Danfoss VLT AutomationDrive FC 300 Instruction Manual

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Danfoss VLT AutomationDrive FC 300 Instruction Manual Manual pdf 24 page image

NOTE!In motors without phase insulation paper or other in-sulation reinforcement suitable for operation with volt-age supply (such as an adjustable frequency drive), fita sine-wave filter on the output of the adjustable fre-quency drive.3.3.4 FusesBranch circuit protection:In order to protect the installation against electrical and fire hazards, 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 adjustable frequency drive must be protected against short-circuit to avoid electrical or fire hazard. Danfoss recommends using the fuses mentionedbelow to protect service personnel and equipment in case of an internal failure in the drive. The adjustable frequency drive provides full short-circuitprotection 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 aninternal overcurrent protection that can be used for upstream overload protection (UL applications excluded). See par. 4-18Current Limit. Moreover,fuses or circuit breakers can be used to provide the overcurrent protection in the installation. Overcurrent protection must always be carried out accordingto 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 recommend using the following fuses, which will ensure compliance with EN50178:In case of malfunction, not following the recommendation may result in unnecessary damage to the adjustable frequency drive.Adjustable Frequency DriveTypeMax. fuse size 1) 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 200–240 V type gG11K 80A 200–240 V type gG15K–18K5 125A 200–240 V type gG22K 160A 200–240 V type aR30K 200A 200–240 V type aR37K 250A 200–240 V type aR1) Max. fuses - refer to national/international regulations to select an appropriate fuse size.3 How to InstallVLT® AutomationDrive FC 300 InstructionManual3-14 MG.33.AC.22 - VLT® is a registered Danfoss trademark3