Siemens F31115 fault code meaning
Siemens / F31115
Series: G120-CU250S-2
Encoder 1: Signal A or B amplitude error (A^2 + B^2
converter
Meaning: The amplitude of encoder 1 (the square root of A^2 + B^2) is outside the permissible tolerance.
Possible causes
Source: SINAMICS G120 Control Units CU250S-2 P1146