電氣工程及其自動(dòng)化外文資料翻譯-電氣類-在線瀏覽
2024-07-23 20:20本頁(yè)面
【正文】 installation requirements could result in death or serious injury to personnel, and/or damage to equipment. Always follow these requirements when installing S7200 PLCs. Separate the S7200 Devices from Heat, High Voltage, and Electrical Noise As a general rule for laying out the devices of your system, always separate the devices that generate high voltage and high electrical noise from the lowvoltage, logictype devices such as the S7200. Installing the S7200 Chapter 3 When configuring the layout of the S7200 inside your panel, consider the heatgenerating devices and locate the electronictype devices in the cooler areas of your cabi. Operating any electronic device in a hightemperature environment will reduce the time to failure. Consider also the routing of the wiring for the devices in the panel. Avoid placing low voltage signal wires and munications cables in the same tray with AC power wiring and highenergy, rapidlyswitched DC wiring. Provide Adequate Clearance for Cooling and Wiring S7200 devices are designed for natural convection cooling. For proper cooling, you must provide a clearance of at least 25 mm above and below the devices. Also, allow at least 75 mm of depth. Caution For vertical mounting, the maximum allowable ambient temperature is reduced by 10 degrees C. Mount the S7200 CPU below any expansion modules. When planning your layout for the S7200 system, allow enough clearance for the wiring and munications cable connections. For additional flexibility in configuring the layout of the S7200 system, use the I/O expansion cable. Figure 31 Mounting Methods, Orientation, and Clearance Installing the S7200 Chapter 3 Power Budget All S7200 CPUs have an internal power supply that provides power for the CPU, the expansion modules, and other 24 VDC user power requirements. The S7200 CPU provides the 5 VDC logic power needed for any expansion in your system. Pay careful attention to your system configuration to ensure that your CPU can supply the 5V power required by your selected expansion modules. If your configuration requires more power than the CPU can supply, you must remove a module or select a CPU with more power capability. Refer to Appendix A for information about the 5 VDC logic budget supplied by your S7200 CPU and the 5 VDC power requirements of the expansion modules. Use Appendix B as a guide for determining how much power (or current) the CPU can provide for your configuration. All S7200 CPUs also provide a 24 VDC sensor supply th
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