Siemens Fault 0a7991 [Secure | 2024]

If you cannot run the identification (e.g., the motor is connected to a load that cannot move), set manually. Permanent Save :

Apply a standard via your PLC, terminal blocks, or the drive operating panel.

To clear the alarm and return to normal operation, you must either complete the identification or manually deactivate it: How can resolve the alarm Code 7991 and 8526 - SiePortal siemens fault 0a7991

The most effective way to clear the code is to allow the drive to perform its automated diagnostic routine.

. This means the drive is waiting to measure the electrical characteristics of the connected motor to optimize its control performance. The Meaning of Alarm A07991 If you cannot run the identification (e

Navigate to the commissioning folder in your software (e.g., TIA Portal or STARTER). Select and trigger .

For experienced technicians, resolving this is straightforward by either completing the identification run or disabling the parameter. For beginners, it can be confusing because the drive will not run normally until this "active" state is cleared. Select and trigger

: The drive will not start normal operation until this identification is completed or disabled.

In industrial automation, high-performance variable frequency drives (VFDs) require precise knowledge of a motor's internal resistance and inductance to operate efficiently. When you see

"I/O access error when updating the process image input table. The module is either defective, incorrectly parameterized, or not physically present."

: Changing critical motor data (like rated voltage or current) may automatically trigger a request for a new identification run. Interrupted Identification