Access control intercom purchase and system lightning installation precautions

The access control system should have a high degree of stability, choose an open hardware platform, support a variety of communication methods, lay a solid foundation for interconnection and system integration between devices, and also have standardized and modular components to ensure great Flexibility and scalability.

Access control intercom system lightning protection building intercom doors are outdoor, and the possibility of being struck by lightning is relatively high, causing great inconvenience to the user and causing great economic losses. Through the investigation and analysis of the causes of these lightning strikes, the main components of the crash are the power box, circuit board, and talker.

First, the main channel for lightning strikes (1) Direct strike. Direct lightning strikes the lightning directly on the object. The thundercloud close to the ground induces an opposite charge on the protrusion. When the electric field strength between the thundercloud and the ground protrusion reaches the air breakdown strength, it will strike. Wear discharge, this type of thundercloud directly puncture discharge on the ground protrusion is called direct lightning. High buildings and their sides are subject to direct lightning strikes, and direct lightning strikes on the side of a building may be called side impact mines.

(2) Induction of thunder. Lightning strikes a conductor, such as a metal object next to the device, and indirectly strikes the object. Lightning induction is divided into electrostatic induction and electromagnetic induction. The formation of electrostatic induction is due to the induction of a large number of opposite charges on the top of ground projections when the cloud approaches the ground. When the thundercloud and other thunderclouds or other objects are discharged, the accumulated charge on the top of the protrusion suddenly loses its bondage, and it exhibits a high voltage, which propagates in the form of lightning waves. The formation of electromagnetic induction is due to direct lightning currents that produce a rapidly changing strong magnetic field in the surrounding space, which induces high voltages in nearby metals. Induction mines are not as violent as thunder but they are much more likely to occur than direct thunder. Because direct lightning strikes only when lightning strikes the ground, it will cause disasters to the ground. Induction lightning, however, strikes lightning regardless of the lightning strikes on the ground, or lightning strikes between thunderclouds may occur and cause disasters. A lightning stroke can occur in a relatively large range and multiple small parts at the same time, and this induced high voltage can be transmitted far through the signal wires, power lines, telephone lines and other metal wires, resulting in lightning The scope has expanded.

Second, the installation of access control intercom system lightning protection The main approach for lightning attacks above should take the following measures to prevent:

1. The installation position of the power box should be properly selected.

(1) Avoid installing on the side wall of the house, especially on the side wall of the projected house, so as to prevent direct lightning strikes.

(2) Avoid installation on the side of a pipe where there is a metal pipe or a gas pipe. In particular, it must not be installed on the same side wall that is less than 5 meters away from the metal pipe and air pipe.

2. Both the power box and the circuit board should be grounded. The grounding wire should be solid and reliable, and the grounding resistance should be ≤ 0.1Ω.

3, wiring should be correct and reasonable. Power lines and signal lines should be placed indoors to avoid outdoor wiring as much as possible, and to avoid the same direction and cross wiring with metal pipes, gas pipes, etc., and to avoid the same wiring with metal pipes, gas pipes, etc. The distance between the two should be ≥ 5 meters. . The wiring should be laid in a straight line to minimize bending wiring.

4. The power source of the power box should be connected to the power socket. When weather is prevented or weather changes may cause lightning, it is convenient to cut off the power in a timely manner to prevent lightning strikes.

Access control intercom purchase eight points First, the strong stability "stability" is the first choice of access control system selection, should take into account as far as possible in the world's leading mature products, after a number of authoritative certification, and has many typical users , years of normal operation, and highly recognized in the industry.

In terms of hardware, devices from the controller to the terminal are mature and stable products. As the core of the system, the access controller needs to support the offline mode of operation. It must use flash and other non-volatile memory chips. The power-off or impact information will not be lost. Failure of the server and terminal to identify equipment does not affect the normal operation of the system. As the management software supported by the system, it should have a stable and reasonable database structure design. Between the hardware and the real-time polling method, the communication connection and address of the hardware should be maintained and monitored. Complete data integrity, reliability, and consistency.

Second, a strong anti-destruction ability Access control system used to protect people and property safety, so the system must be safe. The high security mentioned here refers to the natural or quasi-natural properties of the product or system. It should ensure the safety of the equipment and system and the operator's safety. For example, the equipment and the system must be able to withstand high temperatures and low temperatures. Hot and humid, and can prevent static electricity, anti-jamming, etc.; on the other hand, access control and security systems should also have anti-human damage features, such as: with tamper alarm.

Third, excellent compatibility In order to facilitate the future upgrade, expansion and anti-jamming considerations, it is recommended to choose the terminal identification equipment that meets international standards, rather than the compatibility as wide as possible. Some formats have some advantages in terms of locality, but they do not comply with international standards. They will cause problems for future upgrades, capacity expansion, and anti-jamming. They should adhere to the principle of “practicality, stability, and compliance with standards”.

Fourth, flexible scalability and economicity The proposed registration card authority needs to reach 30,000, which can be suitable for most of the customer's storage capacity requirements, facilitate attendance statistics and business scale expansion. The main equipments should adopt modular design and adopt advanced wiring methods. Through software and hardware upgrades, future system expansions can be realized without having to make major changes to the system to maximize the economical principle. At the same time, products should be cost-effective.

Fifth, powerful software management functions With the increasingly wide range of access control systems, requirements and attendance management, security alarm, parking control, elevator control, consumer management, CCTV linkage, online patrol and other systems to achieve linkage control function Therefore, the system software should have a video interface and support extended functions.

6. The easy-to-maintain system should be simple and easy to install and configure, simple and popular, and have a unified network management capability, which is easy to maintain.

VII. Purchase of mature brands of mature brand products at the designated agents of the manufacturers can guarantee a perfect and powerful service system. This includes two aspects: first, technical support for the implementation of the project and good after-sales services; second, reliable follow-up research and development capabilities to ensure New and old products have consistency and compatibility.

Buying from agents can have reliable quality and perfect services. Buying from other channels may have lower prices, but technical support and after-sales service may not be enough.

VIII. Appearance of the product With the improvement of people's aesthetic standards, while pursuing functional and practical, one can use its design as one of the reference standards in order to realize the additional functions of visual enjoyment.