Frequency Inverter DF51... - Moeller.com.tr

04/07 AWB8230-1541GB EMC <strong>com</strong>plianceLine reactorThe line reactor (also called <strong>com</strong>mutating or line reactor) isconnected to the mains side input cables L1, L2 and L3, or L and N(depending on type). It reduces the harmonics and therefore – byup to 30 % – the apparent mains current.A mains reactor also limits any current peaks caused by potentialdips (for example caused by p.f. correction equipment or earthfaults) or switching operations on the mains.The mains reactor increases the lifespan of the DC link capacitorsand consequently the lifespan of the frequency inverter. Its use isalso re<strong>com</strong>mended:• with single-phase supplies (DF51-322),• with derating (temperatures above +40 °C, sites of installationmore than 1000 m above sea level),• for parallel operation of multiple frequency inverters on a singlemains supply point,• with DC link coupling of multiple frequency inverters(interconnected operation).Line reactors and their assignment to the DF51 frequency invertersare listed in the appendix, section “Line reactor”, page 222.Mains filterMains filters are a <strong>com</strong>bination of line reactors and radiointerference filters in a single enclosure. They reduce the currentharmonics and dampen high frequency radio interference levels.Radio interference filters only dampen high frequency radiointerference levels.h Attention!When line filters or radio interference filters are used, thedrive unit’s leakage current to earth increases. Observethis point when residual-current circuit-breakers are used.EMC <strong>com</strong>plianceThe DF51 frequency inverters operate with fast electronic switches(IGBTs). For this reason, radio interference can occur on thefrequency inverter’s output, which may effect other electronicdevices in the direct vicinity, such as radio receivers ormeasurement instruments. To protect against this radio frequencyinterference (RFI), the devices should be screened and installed asfar away from the frequency inverter as possible.UhnK1Figure 10: DF51 and radio interference filter in a sealed enclosureK1: RFI filterT1: frequency invertera Screened motor cablennT1M3haEMC Directives for PDS drive systems(PDS = Power Drive System)In Europe, the EMC Directive must be adhered to by law.The EMC product standard for drive systems is IEC/EN 61800-3and EN 61800-3 including A11 (02/2001). This standard must alsobe maintained by law. The generic standards do not apply to drivesystems, although many values are the same.EN 61800-3 does not apply to the frequency inverter itself, but toa <strong>com</strong>plete drive system including cable and motor. A drive systemcan consist of more than one drive. EN 61800-3 regards drivesystems that consist of several drives as a single drive system.Declarations of conformity relate to a “typical drive system” withgiven cable length, motor and filter for a single drive. The drivesystem’s manufacturer is responsible for the <strong>com</strong>plete drivesystem.21