Graphic analysis video monitoring cable

The use of twisted pair transmission in elevator monitoring is the most important route, and it is best to exit from the middle of the hoistway. The cable needs to be laid in the hoistway and bundled with the accompanying cable. First, the accompanying cable is bundled with a wide cable tie, and then the small cable tie is fixed from the cable tie. 20-30CM bundled once, each reserved 3CM room (according to a finger can be accommodated), but the twisted-pair cable needs to be reserved and fixed at the top of the car. Pictured:

If the line cannot be reached in the middle, bundle it on the accompanying cable to the elevator room (you can avoid 3CM from the middle of the hoistway). Be careful not to make the cable slot strong when leaving the elevator room and keep a certain distance from the elevator motor. Isolation then leads to the monitoring center.

Another method is to directly use the video cable provided in the accompanying cable to exit the elevator shaft (the cable can also be routed along the shaft wall to the bottom of the hoistway when in the middle of the hoistway) and then use an active transmitter to transmit the twisted pair cable. To the monitoring center.

Note that since the elevator car, variable frequency motor, wire rope winch and other devices are all grounded properly, the transmitter or video cable should not be shared with its grounding system. The power supply for the camera and active transmitter can be directly connected to the dedicated power connector at the top of the car.

Of course, these methods need to be selected according to your site construction environment. The best is the first way. The following is a simple system diagram, I believe that if you do these processing, the image should be very satisfied.

The lightning protection and grounding protection is the content of the building's electrical design and installation. The lightning protection and grounding system of the building is to divert lightning energy to ensure the safety of buildings and equipment. With the further development of building technology, the lightning protection system has been further improved, and elevators, which have special structural-level properties, have linked the lightning protection of buildings to elevators, such as the International Electrotechnical Commission standard IEC 1204--1:1990. Article 1.2.18 explicitly mentions that the elevator guide rails can constitute a metal device for lightning current paths. After the safety ground protection of elevator equipment adopts equipotential bonding measures, the ability of building lightning protection and lightning strike resistance will be improved to varying degrees. The sightseeing elevator outside the bare building must have corresponding lightning protection measures.

In practical projects, it is often difficult to implement independent grounding devices for all above groundings. Common grounding devices are usually used. General requirements The grounding resistance of the common grounding device is not more than 1Ω. The grounding wire can be connected to the PE wire in the power distribution room of a building with a cross-sectional area of ​​not less than 16 mm2. The first end of the copper wire (PE wire) can be laid in parallel with the elevator power cable. The end of the ground wire and the elevator The auxiliary equipotential plates in the machine room are connected.