ABB2 (4) 3BHS202077 ZAB E01 Rev. C ACS 6000 Maintenance ManualChapter 7 - Changing 7/9 MVA Phase Modules7-17.1 Required Tools and Accessories 7-17.2 Removing a Phase Module 7-27.3 Installing a Phase Module 7-5Chapter 8 - Changing Diodes and IGCTsin 7/9 MVA Phase Modules8-18.1 Required Tools and Accessories 8-18.2 Overview 8-28.3 Safety 8-48.4 Replacing Clamp and NP Diodes 8-58.4.1 Preparatory Steps 8-58.4.2 Replacing Clamp Diodes 8-8Upper Clamp Diode 8-8Lower Clamp Diode 8-98.4.3 Replacing NP Diodes 8-11Removing Upper NP Diode 8-11Removing Lower NP Diode 8-12Assembling the Stack 8-128.4.4 Finishing Steps 8-138.5 Replacing Free Wheeling Diodes 8-148.6 Replacing IGCTs 8-16Chapter 9 - Changing Thyristors in EXU9-19.1 Required Tools and Accessories 9-19.2 Safety 9-19.3 Replacing Thyristors in EXUs for Brushless Excitation 9-29.3.1 Preparatory Steps 9-29.3.2 Treating a New Thyristor before Installation 9-39.3.3 Mounting a New Thyristor 9-39.4 Replacing Thyristors in EXUs for Direct Excitation 9-59.4.1 Preparatory Steps 9-59.4.2 Treating a New Thyristor before Installation 9-69.4.3 Mounting a New Thyristor 9-69.5 Deflection Diagram 9-7Chapter 10 - Changing Semiconductors in VLU10-110.1 Required Tools and Accessories 10-110.2 Safety 10-110.3 Replacing the Semiconductors 10-2
