Siemens A01678 fault code meaning
Siemens / A01678
Series: G120-CU240B-E-2, G120-CU250S-2, G120C
SI: A mandatory fault check for "Execute STO via the power module terminals" is required
converter
Meaning: The set time (p9661) for the forced fault check used to monitor the "STO via power module terminals" function has been exceeded. When the "STO via power module terminals" function is deselected again, the message disappears and the monitoring time is reset.
Possible causes
Source: SINAMICS G120 control unit CU240B- 2_CU240E- 2 P815; SINAMICS G120, control unit CU250S-2 P985; SINAMICS G120C P663