Danfoss VLT AutomationDrive FC 300 Design Manual

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Danfoss VLT AutomationDrive FC 300 Design Manual Manual pdf 18 page image

with oil-resistant gaskets to mount oil-tight or dust-tightmechanisms. Doors are also provided with oil-resistantgaskets. In addition, enclosures for combination controllershave hinged doors, which swing horizontally and require atool to open.UL type validates that the enclosures meet NEMAstandards. The construction and testing requirements forenclosures are provided in NEMA Standards Publication250-2003 and UL 50, Eleventh Edition.IP CodesTable 2.4 provides a cross-reference between the 2standards. Table 2.3 demonstrates how to read the IPnumber code and defines the levels of protection. Thefrequency converters meet the requirements of both.NEMA type IP typeChassis IP00Protected chassis IP20NEMA 1 IP21NEMA 12 IP54Table 2.3 IP Number Cross ReferenceFirst digit (solid foreign objects)0 No protection1 Protected to 50 mm (hands)2 Protected to 12.5 mm (fingers)3 Protected to 2.5 mm (tools)4 Protected to 1.0 mm (wire)5 Protected against dust – limited entry6 Protected totally against dustSecond digit (water)0 No protection1 Protected from vertical dripping water2 Protected from dripping water at 15° angle3 Protected from water at 60° angle4 Protected from splashing water5 Protected from water jets6 Protected from strong water jets7 Protected from temporary immersion8 Protected from permanent immersionTable 2.4 IP Number Code Definitions2.5 Aggressive EnvironmentsA frequency converter contains a large number ofmechanical and electronic components, many of which arevulnerable to environmental effects.CAUTIONThe frequency converter should not be installed inenvironments with airborne liquids, particles, or gasescapable of affecting and damaging the electroniccomponents. Failure to take the necessary protectivemeasures increases the risk of stoppages, thus reducingthe life of the frequency converter.Degree of protection as per IEC 60529To prevent cross faults and short circuits betweenterminals, connectors, tracks, and safety-related circuitrycaused by foreign objects, the Safe Torque Off (STO)function must be installed and operated in an IP54 orhigher rated control cabinet (or equivalent environment).Liquids can be carried through the air and condense in thefrequency converter and may cause corrosion ofcomponents and metal parts. Steam, oil, and salt watermay cause corrosion of components and metal parts. Insuch environments, use equipment with enclosure rating IP54/55. As an extra protection, coated printed circuit boardscan be ordered as an option.Airborne particles such as dust may cause mechanical,electrical, or thermal failure in the frequency converter. Atypical indicator of excessive levels of airborne particles isdust particles around the frequency converter fan. In verydusty environments, use equipment with enclosure ratingIP54/IP55 or a cabinet for IP00/IP20/TYPE 1 equipment.In environments with high temperatures and humidity,corrosive gases such as sulphur, nitrogen, and chlorinecompounds will cause chemical reactions on the frequencyconverter components.Such chemical reactions will rapidly affect and damage theelectronic components. In such environments, mount theequipment in a cabinet with fresh air ventilation, keepingaggressive gases away from the frequency converter.Optional coated PCBs also offer protection in suchenvironments.NOTICEMounting frequency converters in aggressiveenvironments increases the risk of stoppages and consid-erably reduces the life of the converter.Before installing the frequency converter, check theambient air for liquids, particles, and gases. This is done byobserving existing installations in this environment. Typicalindicators of harmful airborne liquids are water or oil onmetal parts, or corrosion of metal parts.Excessive dust particle levels are often found on instal-lation cabinets and existing electrical installations. OneSafety and Conformity VLT® AutomationDrive FC 300 Design Guide 90-1200 kW16 MG34S202 - Rev. 2013-08-1922