Lincoln Electric INVERTEC SVM129-B - Manual (Page 39)

Section F-1 Section F-1
INVERTEC® STT® & STT® II
Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide .......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide .................................................................................................F4 - F-12
Test Procedures ...................................................................................................................F-13
T1 Auxiliary Transformer Test........................................................................................F-13
T4 Auxiliary Transformer Test........................................................................................F-19
Input Rectifier Test.........................................................................................................F-25
Capacitor Balance Test .................................................................................................F-29
Switch Board Test..........................................................................................................F-33
Snubber Resistors Test .................................................................................................F-37
Power Board Test ..........................................................................................................F-41
Protection Board Test ....................................................................................................F-45
Trigger Circuit Test ........................................................................................................F-49
Replacement Procedures ....................................................................................................F-53
IGBT Module Removal and Replacement.....................................................................F-53
Switch Board Replacement ...........................................................................................F-59
Capacitor Removal and Replacement Procedure.........................................................F-65
Output Rectifier Removal and Replacement.................................................................F-73
Retest After Repair...............................................................................................................F-77
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION
Return
to
Master
T
OC
Return
to
Master
T
OC
Return
to
Master
T
OC
Return
to
Master
T
OC