Danfoss VLT FC 100 Service Manual

Also see for VLT FC 103: Service guide Installation guide Installation guide Operating guide Installation guide

Contents

Danfoss VLT FC 100 Service Manual Manual pdf 111 page image

7.4.16 SCR Input Bus Bars1 2 3 456789101112130BX455.10Figure 7.18 SCRs and SCR Input Bus Bars1 Inrush card 7 T30 screw2 0.6 in [16 mm] standoff 8 T50 screw3 Inrush support bracket 9 SCR4 T40 screw 10 (+) DC bus bar5 (-) DC bus bar 11 SCR input bus bar6 Gate lead 12 0.7 in [19 mm]standoffTable 7.18 Legend to Figure 7.181. Remove the inrush card in accordance withchapter 7.4.15 Inrush Card.2. Remove two screws (T20) from the middle of theinrush card mounting bracket.3. Remove two standoffs (0.6 in [16 mm]) from theinrush card mounting bracket.4. Remove three standoffs (0.7 in [19 mm])connecting the bus bars to the SCR modules, onefor each SCR input bus bar.5. Remove the bus bars.Reinstall in reverse order of this procedure and tightenhardware according to chapter 1.7 General TorqueTightening Values.NOTICE!Note for reassembly: Fasten all components hand-tightand then place the inrush support to align all beforetightening the fasteners.7.4.17 SCRs1. Remove the SCR input bus bars in accordancewith chapter 7.4.16 SCR Input Bus Bars.2. Remove the (+) DC bus bar by removing thethree screws (T50), one from each SCR module.3. Remove the (-) DC bus bar by removing the onescrew (T30) and three screws (T50), one fromeach SCR modle.4. Disconnect the gate leads, one from each SCRmodule.5. Remove one screw (T30) from each of the fourcorners of each SCR module.For reassembly, follow the replacement SCR instructions.7.4.18 DC Bus Rails7.4.18.1 Without Optional Brake133245678910130BX456.10Figure 7.19 DC bus rails without brake option1 (+) DC bus rail 6 (-) DC bus rail2 IGBT module 7 T40 IGBT terminalscrew3 IGBT output bus bar 8 0.4 in [10 mm] nut4 T25 IGBT mounting screw 9 Snubber capacitor5 T40 IGBT terminal screw 10 T20 screwTable 7.19 Legend to Figure 7.19Disassembly and Assembly In... Service ManualMG94A222 Danfoss A/S © Rev. 2014-02-10 All rights reserved. 1097 7