Danfoss AKD 5001 Manual

Contents

Danfoss AKD 5001 Manual Manual pdf 32 page image

AKD 5000Installation Electrical installation - EMC precautionsThe following is a guideline to good engineeringpractice, when installing drives. Following theseguidelines is advised, where compliance with EN50081, EN 55011 or EN 61800-3 First environment isrequired. If the installation is in EN 61800-3 Secondenvironment, then it is acceptable to deviate from theseguidelines. It is however not recommended. See alsoCE labelling, Emission and EMC test results underspecial conditions in the Design Guide for further details.Good engineering practice to ensure EMC-correctelectrical installation:• Use only braided screened/armoured motor cablesand braided screened/armoured control cables. Thescreen should provide a minimum coverage of 80%.The screen material must be metal, not limited tobut typically copper, aluminium, steel or lead. Thereare no special requirements for the mains cable.• Installations using rigid metal conduits are notrequired to use screened cable, but the motorcable must be installed in conduit separate fromthe control and mains cables. Full connectionof the conduit from the drive to the motor isrequired. The EMC performance of flexibleconduits varies a lot and information from themanufacturer must be obtained.• Connect the screen/armour/conduit to earthat both ends for motor cables as well as forcontrol cables. See also Earthing of braidedscreened/armoured control cables.• Avoid terminating the screen/armour withtwisted ends (pigtails). Such a terminationincreases the high frequency impedance of thescreen, which reduces its effectiveness at highfrequencies. Use low impedance cable clampsor EMC cable glands instead.• It is important to ensure good electrical contactbetween the mounting plate on which the frequencyconverter is installed and the metal chassis ofthe frequency converter. This however doesnot apply to IP54 units as they are designed forwall mounting and AKD 5032-5052, 200-240VAC in IP20/Nema1 enclosure.• Use starwashers and galvanically conductiveinstallation plates to secure good electricalconnections for IP00 and IP20 installations.• Avoid using unscreened/unarmoured motor orcontrol cables inside cabinets housing the drive(s),whenever this can be avoided.• An uninterrupted high frequency connectionbetween the frequency converter and the motorunits is required for IP54 units.The illustration shows an example of an EMC-correctelectrical installation of an IP 20 frequency converter;the frequency converter has been fitted in an installationcabinet with an output contactor and connectedto a PLC, which in this example is installed in aseparate cabinet. In AKD 5032-5052, 200-240VAC in Nema 1/IP20 enclosure screened cablesare connected by using EMC conduits to ensureproper EMC performance. See illustration. Otherways of making the installation may have as goodan EMC performance, provided the above guidelines to engineering practice are followed.Please note, that when the installation is not carriedthrough according to the guideline as well as whenunscreened cables and control wires are used, someemission requirements are not complied with, althoughthe immunity requirements are fulfilled. See the sectionEMC test results in the Design Guide for further details.MG.50.R3.02 - 31