The most "correct" way to clear this alarm is to allow the drive to perform its identification. : Issue a "Start" or "Run" command to the drive.
: Motor stalled—frequently happens if the motor identification was skipped or performed incorrectly. By following these steps, you can ensure your Siemens SINAMICS siemens fault 0a7991 best
The drive is in a commissioning mode where it is measuring the motor's electrical characteristics (resistance, inductance, etc.) to optimize performance. Why it shows up: The most "correct" way to clear this alarm
: Using V/f control is less precise than vector control, but it will clear the alarm and let you run the drive immediately. Pro-Tips from the Field By following these steps, you can ensure your
: Perform a "RAM to ROM" copy to ensure settings are permanently stored and the alarm clears on the next start. Clarification
Ensure the motor shaft rotates freely and there are no jams in the machinery.
, which may indicate that the PLC is not correctly signaling the drive to start or that the network connection is lost. Siemens SiePortal Are you experiencing this fault during initial setup or has it appeared on a running machine Fault A07991 cannot be cleared on SINAMICS G120C drive