EN / ACS850-04 (1.1 to 45 kW) Hardware Manual - VAE ProSys sro

44Alternative power cable typesPower cable types that can be used with the drive are represented below.Motor cable(also recommended for supply cabling)Symmetrical shielded cable: three phase conductors anda concentric or otherwise symmetrically constructed PEconductor, and a shieldNote: A separate PE conductor is required if theconductivity of the cable shield is not sufficient for thepurpose. See section General rules above.PE conductorand shieldShieldShieldPEPEAllowed for supply cablingShieldA four-conductor system: three phase conductors anda protective conductor.PEPEMotor cable shieldTo function as a protective conductor, the shield must have the same cross-sectionalarea as a phase conductor when they are made of the same metal.To effectively suppress radiated and conducted radio-frequency emissions, theshield conductivity must be at least 1/10 of the phase conductor conductivity. Therequirements are easily met with a copper or aluminium shield. The minimumrequirement of the motor cable shield of the drive is shown below. It consists of aconcentric layer of copper wires with an open helix of copper tape. The better andtighter the shield, the lower the emission level and the bearing currents.Insulation jacketCopper wire screenHelix of copper tapeInner insulationCable coreProtecting the relay output contacts and attenuating disturbances in caseof inductive loadsInductive loads (relays, contactors, motors) cause voltage transients when switchedoff.The relay outputs on the drive are protected with varistors (250 V) againstovervoltage peaks. In addition, it is highly recommended to equip inductive loadsPlanning the electrical installation