Danfoss VLT FC 360 Design Manual

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Contents

Danfoss VLT FC 360 Design Manual Manual pdf 75 page image

6.3 Fuse Specifications6.3.1 FusesIt is recommended to use fuses and/or circuit breakers onthe supply side as protection in case of component break-down inside the frequency converter (first fault).NOTEThis is mandatory in order to ensure compliance with IEC60364 for CE or NEC 70 for UL.WARNINGPersonnel and property must be protected against theconsequence of component break-down internally in thefrequency converter.Branch circuit protectionTo protect the installation against electrical and fire hazard,all branch circuits in an installation, switch gear, machinesetc., must be protected against short-circuit and over-current according to national/international regulations.NOTEThe recommendations given do not cover Branch circuitprotection for UL.Short-circuit protectionDanfoss recommends using the fuses/circuit breakersmentioned below to protect service personnel andproperty in case of component break-down in thefrequency converter.6.3.2 RecommendationsWARNINGIn case of malfunction, not following the recommendationmay result in personnel risk and damage to the frequencyconverter and other equipment.Table 6.4 and Table 6.5 list the recommended fuses andcircuit breakers which have been tested.If fuses/circuit breakers according to recommendations arechosen, possible damages on the frequency converter willmainly be limited to damages inside the unit.6.3.3 CE ComplianceFuses or circuit breakers are mandatory to comply with IEC60364. Danfoss recommend using a selection of thefollowing.The fuses in Table 6.4 and Table 6.5 are suitable for use ona circuit capable of delivering 100,000 Arms (symmetrical),480 V depending on the frequency converter voltagerating. With the proper fusing the frequency convertershort circuit current rating (SCCR) is 100,000 Arms.Frame Size Power [kW] gGJ10.37-1.1101.52.2J23.0254.05.5J3 7.5 32J4 11-15 50J5 18.5 8022J6301603745J7 55 25075Table 6.4 CE Fuse, 380-480 V, Frame Sizes J1-J7The circuit breakers in Table 6.5 are suitable for use on acircuit capable of delivering 35,000 Arms (symmetrical), 480V depending on the frequency converter voltage rating.With the proper fusing the frequency converter shortcircuit current rating (SCCR) is 35,000 Arms.Frame Size Power [kW] EATONJ1 0.37-2.2 MollerPKZM0-16J2 3.0-5.5 NZMN-1-A-25J3 7.5 NZMN-1-A-32J4 11-15 NZMN-1-A-50J5 18.5-22 NZMN-1-A-80J6 30-45 NZMN-1-A-160J7 55-75 NZMN-1-A-250Table 6.5 CE Circuit Breakers, 380-480 V, Frame Sizes J1-J7Specifications VLT® AutomationDrive FC 360 Design GuideMG06B202 - VLT® is a registered Danfoss trademark 736 6