Five error-prone parts when the ball press is installed:
1. Power supply: In order to ensure the normal operation of the dome, the power supply should not be lower than the nominal value of the input voltage of the dome. When the nominal value is 24VAC, the voltage fluctuation should not exceed ± 25%. The common working voltage of the dome is 24VAC. At present, there are 220VAC model ball machines on the market. In essence, a transformer is built in the ball cover, and the ball machine is powered after voltage change. The wiring should emphasize the separation of strong and weak currents to avoid the interference of strong currents on weak currents. The dome camera has limited internal space, and the built-in transformer makes the strong and weak currents coexist, which affects the weak current signals. In addition, the built-in transformer will increase the burden of heat dissipation, thereby increasing the possibility that the built-in circuit will burn out. Depending on the site environment, you can choose local 220VAC to 24VAC, or remote voltage transformation, centralized power supply. When centralized power is supplied, full consideration should be given to the loss of electrical energy by the transmission line. Choose equipment with higher output power and increase the output voltage appropriately to bear the line voltage drop. For example, choose 28VAC output to power the remote dome camera. If the dome camera has obtained enough electric power to drive, you can pass the multimeter test. The method is to use a multimeter to measure the voltage of the power line at one end of the dome camera while the load (ball machine) is on, and observe whether the voltage is within the scope of the dome camera. It is important to note that the power consumed by the outdoor dome is very different when the heater is started or stopped. When powering the outdoor dome, the maximum power required for the dome in the harshest environment must be considered. When the mains voltage fluctuation exceeds the range of + 5% -10%, an AC voltage stabilizing device shall be provided. UPS can be installed to provide uninterrupted and stable power supply.
2. Grounding: The grounding of the dome is mainly divided into the shell grounding and the internal electrical grounding. The grounding of the shell is mainly used to prevent the accumulation of static electricity and electrical leakage. Outdoor ball machines must also be equipped with external lightning protection measures. Generally speaking, the outdoor dome casing installed on the pole support has naturally formed ground protection due to being screwed to the metal support, so no special treatment is required. The data cable and video cable inside the dome camera have been properly grounded. Connect the GND terminal inside the dome camera to the ground wire to ensure the equipment is effectively grounded.
3. Ground loop circuit: Even if the equipment is effectively grounded, there are differences in the zero potential between the dome camera and the center equipment, and there is an imbalance in the power load, which will still cause a ground potential difference. This potential difference generates a current through a closed loop formed by the coaxial cable, causing interference, thereby affecting the normal transmission of the video signal, and usually manifests as horizontal clutter in the middle of the image. The most effective way to solve the problem of the ground loop is to add a ground loop isolator in the video transmission. At present, most indoor / outdoor dome video signals are still transmitted by coaxial cables, and some domes are far away from the center equipment, which makes it easier to form ground loops. If the optical transceiver is used for signal transmission, the influence of the ground loop can be avoided more effectively.
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