Danfoss VLT 6000 HVAC Series Quick Setup Manual

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Danfoss VLT 6000 HVAC Series Quick Setup Manual Manual pdf 7 page image

VLT ® 6000 HVACInstallationlocal safety regulations are complied with. Inthe case of an earth fault, a DC content maydevelop in the faulty current.Never use ELCB relays, type A, since such relaysare not suitable for DC fault currents.If ELCB relays are used, this must be:• Suitable for protecting equipment with a directcurrent content (DC) in the faulty current(3-phase bridge rectifier)• Suitable for power-up with short chargingcurrent to earth• Suitable for a high leakage current■ RFI switchMains supply isolated from earth:If the frequency converter is supplied from an isolatedmains source ( IT mains) or TT/TN-S mains withgrounded leg, the RFI switch is recommendedto be turned off (OFF). For further reference, seeIEC 364-3. In case optimum EMC performance isneeded, parallel motors are connected or the motorcable length is above 25 m, it is recommendedto set the switch in ON position.In OFF position, the internal RFI capacities (filtercapacitors) between the chassis and the intermediatecircuit are cut off to avoid damage to the intermediatecircuit and to reduce the earth capacity currents(according to IEC 61800-3).Please also refer to the application note VLT onIT mains, MN.90.CX.02. It is important to useisolation monitors that are capable for use togetherwith power electronics (IEC 61557-8).NB!:The RFI switch is not to be operated withmains connected to the unit. Check thatthe mains supply has been disconnectedbefore operating the RFI switch.NB!:Open RFI switch is only allowed at factoryset switching frequencies.NB!:The RFI switch connects the capacitorsgalvanically to earth.The red switches are operated by means of e.g. ascrewdriver. They are set in the OFF position whenthey are pulled out and in ON position when theyare pushed in. Factory setting is ON.Mains supply connected to earth:The RFI switch must be in ON position in order for thefrequency converter to comply with the EMC standard.Bookstyle IP 20VLT 6002 - 6011 380 - 460 VVLT 6002 - 6005 200 - 240 VCompact IP 20 and NEMA 1VLT 6002 - 6011 380 - 460 VVLT 6002 - 6005 200 - 240 VVLT 6002 - 6011 525 - 600 VMG.60.C7.02 - VLT is a registered Danfoss trademark 7