Common failure phenomena and solutions of closed-circuit monitoring system
(One)
After a monitoring system enters the commissioning stage, trial operation stage and delivery, there may be such and other failure phenomena, such as: can not operate normally, the system can not meet the technical requirements of the design requirements, the overall performance and quality is not ideal, that is, Some "soft problems". These problems are inevitable for a monitoring engineering project, especially for a complex and large-scale monitoring engineering project.
1. Equipment failure caused by incorrect power supply.
Incorrect power supply generally has the following possibilities: the power supply line or the power supply voltage is incorrect, the power is not enough (or the line diameter of a certain power supply line is not enough, the voltage drop is too large, etc.), the transmission line of the power supply system has a short circuit, open circuit, instant Press and wait. In particular, damage to equipment due to power supply errors or instantaneous overvoltages occurs from time to time. Therefore, in system debugging, before power supply, it must be carefully and strictly checked and checked, and should never be taken lightly.
2. Because there are many links to some devices,
If the treatment is not good, especially if the circuit connected to the equipment is not handled well, there will be problems such as open circuit, short circuit, poor insulation between the wires, and incorrect wiring, which will cause damage to the equipment and performance degradation. In this case, it is necessary to calmly analyze according to the fault phenomenon and determine which lines have the faulty connection on several lines. This will reduce the scope of the problem. It is particularly worth noting that due to the omnidirectional movement of the camera with the gimbal, it takes a long time to cause the connection to fall off and break. Therefore, pay special attention to the connection between the equipment and various lines in this case should meet the requirements of long-term operation.
3. The quality of the equipment or component itself.
In theory, all kinds of equipment and components are likely to have quality problems. However, from an empirical point of view, it is purely a quality problem of the product itself, which mostly occurs in devices such as decoders, electric pan-tilts, transmission parts and so on. It is worth pointing out that some devices may not be unusable in terms of quality as a whole, but some technical indicators can not reach the indicators given in the product manual. Therefore, the necessary samples must be tested for the selected products. If it is indeed a product quality problem, the best way is to replace the product, rather than disassembly and repair.
In addition, the most common problem is due to improper adjustment of equipment. For example, the adjustment of the camera's back intercept is very meticulous and precise. If it is not adjusted carefully, problems such as poor focus or defocusing during various operations of the three variable lens will occur. In addition, whether the positions of some switches and adjustment knobs on the camera are correct, whether they meet the technical requirements of the system, whether the decoder coding switch or other adjustable parts are set correctly will directly affect the normal use of the device itself or the normal performance of the entire system .
Common faults and solutions of monitoring system
After a monitoring system enters the commissioning phase, trial operation phase, and delivery, it is possible that such failures may occur. These failures may not operate normally, or the system may not meet the technical specifications required by the design; or the overall The performance and quality are not ideal, and some so-called "soft problems" appear. These problems are inevitable for a monitoring project, especially for a complex and large-scale monitoring project. After problems occur, it is the duty and responsibility of engineering and technical personnel to try to solve them. 1. No image display, no video signal
Description of the fault phenomenon: After the line is normally connected and powered on, there is no image display on the display terminal of the central control room, and the "No signal" prompt of "No video signal", matrix, and graphics splitter of the hard disk recorder exists.
Reason analysis: The general situation of this phenomenon can be concluded that the front-end video signal is not normally transmitted back to the control device. It may be that the camera is not normally powered and does not work; the power cord is disconnected, the camera is not powered; the video cable is disconnected; BNC head welding is not reliable.
Solution: first confirm whether the camera is powered on and working normally; if the camera is not powered, check the power supply, transformer, power cord, etc .; if the camera is powered on, you can use the elimination method to directly connect the camera to the display terminal to observe, if it is not displayed Then confirm that the camera is faulty. If the image shows, you can determine that the video transmission line is faulty. Check the video cable and BNC connector. After confirming, replace the cable or re-weld the BNC connector.
In a monitoring system, problems often occur during commissioning and trial operation. The system that has been tested and accepted for delivery should generally not have problems within a short period of time. Even if there is a problem with the system being put into use, it often occurs in terms of equipment quality or construction quality (especially the construction quality of the transmission part). The following are some more common faults, provided for readers as a reference.
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