Siemens Fault 0a7991 _top_ Site

The Siemens fault/alarm code means that Motor Data Identification (ID) is activated on your variable frequency drive (VFD). It is a standard status alarm—not a hardware breakdown—indicating that the drive is primed and waiting for a power-on command to perform a motor identification routine.

: Running basic setup steps via a Basic Operator Panel (BOP-2), Intelligent Operator Panel (IOP-2), or the TIA Portal software. siemens fault 0a7991

The drive will activate the motor to measure parameters. The alarm A07991 will clear once the measurement is complete (usually takes 10–30 seconds). The Siemens fault/alarm code means that Motor Data

In Siemens TIA Portal (Totally Integrated Automation) and STEP 7 classic environments, diagnostic alarms are often displayed as hexadecimal codes. Fault is not a general PLC stop error (like a watchdog or memory error); rather, it falls into the category of a diagnostic interrupt . The drive will activate the motor to measure parameters