Siemens A01790 fault code meaning

Series: G120-CU240B-E-2, G120-CU250S-2, G120C, G120D

SI: Start aborted by STO via terminal

converter

Meaning: At start, the control unit's auto internal self-test cannot be completed because pulse enable is missing. The "Execute STO via power module terminals" function may be in use, with STO selected in at least one hardware shutdown path.

Possible causes

Source: SINAMICS G120 Control Unit CU240B- 2_CU240E- 2 P826; SINAMICS G120, Control Unit CU250S-2 P997; SINAMICS G120C P664; SINAMICS G120D Control Unit CU240D- 2_CU250D- 2 P854