Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 241)

TROUBLESHOOTING CHAPTER 10
1557-UM050F-EN-P – June 2013
TABLE OF CONTENTS
Introduction ................................................................................................................ 1
Recommended Tools and Equipment ............................................................................. 1
Documenting Shutdowns ................................................................................................ 2
Printed Circuit Card Replacement ................................................................................... 2
Line Side Control Board Replacement ............................................................................ 3
Line and Machine Side Control Board Test Points .......................................................... 5
Line and Machine Side Control Board Test Point Waveforms ......................................... 6
Firmware Change Out Procedure ................................................................................... 8
Power Semiconductor Testing ...................................................................................... 10
Thyristor Clamps ........................................................................................................... 10
SCR Gate Driver Board Calibration / Gate Pulse Verification Procedure ...................... 11
GTO Gate Driver Board Calibration / Gate Pulse Verification Procedure
800 or 1500 Amp Devices ...................................................................... 14
3000 Amp Devices ................................................................................. 17
Checking Clamp Force
Snubber Diode ....................................................................................... 19
Machine side converter and Line side converter .................................... 20
Adjusting Clamp Pressure
Snubber Diode, Machine side converter and Line side converter ........... 20
Power Semiconductor and Component Replacement
Replacing Thyristors - Line side converter ............................................. 21
Replacing Thyristors - Machine side converter ...................................... 24
Replacing Snubber Diodes .................................................................... 28
GTO and SCR Replacement Instruction Sheet ..................................... 29
Replacing Snubber Capacitors .............................................................. 31