Siemens Fault 0a7991 !!exclusive!! -

: A food processing plant using a SINAMICS G120 to drive a dough mixer reports recurring fault 0A7991 every morning at first start, but runs fine rest of the day.

The drive will inject a controlled current into the stator windings. The system will run silent stationary measurements for roughly 10 to 30 seconds. siemens fault 0a7991