: Motor stalled—frequently happens if the motor identification was skipped or performed incorrectly. By following these steps, you can ensure your Siemens SINAMICS
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.
: For testing without a motor, set p0340 = 0 to remove the requirement for motor data. 3. Resolving Persistent Alarms siemens fault 0a7991 best
means: A critical data packet did not arrive within the expected time window (timeout). The drive's safety logic interprets this as a loss of deterministic control, so it triggers a fault (not just a warning) and typically shuts down the drive to prevent erratic behavior or damage.
If you have a twin drive/motor setup:
Once the measurement completes, the drive will automatically set , and the alarm will disappear. Disable the Function Manually :
In Siemens automation, typically refers to a "Motor data identification activated" warning. This occurs when the drive is waiting for a measurement of the motor's electrical characteristics, usually during the initial commissioning phase. Resolution Steps If you have a twin drive/motor setup: Once
Siemens fault A07991 is an alarm indicating that "Motor data identification is activated"