ABB Relion 650 Series Installation Manual

Also see for RELION 650 SERIES: Technical manual Technical manual Commissioning manual Engineering manual Operation manual

Contents

ConductorPair ShieldPair separatorJacketSeparatorOverall shieldDrain wireen07000139.vsdIEC07000139 V1 EN-USFigure 29: Cross section of communication cableThe EIA standard RS-485 specifies the RS485 network. An informative excerpt is given insection "Installing the serial communication cable for RS485 SPA/IEC".6.3.2 Installing the serial communication cable for RS485 SPA/IECSEMOD176342-192 v3Informative excerpt from EIA Standard RS-485 - Electrical Characteristics of Generators andReceivers for Balanced Digital Multipoint SystemsRS-485 Wire - Media dependent Physical layer1 Normative referencesEIA Standard RS-485 - Electrical Characteristics of Generators and Receivers for BalancedDigital Multipoint Systems2 Transmission methodRS-485 differential bipolar signaling2.1 Differential signal levelsTwo differential signal levels are defined:A+ =line A positive with respect to line BA- =line A negative with respect to line B2.2 Galvanic isolationThe RS485 circuit shall be isolated from earth by:Riso ≥ 10 MWCiso ≤ 10 pFThree isolation options exist:a) The entire node electronics can be galvanically isolatedb) The bus interface circuit can be isolated form the rest of node electronics byoptoisolators, transformer coupling or otherwise.c) The RS485 chip can include built-in isolation2.3 Bus excitation and signal conveyance2.3.1 Requirementsa) The RS485 specification requires the Signal A and Signal B wires.b) Each node also requires (5 V) Excitation of the RS485 termination network.Table continues on next page1MRK 514 027-UEN D Section 6Connecting650 series 45Installation manual© Copyright 2017 ABB. All rights reserved