Danfoss VLT AutomationDrive FC 360 Quick Manual

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4.2.1 General RequirementsWARNINGEQUIPMENT HAZARD!Rotating shafts and electrical equipment can behazardous. Extreme care should be taken to protectagainst electrical hazards when applying power to theunit. All electrical work must conform to national andlocal electrical codes and installation, start up, andmaintenance should only be performed by trained andqualified personnel. Failure to follow these guidelinescould result in death or serious injury.CAUTIONWIRING ISOLATION!Run input power, motor wiring and control wiring in 3separate metallic conduits or use separated shieldedcable for high frequency noise isolation. Failure to isolatepower, motor and control wiring could result in less thanoptimum frequency converter and associated equipmentperformance.Run motor cables from multiple frequency convertersseparately. Induced voltage from output motor cablesrun together can charge equipment capacitors even withthe equipment turned off and locked out.• An electronically activated function within thefrequency converter provides overload protectionfor the motor. The overload provides Class 20motor protection. See chapter 7.1 Warning andAlarm Types for details on the trip function.Wire Type and Ratings• All wiring must comply with local and nationalregulations regarding cross-section and ambienttemperature requirements.• Danfoss recommends that all power connectionsbe made with a minimum 75 °C rated copperwire.• See chapter 8 Specifications for recommendedwire sizes.4.2.2 Grounding RequirementsWARNINGGROUNDING HAZARD!For operator safety, it is important to ground thefrequency converter properly by a certified electricalinstaller in accordance with national and local electricalcodes as well as instructions contained within thisdocument. Ground currents are higher than 3.5 mA.Failure to ground the frequency converter properly couldresult in death or serious injury.• Proper protective grounding for equipment withground currents higher than 3.5 mA must beestablished, see chapter 4.2.2.1 Leakage Current(>3.5 mA).• A dedicated ground wire is required for inputpower, motor power, and control wiring.• Use the clamps provided with the equipment forproper ground connections.• Do not ground one frequency converter toanother in a “daisy chain” fashion (seeIllustration 4.3).• Keep the ground wire connections as short aspossible.• Using high-strand wire to reduce electrical noiseis recommended.• Follow motor manufacturer wiring requirements.130BC500.10FC 1FC 1FC 2FC 2FC 3FC 3PEPEIllustration 4.3 Grounding Principle4.2.2.1 Leakage Current (>3.5 mA)Follow national and local codes regarding protectiveearthing of equipment with a leakage current > 3.5 mA.The earth leakage current depends on various systemconfigurations including RFI filtering, screened motorcables, and frequency converter power.EN/IEC61800-5-1 (Power Drive System Product Standard)requires special care if the leakage current exceeds 3.5 mA.Grounding must be reinforced in one of the followingways:Installation Quick Guide18 Danfoss A/S © Rev. 06/2014 All rights reserved. MG06A50244