Siemens Fault 0a7991 — [verified]

Apply a (start signal) to initiate the routine.

Ensure the motor is safe to move if a "Rotating Measurement" was selected. Once finished, the alarm will clear itself. 2. Manually Disable the Routine

: While this alarm is active—especially if a rotating measurement is selected—you may be unable to save parameter assignments to the ROM until the process finishes. Common Troubleshooting Steps siemens fault 0a7991

: If testing the drive standalone, set p2030 = 0 (No protocol) and perform a "RAM to ROM" save. Technical Summary Table Default/Action Description p1900 Set to 0 Disables the motor identification routine. p0971 Set to 1

If you do not wish to perform the identification (e.g., during bench testing without a motor), you can disable it via the Siemens Parameter List : Apply a (start signal) to initiate the routine

Saves parameters from RAM to ROM (perform after clearing alarm). Set to 0

: Ensure the Profinet/Profibus cable is securely plugged in and the PLC is powered on. during bench testing without a motor)

If you are performing a without the final motor, attaching a smaller spare motor can sometimes bypass identification faults by providing enough feedback for the drive to initialize. Alarms A 7991 and A8526 - SiePortal - Siemens