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If an identification run is not possible (e.g., during a Factory Acceptance Test without the final motor), you can set parameter to inhibit the motor identification feature. Address Communication Blocks:
Here’s a technical support-style post regarding Siemens fault (often written as 0a7991 or A07991 depending on the drive family). siemens fault 0a7991
Are you seeing this on a or did it appear suddenly on a running machine ? Fault A07991 cannot be cleared on SINAMICS G120C drive If an identification run is not possible (e