7.3 Power Connections 51
7.4 Control Wiring and Terminals 52
7.4.1 Correct Grounding of Control Cables 52
7.4.2 Control Cable Routing 54
7.4.3 Control Terminals 54
7.5 Fuses and Circuit Breakers 56
7.6 Motor 57
7.6.1 Motor Rotation 57
7.6.2 Motor Thermal Protection 58
7.6.3 Parallel Connection of Motors 58
7.6.4 Motor Insulation 60
7.6.5 Motor Bearing Currents 60
7.7 Residual Current Devices (RCD) and Insulation Resistance Monitor (IRM) 60
7.8 Leakage Current 61
7.9 IT Mains 63
7.10 Efficiency 64
7.11 Acoustic Noise 65
7.12 dU/dt Conditions 65
7.13 Electromagnetic Compatibility (EMC) 66
7.13.1 Overview 66
7.13.2 EMC Test Results 67
7.13.3 Emission Requirements 68
7.13.4 Immunity Requirements 68
7.13.5 EMC Compatibility 69
7.13.6 EMC-compliant Installation 70
7.14 Harmonics 73
7.14.1 Harmonics Overview 73
7.14.2 Harmonic Analysis 73
7.14.3 Effect of Harmonics in a Power Distribution System 74
7.14.4 IEC Harmonic Standards 75
7.14.5 Harmonic Compliance 76
8 Basic Operating Principles of a Drive
8.1 Introduction 77
8.2 Description of Operation 77
iv | Danfoss A/S © 2024.01 AJ435824192086en-000101 / 130R1295
Design Guide | VLT® AutomationDrive FC 360