Siemens F66 fault code meaning
Siemens / F66
Series: 6RA28
Thyristor cannot be triggered (gate G26) (fault information applicable only to four-quadrant rectifiers
DC drive
Meaning: Possible causes: Open gate circuit wiring, an electronic board fault, a gate circuit board fault, or an interruption in the internal gate circuit of the thyristor.
Possible causes
Source: 6RA28 Chinese Manual P87