Elevator monitoring interference solution, elevator installation monitoring problem

My own practical experience: one is the line problem, and the other is the motor operation interference problem.

My general resolution steps:

1. Directly measure the DC power supply of the hemisphere to see if the 12V is stable. Troubleshoot the power supply and power adapter faults.

Second, change a hemisphere to see the effect, and eliminate the failure of the hemisphere itself.

3. Observe whether the interference persists or is present while the elevator is running. Most of the persistent faults are first-line faults (poor joint contact, video head welding faults), and a small part are due to the interference of other electrical appliances around (which can be solved by anti-jammers). If it only exists when the elevator is running, it may be the motor interference of the elevator, because the moment the elevator runs and stops is a strong current change; It may also be a cable failure, because when the elevator is running, the accompanying cable of the elevator is pulled, and the fault is obviously exposed when pulling.

If it is motor interference, re-fix the cable at the bottom of the car, try to avoid the motor of the elevator, which can reduce the interference problem and install an anti-jammer. If that doesn't work, the cable can only be replaced.

If this phenomenon occurs, it is usually the ** cable used is not special for the elevator, and the ** cable for the real elevator should be inside the flat cable, so that many problems will be considered when making the cable, including interference and disconnection.

Ordinary coaxial cables are not possible even if they are tied to the accompanying cable of the car.

Try installing an anti-jammer.

In addition, if there is no reserved ** line in the elevator accompanying cable, there are two situations, one: if the accompanying cable is fixed in half of the elevator shaft, then you only need to lay a ** line along the elevator accompanying cable, about 18 meters, from the place where the accompanying cable is fixed to punch through the wall hole, about between the fifth and sixth floors, and then pull from here to the third floor, adding up to about 27 meters. Two:

If the accompanying cable is fixed in the elevator machine room, then you need to lay a ** line along the accompanying cable, about 33 meters, and pull from the elevator machine room to the monitoring room, about 24 meters, then it is 57 meters.

The power supply can be connected directly from the elevator car, generally connected to the elevator lighting circuit, and other circuits will interfere, so it is recommended not to connect. However, this has a disadvantage that sometimes the lighting circuit will be turned off when the elevator is maintained or repaired, resulting in no ** output. The impact is not significant, though, and most of them do.

**If you interfere, it is recommended to add an amplifier to the computer room, and be cautious about the choice of elevator power supply, it is best to pull a separate wire from the machine room, and there is a reserved line in the accompanying cable. Two can be used.

There are two reasons for this:

1. Is the floor display host sharing 12V with the camera, if so, please add an independent power supply.

2. If you exclude 1, it is "ground loop" interference, and the simplest solution is single-point grounding, that is: the front end is not grounded, and the host of the monitoring room is grounded as standard. Because the two systems are not newly installed at the same time, and single-point grounding is not realistic, it is more troublesome to solve.

In this way, only the local first try, first, to ensure that the installation of the building display host (including the shell) and the ground insulation. Second, ensure that the connected camera is insulated from the ground. Third, ensure the standard grounding of the indoor host of the monitoring. Use the tester to see if the output of the floor display ** is normal.

If it doesn't work, you can only contact the building display manufacturer to see if there is a good way.

Also, if it doesn't work, please install an anti-jammer between the camera in the car and the floor display (explain the prevention of ground loop interference when purchasing).

I don't know if you're using the same power supply.,Try changing the power supply of the building display.,It's best to use the transformer power supply If it's environmental interference, add ycjk240 to solve it。

The main reason for the interference of the camera image signal in the elevator is generally caused by the power electricity in the elevator.

The monitoring in the elevator is best transmitted using the special cable of the elevator, and each line must be connected correctly. The cable is kept away from the wires that power the electricity.

Possible occurrence: 1. You may not use a special ** cable; 2. Devices such as inverters for elevator control will generate a lot of clutter; 3. The transmission distance from the elevator to the monitoring room is long. 4. The elevator itself has poor grounding or the grounding wire is too small.

Measures can be taken: 1. The power supply of the camera is best changed to a switching power supply, and it is best to take power on the top of the elevator, and the shorter the distance to the camera, the better. 2. When the camera is installed, the shell should be isolated from the metal part of the elevator with rubber parts, and the spare signal line (not less than the square) of the elevator should be grounded separately for the camera, and the grounding wire of the elevator machine room should be confirmed.

3. Use a special ** cable instead, and it is best to keep a distance of not less than 50mm from the elevator accompanying cable when pay-off. 4. If the elevator itself is very high or the distance to the monitoring room is very far, it is best to install a first-class signal amplifier in the elevator machine room.

Then use a pinhole-type camera, and you can buy it by typing my name.