In Siemens support forums, you will often see A07991 discussed alongside another alarm: (PROFINET: Cyclic connection not established). They commonly appear together during the initial setup, especially when using a PLC for control.
Since this alarm is a procedural notification, clearing it is a matter of telling the drive what to do next. There are a couple of best paths you can take.
| | Recommended Action | Result | | :--- | :--- | :--- | | New User / Standard Commissioning | Perform the motor identification routine (Start command). Then set P0971 = 1 to save. | Drive is fully optimized, high torque accuracy, alarm clears automatically. | | Expert / Emergency Bypass | Set P1900 = 0 to deactivate the routine. CAUTION: Only use if you are sure the motor data is already correct. | Alarm clears immediately, but motor performance may be sub-optimal. | siemens fault 0a7991 best
: Give the drive a standard run command via your PLC or control panel. The drive will pass low-frequency currents through the motor windings for approximately 10 to 20 seconds without spinning the shaft.
: Set P1300 = 0 (standard V/f control).
A food packaging plant reported daily fault 0A7991 during morning startups on a G120C drive.
Alarm A07991 is triggered primarily through parameter . When active, the VFD alters its behavior: the next "Start" or "ON" command executes a diagnostic tuning routine rather than spinning the motor at an operational frequency. In Siemens support forums, you will often see
Siemens is a renowned brand in the industrial automation and electronics sector, offering a wide range of products and solutions. However, like any other complex equipment, Siemens devices can sometimes encounter faults and errors. One such fault code that has been reported by users is the Siemens fault 0A7991. In this article, we will delve into the details of this fault code, its causes, symptoms, and most importantly, provide a step-by-step guide on how to resolve it.
If the drive is in operation and you try to change parameters (p1910) while it has a speed setpoint, you will see 0A7991. There are a couple of best paths you can take
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