Parameter p1900 was actively set to 1 (Identification at standstill) or 2 (Rotating measurement).
Note: If you need specific pinouts for your motor model (e.g., 1PH7 vs 1FK7), consult the motor nameplate datasheet or the SINAMICS List Manual. siemens fault 0a7991 best
You have changed the motor configuration (P0300-P0311) and the drive requires a re-identification. Parameter p1900 was actively set to 1 (Identification
Since this alarm is a procedural notification, clearing it is a matter of telling the drive what to do next. There are a couple of best paths you can take. Since this alarm is a procedural notification, clearing
Set P1900 to an appropriate value (e.g., 1 for identification at standstill, or 2 for identification with rotation).
[p1900 = 2] ➔ [Issue ON Command] ➔ [Wait 15s for Current Injection] ➔ [p1900 Auto-Resets to 0] ➔ [Execute RAM-to-ROM Save] Method B: Disabling the Motor Identification Routine
Siemens fault code 0a7991 (A07991) is a powerful feature, not a problem. By understanding its function as a "motor data identification activated" notification, you can transform a simple status message into a tool for optimizing drive performance and troubleshooting hardware issues.