In the context of Siemens SINAMICS drives (such as the G120 or S120), Fault Code F7902 signals that the motor has stalled
The drive triggers this fault when the deviation between the calculated motor speed and the actual speed exceeds a specific threshold for a set amount of time. sinamics drive motor fault 7902 - SiePortal - Siemens
| Root Cause | Solution |
|------------|----------|
| PLC in STOP | Set PLC to RUN or reconfigure drive to ignore missing telegram (p2040 = 0 – not recommended for safety) |
| p2040 too short | Increase p2040 to at least 2–3× bus cycle time |
| Loose connector | Reseat or replace bus connector |
| Wrong telegram type | Match p0922 with PLC configuration (e.g., standard telegram 1 for speed control) |
| No termination | Activate termination on both ends of PROFIBUS segment |
| EMI | Check cable routing, add ferrites, verify shield grounded at both ends |
| Faulty option board | Replace communication board (e.g., CBE20 for PROFINET) |
Need further assistance? Consult the official Siemens manual for your specific drive model (function diagrams 8010–8020 for output monitoring). For hands-on help, Siemens Technical Support can provide remote diagnostic assistance using Starter or STARTER software to trace current waveforms in real time.
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In the context of Siemens SINAMICS drives (such as the G120 or S120), Fault Code F7902 signals that the motor has stalled
The drive triggers this fault when the deviation between the calculated motor speed and the actual speed exceeds a specific threshold for a set amount of time. sinamics drive motor fault 7902 - SiePortal - Siemens
| Root Cause | Solution |
|------------|----------|
| PLC in STOP | Set PLC to RUN or reconfigure drive to ignore missing telegram (p2040 = 0 – not recommended for safety) |
| p2040 too short | Increase p2040 to at least 2–3× bus cycle time |
| Loose connector | Reseat or replace bus connector |
| Wrong telegram type | Match p0922 with PLC configuration (e.g., standard telegram 1 for speed control) |
| No termination | Activate termination on both ends of PROFIBUS segment |
| EMI | Check cable routing, add ferrites, verify shield grounded at both ends |
| Faulty option board | Replace communication board (e.g., CBE20 for PROFINET) |
Need further assistance? Consult the official Siemens manual for your specific drive model (function diagrams 8010–8020 for output monitoring). For hands-on help, Siemens Technical Support can provide remote diagnostic assistance using Starter or STARTER software to trace current waveforms in real time.
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