Siemens A06921 fault code meaning
Siemens / A06921
Series: G110M, G115D, G120-CU240B-E-2, G120-CU250S-2, G120C, G120D, G120X, G130-G150, S120-S150
Braking resistor phase asymmetry
converter
Meaning: The three resistors of the brake are unbalanced. - DC bus voltage oscillation caused by load changes in the connected drives.
Possible causes
Source: SINAMICS G110M P700; SINAMICS G115D P758; SINAMICS G120, Control Unit CU240B-2_CU240E-2 P730; SINAMICS G120, Control Unit CU250S-2 P964; SINAMICS G120C P674; SINAMICS G120D Control Unit CU240D- 2_CU250D- 2 P864; SINAMICS G120X Converter P1371; SINAMICS G130_G150 P1596; SINAMICS S120_S150 P2723