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Industry Installation Guidelines For Pulse Width Modulated .

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Application TechniquesOriginal InstructionsIndustry Installation Guidelines for Pulse Width Modulated (PWM)AC DrivesIndustries discussed in this application technique include:AutomotiveChemical/Specialty ChemicalFood and BeverageForest Products/ConvertingMarine and OffshoreMining and SteelTire ManufacturingWater/Waste Water

Summary of ChangesThis manual contains new and updated information as indicated in the following table.TopicAdded Warning statement that hull must not be used as a conductor to Ungrounded Power section in Chapter 4.Added land shield verification step to the Encoder Feedback Signal Wiring – Rockwell Automation Recommended Shielding Technique checklist in Appendix AAdded dynamic brake cable verification step to the Dynamic Brakes design checklist in Appendix AAdded Dynamic Brake cable verification step to the Dynamic Brakes Pre-installation checklist in Appendix AAdded land shield verification step to the Encoder Feedback Signal Wiring – Rockwell Automation Recommended Shielding Technique Pre-Installation Checklist in Appendix AAdded dynamic brake cable verification step to the Dynamic Brakes post-installation checklist in Appendix AAdded land shield verification step to the Encoder Feedback Signal Wiring – Rockwell Automation Recommended Shielding Technique post-installation checklist in Appendix A2Rockwell Automation Publication DRIVES-AT003D-EN-P - April 2021Page39424244454646

Table of ContentsPrefaceAbout This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Who Should Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Recommended Agencies and Standards Publications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5National Electrical Manufacturers Association (NEMA) . . . . . . . . . . . . . . . . . . . . . . . 5Underwriters Laboratories, Inc. (UL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Canadian Standards Association (CSA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6National Fire Protection Association (NFPA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6International Society of Automotive Engineers (SAE). . . . . . . . . . . . . . . . . . . . . . . . . 6The Institute of Electrical and Electronics Engineers, Inc. (IEEE). . . . . . . . . . . . . . . 6American Bureau of Shipping (ABS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7The International Society of Automation (ISA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7International Electrotechnical Commission (IEC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Chapter 1Environmental ConsiderationsGeneral Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Enclosure Types and Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9North American Standards Organizations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9International Standards Organizations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Degree of Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10IEC Enclosure Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Abridged Descriptions of IEC Enclosure Test Requirements. . . . . . . . . . . . . . . . . . . . . . 11Tests for Protection Against Access to Hazardous Parts (first characteristicnumeral). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Tests for Protection Against Water (second characteristic numeral) . . . . . . . . . . 13Abridged Descriptions of NEMA Enclosure Test Requirements. . . . . . . . . . . . . . . . . . . . 146.2 Rod Entry Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.3 Drip Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.4 Rain Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.5.1.1 (2) Outdoor Dust Test (Alternate Method) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.5.1.2 (2) Indoor Dust Test (Alternate Method) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156.6 External Icing Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156.7 Hosedown Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156.8 Rust Resistance Test (Applicable Only to Enclosures Incorporating ExternalFerrous Parts) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156.9 Corrosion Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156.11 (2) Air Pressure Test (Alternate Method) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156.12 Oil Exclusion Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Abridged Descriptions of UL Standard 698 Test Requirements . . . . . . . . . . . . . . . . . . . 16Explosion Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Hydrostatic Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Temperature Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Dust Penetration Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Temperature Test with Dust Blanket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Enclosure Type Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Rockwell Automation Publication DRIVES-AT003D-EN-P - April 20211

Table of ContentsType 1 – General Purpose Surface Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Type 1 – Flush Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Type 3 – Rainproof Dusttight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Type 3R – Rainproof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Type 4 – Watertight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Type 4X – Non-metallic, Corrosion-resistant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Type 6P – For Prolonged Submersion at a Limited Depth . . . . . . . . . . . . . . . . . . . . 18Type 7 – For Hazardous Gas Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Type 9 – For Hazardous Dust Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Type 12 – Dusttight Industrial Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Type 13 – Oiltight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Enclosure Type Descriptions for Non-hazardous Locations . . . . . . . . . . . . . . . . . . . . . . 19Enclosures Offered by Rockwell Automation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Chapter 2Industry Related InstallationConsiderationsGeneral Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Contaminants and Conditions by Industry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Environmental and Atmospheric Considerations by Location. . . . . . . . . . . . . . . . . 23Explanation of Contaminant Severity Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Explanation of Contaminant Severity Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Relative Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Duty Rating of the AC Drive Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Periodic Duty Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Short-time Duty Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Non-periodic Duty Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Continuous Duty Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Protecting Electronic Modules From Contaminants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Shielding by Enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Source Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Ventilation Control and Removal Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Outdoor Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Protecting Electronic Modules During Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Sources of Reactive Contaminants and Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Chapter 3System Configurations,Grounding, Application, andControl2Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31System Configurations and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Delta/Wye with Grounded Wye Neutral. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Delta/Delta with Grounded Leg or Four-wire Connected Secondary Delta . . . . . . 32Three-phase Open Delta with Single-phase Center Tapped . . . . . . . . . . . . . . . . . . 32Ungrounded Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32High Resistance Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Application and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Automotive Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Chemical and Specialty Chemical Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Food and Beverage Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Forest Products and Converting Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Mining and Steel Industry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Rockwell Automation Publication DRIVES-AT003D-EN-P - April 2021

Table of ContentsTire Manufacturing Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Water and Waste Water Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Chapter 4Marine and Offshore IndustryTypical Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Typical Hazardous Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Shielding by Enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Protecting Electronic Modules During Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39System Configurations and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Ungrounded Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Ungrounded Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Application and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40System Design and Implementation Considerations . . . . . . . . . . . . . . . . . . . . . . . . 40Appendix ASample Drive InstallationRequirementsDesign Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Input Power Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Grounding and Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Motor Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Encoder Feedback Signal Wiring – Rockwell Automation RecommendedShielding Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Dynamic Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Wire Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Surge Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Pre-Installation Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43AC Supply Source Input Power Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Surge Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Grounding and Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Mounting Considerations and Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Control and Signal Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Dynamic Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Motor Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Encoder Feedback Signal Wiring – Rockwell Automation RecommendedShielding Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Post Installation Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45AC Supply Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Input Power Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Surge Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Grounding and Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Mounting Considerations and Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Control and Signal Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Dynamic Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Motor Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Encoder Feedback Signal Wiring – Rockwell Automation RecommendedShielding Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Rockwell Automation Publication DRIVES-AT003D-EN-P - April 20213

Table of ContentsAppendix BSample Requirements andEnclosure Specifications forSpecific Industry TypesAutomotive Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Enclosure Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Welded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Frame and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Forest Products/Converting (Pulp Paper Products) Industry . . . . . . . . . . . . . . . . . . . . . 48Enclosure Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Welded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Frame and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Marine and Offshore Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Metals Industry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Enclosure Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Welded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Frame and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Mining Process Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Enclosure Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Welded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Frame and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Oil, Gas, and Chemical Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Enclosure Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Welded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Frame and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Open Pit Mining Products. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Enclosure Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Welded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Frame and Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53IndexAdditional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594Rockwell Automation Publication DRIVES-AT003D-EN-P - April 2021

PrefaceAbout This PublicationThe purpose of this application technique is to provide basic information for different enclosure systems and environmental/locationconsiderations (to help protect against environmental contaminants), and power and grounding considerations needed to properly install aPulse Width Modulated (PWM) AC drive. The industry-specific guidelines in this document are meant to be used as examples - specificlocations are unique and the guideline examples should be adapted accordingly.Pulse width modulation is a form of control used to generate a waveform necessary to operate an induction motor. With PWM control it ispossible to change the speed of the motor by varying the frequency sent to the motor. PWM drives are also known as Variable FrequencyDrives, and Adjustable Speed Drives.Who Should Use This ManualThis manual is intended for qualified personnel who plan and design installations of PWM AC drives.Recommended Agencies and Standards PublicationsThe following agencies and standards publications provide general information for installing drives and drive enclosures in regards toenvironmental conditions and degrees of protection against ingress of contaminants.National Electrical Manufacturers Association (NEMA)1300 North 17th StreetSuite 1847Rosslyn, VA 22209, USAwww.nema.org NEMA Standards Publication No. 250, Enclosures for Electrical Equipment (1000 Volts Maximum)NEMA Standards Publication No. ICS6, Enclosures for Industrial Controls and SystemsUnderwriters Laboratories, Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062, USAwww.ul.com UL 50 Enclosures for Electrical Equipment, Non-Environmental Considerations (Type 1)UL 50E Enclosures for Electrical Equipment, Environmental Considerations (Remaining Types)UL 94 Flammability of Plastic MaterialsUL 414 Meter SocketsUL 497 Protectors for Paired Conductor Communication CircuitsUL 508A Industrial Control PanelsUL 870 Wireways, Auxiliary Gutters and Associated FittingsUL 1203 Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) LocationsRockwell Automation Publication DRIVES-AT003D-EN-P - April 20215

Preface UL 1773 Termination BoxesUL 1863 Communication Circuit AccessoriesUL 2279 Electrical Equipment for Use in CLI Zone 1 and 2 Hazardous LocationsCanadian Standards Association (CSA)178 Rexdale BoulevardRexdale (Toronto), Ontario, CanadaM9W 1R3www.csa.caCSA Standard C22.2: No. 0 General Requirements - Canadian Electrical Code, Part IINo. 0.4 Bonding and Grounding of Electrical Equipment (Protective Equipment)No. 14 Industrial Control Equipment for Use in Ordinary (Non- Hazardous) LocationsNo. 25 Enclosures for Use in Class 11 Groups E, F, and G Hazardous LocationsNo. 26 Construction and Test of Wireways, and Auxiliary Gutters, and Associated FittingsNo. 40 Cutout, Junction, and Pull BoxesNo. 76 SplittersNo. 94 Special Purpose EnclosuresNo. 182.4 Plugs, Receptacles, and Connections for Communications SystemsNational Fire Protection Association (NFPA)Batterymarch ParkQuincy, MA 02169-7471, USAwww.nfpa.org NFPA 70 National Electrical CodeNFPA 70e Standard for Electrical Safety Requirements for Employee WorkplacesNFPA 79 Electrical Standard for Industrial MachineryNFPA 496 Purged and Pressurized Enclosures for Electrical EquipmentInternational Society of Automotive Engineers (SAE)400 Commonwealth DriveWarrendale, PA 15096-0001, USAwww.sae.org SAE HS 1738 SAE Standard - Electrical Equipment for Automotive Industrial MachineryThe Institute of Electrical and Electronics Engineers, Inc. (IEEE)3 Park Avenue,New York, NY 10016-5997, USAwww.ieee.org 6IEEE 45, Recommended Practice for Electrical Installations on ShipboardRockwell Automation Publication DRIVES-AT003D-EN-P - April 2021

PrefaceAmerican Bureau of Shipping (ABS)ABS Plaza16855 Northchase DriveHouston, TX 77060, USAwww.eagle.org Rules for Building and Classing Steel Vessels 2009, Part 4, Vessel Systems and MachineryThe International Society of Automation (ISA)67 Alexander DriveResearch Triangle Park, NC 27709, USAwww.isa.org ISA-71.04-2013, Environmental Conditions for Process Measurement and Control Systems: Airborne ContaminantsInternational Electrotechnical Commission (IEC)3, rue de VarembéP.O. Box 131CH - 1211 Geneva 20 - Switzerlandwww.iec.ch IEC Publication 529, contains descriptions and associated test requirements that define the degree of protection each IP numeralspecifiesIEC Publication 60079, standard for installations in hazardous areasIEC Publication 60079-20, section for flammability group and temperature class of equipment installed in hazardous areasIEC Publication 60529, describes the complete test procedures for standard degrees of protection ratingsConventions Used in This ManualThese conventions are used throughout this manual. Bulleted lists such as this one provide information, not procedural steps.Numbered lists provide sequential steps or hierarchical information.Rockwell Automation Publication DRIVES-AT003D-EN-P - April 20217

PrefaceNotes:8Rockwell Automation Publication DRIVES-AT003D-EN-P - April 2021

Chapter1Environmental ConsiderationsThis chapter describes environmental considerations, standards, and agency requirements for enclosures for different environments. Thisis not meant to be a comprehensive guide but provide information that can let you know the different regulations that need to be furtherstudied and complied with for your location. Please contact your local Rockwell Automation representative for assistance in selecting oraddressing environmental concerns.General InformationYou must evaluate the environment where your AC drive will be installed, identify any contaminants, and provide the correct degree ofprotection for the AC drive and electronics in either a stand-alone installation or when mounting the drive inside an enclosure. Thisevaluation and degree of protection helps to make sure the drive functions correctly and reliably. If the drive is going to be placed into anenvironmental setting that is harsher than defined by the specified rating of the drive, it must be installed in the proper type of protectiveenclosure. If the drive is not installed in the proper type of protective enclosure it can suffer failure from atmospheric contaminants whichproduce corrosion.Corrosion failures of industrial electronic equipment is a concern, especially in industry groups such as water/waste water, paper making,steel, and tire manufacturing. For these industries, sulfur compounds that can attack electrical components and lead to failure are typical.These failures can be unexpected because the relatively low levels of sulfur concentration that can lead to electronic failure are often notperceived as severe by workers in those facilities. Electronic assemblies can fail due to several corrosion mechanisms. This corrosion canoccur with or without electrical voltage being present, and can also compromise insulated systems, if and when they become conductive.Conformal coating of printed circuit boards can prevent some of the contamination challenges faced in the field; but, because allcomponents are not coated, there is still a need to review the applications and environments. Refer to Conformal Coating for Variable SpeedDrives, publication DRIVES-WP021.Enclosure Types and RatingsWhat's in an Enclosure Rating?As a way of standardizing enclosure performance, organizations like National Electrical Manufacturers Association (NEMA), UnderwritersLaboratories, Inc. (UL), Canadian Standards Association (CSA), International Electrotechnical Commission (IEC), and Association for Electrical,Electronic and Information Technologies (Verband der Elektrotechnik, Elektronik und Informationstechnik [VDE]) use rating systems toidentify the ability of an enclosure to resist external environmental influences. Resistan

National Electrical Manufacturers Association (NEMA) 1300 North 17th Street Suite 1847 Rosslyn, VA 22209, USA www.nema.org NEMA Standards Publication No. 250, Enclosures for Electrical Equipment (1000 Volts Maximum) NEMA Standards Publication No. ICS6, Enclosures for Industrial