Danfoss VLT 5000 Series Design Manual
Also see for VLT 5000 Series: ManualInstruction manualInstructionsOperating instructionsQuick setup
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RFI switchMains supply isolated from earth:If the frequency converter is supplied from an isolatedmains source (IT mains) or TT/TN-S mains with groun-ded leg, the RFI switch is recommended to be turnedoff (OFF) 1) . For further reference, see IEC 364-3. Incase optimum EMC performance is needed, parallelmotors are connected or the motor cable length isabove 25 m, it is recommended to set the switch in ONposition.In OFF position, the internal RFI capacities (filter ca-pacitors) between the chassis and the intermediatecircuit are cut off to avoid damage to the intermediatecircuit and to reduce the earth capacity currents (ac-cording to IEC 61800-3).Please also refer to the application note VLT on ITmains, MN.90.CX.02. It is important to use isolationmonitors that are capable for use together with powerelectronics (IEC 61557-8).1) Not possible with 5042-5602, 525-690 V units.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 they arepushed 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.Position of RFI switchesBookstyle IP 20VLT 5001 - 5006 200 - 240 VVLT 5001 - 5011 380 - 500 VCompact IP 20/NEMA 1VLT 5001 - 5006 200 - 240 VVLT 5001 - 5011 380 - 500 VVLT 5001 - 5011 525 - 600 VCompact IP 20/NEMA 1VLT 5008 200 - 240 VVLT 5016 - 5022 380 - 500 VVLT 5016 - 5022 525 - 600 VVLT ® 5000 Design GuideMG.52.B2.02 - VLT ® is a registered Danfoss trademark 81Electrical installation |
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