Security monitoring Four common faults in engineering
Four common engineering faults:
1. Security monitoring power supply is incorrect
There are several possibilities for incorrect power supply: incorrect power supply line or voltage, insufficient power (or insufficient wire diameter of one power supply line, excessive voltage drop, etc.), short circuit, open circuit, instantaneous overvoltage, etc. in the transmission line of the power supply system. Especially, equipment damage caused by power supply error or instantaneous overvoltage often occurs. Therefore, during system commissioning and before power supply, check and check carefully and strictly.
2. Poor wiring of security monitoring
Due to certain equipment (such as video camera And PTZ). If they are not properly handled, especially the lines connected to the equipment, there will be problems such as open circuit, short circuit, poor insulation between lines, wrong wiring, etc., which will lead to equipment damage and performance degradation. In this case, it is necessary to conduct a calm analysis according to the fault phenomenon, and determine which lines on several lines are connected incorrectly to cause the fault phenomenon. This will narrow down the scope of problems. It is worth pointing out that it is common for the camera with PTZ to fall off and break the connection due to its omnidirectional movement for a long time. Therefore, special attention should be paid to the connection between equipment and various lines in this case, which should meet the requirements of long-term operation.
3. Quality problems of security monitoring equipment or components
Theoretically, all kinds of equipment and components may have quality problems. However, from experience, it is purely the quality problem of the product itself, which mostly occurs in, electric pan tilt, transmission parts and other equipment. It is worth pointing out that some equipment may not be unusable in terms of quality as a whole, but some technical indicators cannot meet the indicators given in the product manual. Therefore, necessary sampling inspection must be carried out for the selected products. If it is really a product quality problem, the best way is to replace the product rather than disassemble and repair it by yourself.
In addition, the most common problem is caused by improper adjustment of equipment. For example, the adjustment of the camera's rear intercept is very meticulous and accurate. If not carefully adjusted, there will be poor focus or defocus during various operations of the three variable lens. 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, and whether the coding switches or other adjustable parts are set correctly will directly affect the normal use of the equipment itself or the normal performance of the entire system.
4. Security monitoring connection is incorrect
The problems caused by incorrect connection between equipment (or parts) and equipment (or parts) generally occur in the following aspects:
1) Impedance mismatch.
2) Communication interface or communication mode does not correspond. This mostly happens between the control host and or the control keyboard and other devices with communication control relationship, that is, the selected control host and or the control keyboard are not the products of the same manufacturer. Therefore, the products of the same manufacturer shall be used for the host, control keyboard, etc.
3) The driving capacity is insufficient or exceeds the specified number of equipment connections. For example, some picture dividers with alarm input interfaces have given in their product manuals that they are connected to the system host connected to the alarm probe, long delay video recorder, etc. If the alarm probe is connected to the alarm input end of the picture dividers again, the alarm signal of the probe will drive both the alarm host and the picture dividers. Security monitoring In this case, the project often has the problem of insufficient driving ability. The phenomenon is that although the image splitter can give an alarm, the input alarm signal is weak and the operation is unstable, which causes the image picture of the camera corresponding to the alarm signal to be instantly converted to a full screen picture on the monitor but lost (can not be kept), and the image on the monitor is still a multi picture before the alarm.
