Summary：Common Surveillance System Faults: Equipment and Component Malfunctions：
Surveillance systems may encounter various faults during the commissioning, trial operation, and post-delivery phases. These issues can manifest as operational failures, a failure to meet the technical specifications required by the design, or unsatisfactory overall performance and quality.
Common Surveillance System Faults: Equipment and Component Issues
Surveillance systems may encounter various faults during the commissioning, trial operation, or post-delivery phases. These issues might manifest as a failure to operate correctly, a failure to meet design specifications, or suboptimal overall performance and quality—often referred to as "soft" or elusive glitches. Such problems are virtually inevitable in surveillance projects, particularly large-scale, complex ones. It is the duty and responsibility of engineering personnel to identify and resolve these issues.
I. Faults Caused by or Manifesting in Equipment and Components (and Their Solutions): Although equipment and components should undergo commissioning and power-on testing prior to installation, problems arising during the installation process remain common.
A. Equipment faults caused by power supply issues. Power supply problems generally fall into several categories: incorrect power lines or voltage; insufficient power capacity (e.g., inadequate wire gauge leading to excessive voltage drop); and faults in the power transmission lines, such as short circuits, open circuits, or transient overvoltage. Equipment damage caused by incorrect power supply or transient overvoltage occurs frequently. B. Damage to or performance degradation of equipment (or components) caused by improper handling of wiring—particularly connections to the device itself—such as open circuits, short circuits, poor inter-wire insulation, or incorrect wiring. Even if the device itself is not physically damaged, the resulting symptoms appear to originate from the device or component. Complex wiring—such as that found in cameras with motorized zoom, focus, and iris (three-variable lenses) and pan-tilt units—is prone to these issues if not handled correctly. Poor connector quality and substandard wiring workmanship are common causes of such problems. In these situations, one should calmly analyze the symptoms to determine which specific wire connections are causing the fault; this helps narrow down the scope of the problem. For example, if a camera with a motorized lens produces a normal video signal but the lens cannot be controlled, there is no need to check the video output line; one need only inspect the lens control lines. Additionally, regarding connectors—particularly BNC types—there are stringent requirements for soldering and installation techniques. Improper handling can lead to malfunctions after a period of operation, even if no issues arise during the initial debugging and trial run phases. It is particularly worth noting that cameras equipped with pan-tilt units (PTZs) undergo omnidirectional movement; over time, this frequently causes connecting cables to detach or snap. Therefore, special attention must be paid to ensuring that connections for such equipment are robust enough to withstand long-term, continuous operation.
C. Quality issues with the equipment or components themselves. Generally, carefully selected, commercially available equipment or components should not exhibit quality defects. Even if problems do occur, they typically arise only after the system has been handed over and operated for a considerable period. Beyond inherent product quality issues, the most common problems stem from improper equipment adjustment. For instance, adjusting a camera's back-focal distance is a task requiring meticulous precision; failure to adjust it correctly can result in poor focus or defocusing during the operation of varifocal lenses. Furthermore, the correct positioning of switches and adjustment knobs—ensuring they meet system technical specifications—as well as the proper configuration of decoder address switches and other adjustable settings, directly impacts the equipment's functionality and the system's overall performance.
D. Problems arising from incorrect connections between pieces of equipment (or components). Issues in this category generally fall into the following areas:
a. Impedance mismatch: For example, connecting a video signal to a high-impedance monitor can result in an overly bright image, jittering characters, or intermittent character display.
b. Incorrect communication interfaces or protocols: This often occurs between devices that rely on communication-based control, such as the control host and decoders or control keyboards. Such issues usually arise when the control host and the decoders or keyboards are sourced from different manufacturers. Since different manufacturers often employ distinct communication methods or control code formats, it is advisable to select products from the same manufacturer for the control host, decoders, and control keyboards.
c. Insufficient drive capability or exceeding the specified number of connected devices: For example, there are limits on the number of master and slave control keyboards that can be connected to a control host; exceeding these limits will cause the system to malfunction. If the power output of the decoder/pan-tilt unit's power supply is lower than the actual requirements of the pan-tilt unit, it will be unable to drive the unit.
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