.
C. Withdraw the output terminal of the power board, check whether there is voltage input at the input terminal and whether the fuse is damaged. If not, replace the power conversion board.
Post time: Nov-26-2022