Siemens Fault 0a7991 – Popular

Running a basic setup script through software like Startdrive or Starter automatically schedules a motor identification run.

Seeing an unfamiliar code like "0a7991" on your Siemens drive can be confusing. To clarify right away, in many Siemens documentation and panel displays. Therefore, "0a7991" is almost universally interpreted as alarm code A7991 (A07991) , a standard notification on Siemens SINAMICS series drives indicating that the Motor Data Identification function is activated .

After the alarm clears, perform a copy to ensure the settings are saved and the alarm does not return after a reboot.

If no PLC is present, set (No protocol) and perform a power cycle. Troubleshooting Tips How can resolve the alarm Code A7991 - Siemens SiePortal siemens fault 0a7991

Based on Siemens documentation and technical support resources, the following are possible causes of fault code 0A7991:

Alarm A07991 indicates that the drive is waiting to perform or is currently performing a motor data identification run (also known as a "tuning" or "ID run").

Depending on how the Motor ID routine was configured, you may experience one of two behaviors: Running a basic setup script through software like

Perform a "Motor Identification at Standstill" (p1910). This allows the drive to measure the electrical characteristics of the motor.

: If parameter data is not permanently stored from volatile memory (RAM) to non-volatile memory (ROM), the drive reverts to an uncommissioned state after power-cycles. Step-by-Step Fixes for Alarm A07991 1. Complete the Standard Motor Identification Run

Based on user reports and technical documentation, the following are possible causes of the Siemens fault code 0A7991: Troubleshooting Tips How can resolve the alarm Code

This method allows the drive to perform the calibration, improving motor control and efficiency.

In the world of industrial automation, Siemens SINAMICS drives (such as the G120, G120C, and S120 series) are renowned for their reliability and advanced diagnostic capabilities. However, when a drive signals an alarm or fault, it is crucial to understand what it means to minimize downtime.

The drive triggers this state during basic commissioning or when parameter adjustments command it to execute a stationary or rotating "auto-tune" sequence. The code is prevalent across the entire Siemens SINAMICS line, including the . Root Causes of Alarm A07991