What should be paid attention to when installing elevator surveillance camera and the reasons for interference

First, the problems that should be paid attention to when installing elevator monitoring cameras.

1. First, ask the elevator manufacturer, elevator staff or property whether there is a video cable (for analog cameras) or a network cable (for network cameras) in the accompanying cable of the elevator. Under normal circumstances, the original elevator will be connected by cables. If it is determined that there is no video cable (which is unlikely), it needs to be laid again, and it must be carried out in accordance with standard technology, and wires with good shielding performance must be used, otherwise the elevator 380V motor will interfere with video signals when it is running. Who will lay it? The cost shall be negotiated with Party A. ..

2. Before installing the elevator camera, you need to inform the elevator staff to be present, stop the elevator and get on the elevator car with them.

3. According to the appearance of the camera (flying saucer or hemisphere), make holes in the elevator ceiling to fix the camera.

4. Use video cable or network cable to lead the camera signal to the top of the car and connect it to the attached cable. At the same time, power is supplied directly from the monitoring room (but many of them take 220V lighting power from the roof and use transformers to supply power to the camera). Pay attention to the use of good quality wires when leading wires, avoid other cables on the elevator and avoid crosstalk. According to the construction specifications.

5. Debug the angle focusing of the camera after starting.

Second, the reason of elevator camera interference

Mainly the interference caused by the operation of elevator motor. At present, the elevator basically adopts AC frequency conversion speed regulation technology, and the frequency conversion speed regulator itself has strong high-frequency parasitic interference. According to the measured results, the radiation bandwidth of frequency conversion governor is 0~ 10 MHz, and the interference signal amplitude is very strong. The 0~6 MHz video baseband signal is just in this frequency band, and the interference signal can invade the video signal from the power line and space, which will affect the image monitoring effect. This is the main reason of elevator interference and the most difficult interference problem to solve.

Three. Power interference and other interference factors In elevator monitoring, it is best for the camera power supply to be directly supplied by the main control room. If you can't supply power directly, you can choose to get power from the lighting power supply in the elevator car. But at present, most elevator manufacturers use fluorescent lamps in elevators, and these lamps all use electronic ballasts. When electronic ballast works, it will also produce strong AC parasitic interference output, and may also interfere with video signals.

Four. Avoidance and solution of elevator interference The main reasons of elevator video interference have been analyzed in detail above. As long as the cause of interference is found out, the interference problem can be solved. Solve the elevator interference, mainly from the following points.

1) Choosing a video cable with small attenuation coefficient, good shielding performance and high tensile strength can improve its anti-interference ability, reduce video attenuation and prevent interference signals from "invading" the shielding layer of the video cable.

2) Reasonable wiring: The reasonable wiring department effectively prevents interference signals from "coupling" through cables, minimizes the parallel binding distance with other cables, and keeps video cables away from interference sources, thus "avoiding" interference.

3) Use clean power supply to prevent power supply interference. It is best to use centralized power supply in the computer room to avoid power interference. The interference of power supply to video signal is also the most difficult interference problem to solve. If it is impossible to determine where the interference signal is introduced into the system, first determine whether it is power interference, and find a storage battery to directly supply power to the camera. If the interference is eliminated, it is proved to be power interference; if it cannot be eliminated, it is proved to be intrusion interference in the transmission cable.

Beijing Yidu Tiandi Technology Development Co., Ltd. is a company specializing in the production of Aoshan elevator floor displays, with a history of more than 65,438+00 years. Analog and network elevator floor displays have complete specifications, stable quality, powerful functions and convenient debugging. According to the elevator structure, the detectors of elevator floor display include photoelectric beam type, magnetic induction type and the earliest coil type, which are suitable for the installation of elevators of various specifications in the market.