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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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BUS датащи(PDF) 27 Page - Christian Bürkert GmbH & Co. KG |
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BUS датащи(HTML) 27 Page - Christian Bürkert GmbH & Co. KG |
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27 / 42 page  Type büS büS network shielding 27 11.3 Network with direct shielded devices Shield is grounded at multiple points to FE. Direct shield connection on both cable ends or at multiple devices to FE has shielding effects against E and H fields. But take care for equipotential FE grounding area to prevent compensation currents over shield! Gateway Device 1 (Direct) Equipotential, clean FE area Device 3 (Direct) Device 4 (Direct) Device 2 (Direct) Fig. 27: Direct shielded device If equipotential FE area is not feasible, e.g. between two buildings, there are some measures to improve; e.g. add bypass conductor or a grounded cable duct nearby büS cable. Gateway Device 1 (Direct) Building A: Equipotential, clean FE Device 3 (Direct) Device 4 (Direct) Device 2 (Direct) Building B: Equipotential, clean FE Metal duct or strong bypass conductor FE connected on both ends Fig. 28: Direct shielded device, 2 buildings Explanation of graphic elements: ▪ Each device-internal shielding (None, Direct, RC) is said in brackets. ▪ Green line represents büS cable shield. |
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