Construction scheme and precautions of twisted pair video transmitter elevator

Author：hlyb Add Time：2016-04-28 11:07:12

1、 The use scheme of twisted pair video transmitter in elevator hoistway is complex to the internal environment of the hoistway. The twisted pair transmission mode can be carried out according to the following three recommended schemes: a) routing in the middle of the hoistway 1. Select unshielded high-quality super category 5 cable. 2. A hole shall be opened on the wall in the middle of the shaft for outgoing line. 3. The cable shall be bundled with the accompanying cable, and the cable below the middle of the hoistway shall be reserved

1、 Application scheme of twisted pair video transmitter in elevator shaft

For the complex environment in the hoistway, the twisted pair transmission mode can be used according to the following three recommended schemes:

A) Middle route of hoistway

1. Select unshielded high-quality Cat 5 cables.

2. A hole shall be opened on the wall in the middle of the shaft for outgoing line.

3. The cable shall be bundled with the accompanying cable, and the cable below the middle of the hoistway shall be reserved

4. The transmitter shall be selected according to the distance requirements, and the transmitter shall be powered by * * * single.

B) Outgoing line of elevator machine room

1. Select unshielded high-quality Cat 5 cables.

2. The cables shall be bundled with the accompanying cables. The cables below the middle of the hoistway shall be reserved, and the cables above the hoistway shall be fastened.

3. The cables in the elevator machine room should not go through the strong current bridge, and should be connected to the monitoring center separately from the bridge as soon as possible.

4. The transmitter shall be selected according to the distance requirements, and the transmitter shall be powered by * * * single.

C) Installation of elevator machine room

1. The video cable provided with the accompanying cable is used as the front medium to install the transmitter in the elevator machine room.

2. The transmitter selects passive or active transmitters according to the length of the video line.

3. The receiver is installed in the monitoring center, and the passive or active receiver is selected according to the distance of twisted pair.

In addition, the conveyor and elevator grounding system shall be carried out separately. We recommend grounding the remaining lines in the network cable in the monitoring center, and grounding the receiver is to ensure that the equipment is protected from overvoltage. The above grounding devices are vertical grounding devices, which are often difficult to achieve. Common grounding devices are usually used. Generally, the grounding resistance of common grounding device shall not be greater than 1 Ω. The grounding wire can be a copper core wire (PE wire) with a cross-sectional area of not less than 16 mm2. The head end can be connected with the PE wire in the building distribution room, and can be laid in the same way with the elevator power cable. The end of the grounding wire is connected with the auxiliary equipotential board in the elevator machine room.

2、 Pay attention to the following points when Binding network cables:

1. Select qualified and soft unshielded network cable.

2. First fix it on the traveling cable with a thick tie.

3. Bind the net wire with fine binding tape and fix it in the thick binding tape.

4. The spacing of thick ties is 30cm, and 3cm is reserved for each section of network cable.

3、 Precautions for wiring construction of twisted pair video transmitter:

(1) . twisted pair must meet the national twisted pair product standard:

1. The twisted pair used shall be pure copper core The wire diameter is 0.5mm

2. The resistance of single core 100m is 9.38 ohms, and the resistance of 305 meters of a box line is about 28 ohms, not more than 30 ohms

3. The twist density shall meet the standard of class V wire

4. The flexibility and flame retardancy shall meet the national inspection standards.

(2) If it is used outdoors, please use outdoor waterproof twisted pair.

(3) During engineering wiring, it is forbidden to mix with high-voltage cables or equipment, and it cannot be placed together with frequency conversion equipment and communication signal generator.

(4) . each of the four pairs of wires in the cable transmits one signal, so video can be transmitted at the same time. Audio and control signals, and prevent the transmission of high current power supply in the cable. If a pair of low-voltage power supply in the network cable is required, DC12V shall be controlled within 150m, AC24V shall be controlled within 300m, and the control signal shall be controlled within 1000.

(5) Active and some passive products have built-in surge protection and need to be grounded. Outdoor applications can be grounded together with the camera. Note that the resistance of the grounding electrode must be qualified (reference value: 4 ohms)

(6) The video line from camera to transmitter shall be as short as possible to ensure stable signal quality.

Browse：

On A：Difference between power cable and control cable

Next：Elevator video interference solution

Industry news

Construction scheme and precautions of twisted pair video transmitter elevator