Siemens Alarm A07991 (or A7991) on SINAMICS G120/S120 drives indicates that Motor Data Identification (ID) is active, requiring a motor ID run or manual adjustment to clear. The condition is resolved by running a motor identification, setting parameter P1900 to 0, or bypassing calculations via P340 during commissioning. For detailed solutions and forum discussions, visit Siemens SiePortal Dealing with Motor ID ( code 7991 ) - SiePortal - Siemens
If the code persists or is accompanied by other errors, consider these related Siemens drive faults: F7900: Motor blocked or speed controller at its limits. siemens fault 0a7991
According to Siemens Technical Support documentation (List Manuals), fault code 0A7991 falls under the umbrella of "Motor blocked" or "Vapor lock" . Depending on the application: Siemens Alarm A07991 (or A7991) on SINAMICS G120/S120
Perform a RAM to ROM save to ensure settings are preserved after power-down. Manually Deactivate the Routine: r0021 (Actual speed) r0027 (Absolute current) r0031 (Actual
To clear this alarm and enable the drive for normal operation, you must either complete the identification routine or manually deactivate it. Complete the Identification Routine: