Danfoss FC 300 Design Manual

Also see for FC 300: Operating instructions Instruction manual Design guide Design guide Design guide

Contents

Danfoss FC 300 Design Manual Manual pdf 116 page image

6.3.4. FusesBranch circuit protection:In order to protect the installation against electrical and fire hazards, all branch circuits in aninstallation, switch gear, machines, etc. must be short-circuited and overcurrent protected ac-cording to national/international regulations.Short-circuit protection:The adjustable frequency drive must be protected against short circuit in order to avoid electricalor fire hazard. Danfoss recommends using the fuses mentioned below to protect service personneland equipment in case of an internal failure in the drive. The adjustable frequency drive providesfull short-circuit protection in case of a short-circuit on the motor output.Overcurrent protection:Provide overload protection to avoid fire hazard due to overheating of the cables in the installation.The adjustable frequency drive is equipped with an internal overcurrent protection that can beused for upstream overload protection (UL applications excluded). See par. 4-18. Moreover, fusesor circuit breakers can be used to provide the overcurrent protection in the installation. Overcur-rent protection must always be carried out according to national regulations.Fuses must be designed for protection in a circuit capable of supplying a maximum of 100,000Arms (symmetrical), 500 V maximum.Non-UL complianceIf UL/cUL is not to be complied with, we recommend using the following fuses, which will ensurecompliance with EN50178:In case of malfunction, not following the recommendation may result in unnecessary damage tothe adjustable frequency drive.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-18K5 125A 380-500 V type gG22K 160A 380-500 V type aR30K 200A 380-500 V type aR37K 250A 380-500 V type aR1) Max. fuses - refer to national/international regulations to select an appropriate fuse size.FC 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 aR6. How to Install FC 300 Design Guide116 MG.33.B9.22 - VLT® is a registered Danfoss trademark.6