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Until this routine is completed or deactivated, the drive will not allow normal operation or parameter saving. It is most common during: : When a new motor is being set up. siemens fault 0a7991
If no PLC is present, set (No protocol) and perform a power cycle. Troubleshooting Tips How can resolve the alarm Code A7991 - Siemens SiePortal : Until this routine is completed or deactivated,
A: No – the fault prevents damage. It trips before excessive current melts windings. However, repeated fault cycles can stress the insulation. siemens fault 0a7991