7.7.3 Safety Earth ConnectionThefrequency converter has a high leakage current andmust be earthed appropriately for safety reasons accordingto EN 50178.WARNINGThe earth leakage current from the frequency converterexceeds 3.5 mA. To ensure a good mechanical connectionfrom the earth cable to the earth connection (terminal 95),the cable cross-section must be at least 10 mm2 or 2 ratedearth wires terminated separately.7.7.4 Spark Free InstallationUnits with ingress protection rating IP55 (NEMA 12) orhigher prevent spark formation and are classified as limitedexplosion risk electrical apparatus in accordance with theEuropean Agreement concerning International Carriage ofDangerous Goods by Inland Waterways (ADN )For units with ingress protection rating IP20, IP21 or IP54,prevent risk of spark formation as follows:• Do not install a mains switch• Ensure that 14-50 RFI Filter is set to [1] On.• Remove all relay plugs marked “RELAY”. SeeIllustration 7.61.• Check if relay options are installed. No other relayoptions than MCB 113 are allowed (remove relayplugs as above).130BC301.111234567891011Illustration 7.61 Location of Relay PlugsManufacturers declaration is available upon request7.8 EMC-correct Installation7.8.1 Electrical Installation - EMCPrecautionsThe following is a guideline to good engineering practicewhen installing frequency converters. Follow theseguidelines to comply with EN 61800-3 First environment. Ifthe installation is in EN 61800-3 Second environment, i.e.industrial networks, or in an installation with its owntransformer, deviation from these guidelines is allowed butnot recommended. See also paragraphs CE Labelling,General Aspects of EMC Emission and EMC Test Results.Good engineering practice to ensure EMC-correctelectrical installation:• Use only braided screened/armoured motorcables and braided screened/armoured controlcables. The screen should provide a minimumcoverage of 80%. The screen material must bemetal, not limited to but typically copper,Electrical Installation VLT® AutomationDrive FC 300 Design Guide, 0.25-75 kW144 MG33BE02 - VLT® is a registered Danfoss trademark77RSPSupply - 1-888-532-2706 - www.RSPSupply.comhttp://www.RSPSupply.com/p-21462-Danfoss-131B8966-VLT-Automation-VT-Drive-VFD-FC301-230V-5-HP.aspx
