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1. The wireless monitoring equipment indicates the DC12V/AC24V universal. What kind of power source should be selected?
A: Select AC24V monitoring power supply, because the same transmission distance, the higher the voltage, the smaller the loss. When the voltage is high, the load can get a sufficient voltage. At the same time, since the AC 24V is used, when the camera is commissioned, the power supply can be synchronized so that the image frequency of the different devices in the entire monitoring system can be synchronized.
2. How to properly configure the camera power supply of the entire monitoring system?
A: This problem often embarrasses young and inexperienced engineers. When implementing many programs, it is found that the originally designed power supply capacity is insufficient, additional equipment is needed, and Party A will appear to be buckling. In fact, because the camera starts at a momentary instant and the starting current is very large, coupled with the loss of long-distance transmission over the project, the power required by the surveillance camera is not simply the sum of the rated power of all cameras. The correct approach is to add the rated power of the camera of the entire surveillance system by 1.3 times. This is the actual power required by the camera, and then adds about 30% of the loss. Finally, plus 30% of the margin, as Expand capacity in the future.
3, surveillance camera power configuration, the most taboo what?
A: The most taboo is: The entire monitoring system shares a power supply. The reason is as follows:
1) When the system is being repaired, it is often necessary to turn the power on and off. All cameras start at the same time when the power is turned on. The start-up current is particularly large, and the impact on the power supply is great. The power will be severely burned.
2) All surveillance cameras share a single power supply. When the power supply fails, the entire CCTV system is paralysed. In particular, the images of some important entrances and exits cannot be monitored and may cause unnecessary trouble.
What should be the correct approach? To give an example: a business building has 100 fixed cameras, a total of about 800W power supply, the correct configuration should be to select 4 sets, each 200W power supply. In this way, when a certain power supply fails, the cameras at the important entrances and exits can be connected to other good power supplies so as not to affect the work of the entire system.
4, monitoring camera power supply selection also need to pay attention to what the problem?
A: First, when connecting the camera to the power supply, do not connect the camera with a long distance away and the surveillance camera with a short distance to the same power supply. If connected to the same power supply, if the power supply voltage is high, the camera at a short distance will be burned, the power supply voltage will be low, and the camera at a relatively long distance will have no image. You should try to connect the surveillance cameras that are far away from one another to the same power supply and connect the closer cameras to the same power supply.
Second: If the monitoring distance is too far, you need to configure a higher voltage power supply, such as 30V, 36V, etc., or even directly for 220V AC power, to the front and then change the pressure.
December 02, 2019