Siemens F27 fault code meaning
Siemens / F27
Series: 6RA28
USS telegram fault at G-SST1
DC drive
Meaning: Valid in all run states after the first valid telegram is received. Operating mode: After the first valid telegram is received, no subsequent telegram is received within the time set by parameter P75. Possible fault causes: USS Master fault/error.
Possible causes
Source: 6RA28 Chinese Manual P80