The drive is receiving an active "OFF" command while you are trying to start the identification process.
A: You cannot "ignore" it in the sense that the drive will be waiting for your command. Until you either perform the identification or deactivate it, the alarm will be displayed. You can clear it by performing the motor identification or deactivating it as described above.
The drive's has a high-speed internal data bus (often referred to as the "internal DRAM bus" or "backplane communication"). This bus handles real-time data exchange between the microprocessor, memory, I/O interfaces, and firmware modules. siemens fault 0a7991 best
If your motor was already commissioned and the alarm appears after a power cycle, the drive might be expecting a repeat measurement.
The motor nameplate data entered into the drive does not align with the physical motor connected. The drive is receiving an active "OFF" command
If you’ve tried the steps above and 0A7991 returns immediately, look at the : a failing encoder or loose ribbon cable to the CU can sometimes masquerade as this parameter error.
: If the drive is stuck and the alarm won't clear, try a factory reset and re-enter basic motor settings before attempting the "Run" command again. You can clear it by performing the motor
How can resolve the alarm Code 7991 and 8526 - SiePortal - Siemens
Issue – Fault A07991 cannot be cleared on SINAMICS G120C drive
The isn’t a "broken" fault, but rather a digital pause: it means Motor Data Identification is Active . Think of it as your drive asking for a quick introduction to the motor it's about to spin.
According to technical support documentation on the Siemens SiePortal , the common steps to clear this alarm include: