Siemens: Drive Fault Code 7902 'link'

Consult Siemens Industry Online Support (entry ID: 109750131 for SINAMICS G120 fault codes) or your local Siemens service partner. For real-time help, use the Siemens Drive Monitor app to log fault buffer (r0945, r0949).

With the guidance in this article, you should be able to diagnose, repair, and eliminate Siemens Fault 7902, restoring your automated process with minimal downtime. Siemens Drive Fault Code 7902

For Siemens drives (such as G120 or S120), fault code indicates that the drive has detected a motor stall Consult Siemens Industry Online Support (entry ID: 109750131

A: No. Encoderless drives still detect stall via current and calculated speed. They may actually trip faster because they lack direct position feedback. For Siemens drives (such as G120 or S120),

: Verify if the motor can rotate freely and is not physically stalled by the load. Verify Connections

If you have completed all steps above—verified mains supply, replaced the contactor, checked the motor, corrected parameters, and still see 7902—you may be facing a rare firmware bug or internal component failure on the Power Module’s gate drive board. Contact Siemens Technical Support with the following ready:

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