Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

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Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual Manual pdf 25 page image

FusesBranch circuit protection:In order to protect the installation against electrical and fire hazard, all branch circuits in an installation,switch gear, machines etc., must be short-circuited and overcurrent protected according to national/international regulations.Short-circuit protection :The frequency converter must be protected against short-circuit to avoid electrical or fire hazard. Danfossrecommends using the fuses mentioned below to protect service personnel and equipment in case of aninternal failure in the drive. The frequency converter provides full short-circuit protection in case of ashort-circuit on the motor output.Overcurrent protection:Provide overload protection to avoid fire hazard due to overheating of the cables in the installation. Thefrequency converter is equipped with an internal overcurrent protection that can be used for upstreamoverload protection (UL-applications excluded). See par. 4-18. Moreover, fuses or circuit breakers canbe used to provide the overcurrent protection in the installation. Overcurrent protection must always becarried out according to national regulations.Fuses must be designed for protection in a circuit capable of supplying a maximum of 100,000 Arms(symmetrical), 500 V maximum.Non UL complianceIf UL/cUL is not to be complied with, we recom-mend using the following fuses, which will ensurecompliance with EN50178:In case of malfunction, not following the recom-mendation may result in unnecessary damage ofthe frequency converter.FC 300 Max. fuse size1) Voltage TypeK25-K75 10A 200-240 V type gG1K1-2K2 20A 200-240 V type gG3K0-3K7 32A 200-240 V type gG5K5-7K5 63A 380-500 V type gG11K 80A 380-500 V type gG15K-18K5125A 380-500 V type gG22K 160A 380-500 V type aR30K 200A 380-500 V type aR37K 250A 380-500 V type aRFC 300 Max. fuse size1) Voltage TypeK37-1K5 10A 380-500 V type gG2K2-4K0 20A 380-500 V type gG5K5-7K5 32A 380-500 V type gG11K-18K 63A 380-500 V type gG22K 80A 380-500 V type gG30K 100A 380-500 V type gG37K 125A 380-500 V type gG45K 160A 380-500 V type aR55K-75K 250A 380-500 V type aR1) Max. fuses - see national/international regula-tions for selecting an applicable fuse size.How to InstallMG.33.A8.02 - VLT is a registered Danfoss trademark 25