Siemens F25 fault code meaning
Siemens / F25
Series: 6RA28
Fault in the armature voltage measurement circuit or the analog input signal measurement circuit.
DC drive
Meaning: Main reference (terminals 4 and 5), analog selection input (terminals 6 and 7), actual speed value (terminals 101–104). Possible causes: A1660 electronic board fault; input voltage for the "main reference" or "selection signal" greater than approximately 11.3V (measurement circuit overload).
Possible causes
Source: 6RA28 Chinese Manual P80