Siemens F48 fault code meaning

Series: 6RA28

Two or more thyristors cannot be triggered (MII

DC drive

Meaning: Possible causes for a single-quadrant rectifier: Incorrect setting of parameter P81 or P99. Possible causes for a four-quadrant rectifier: Armature circuit interruption (check the DC fuse, motor supply wires, and brushes); ribbon cable X101 interruption; electronic board fault.

Possible causes

Source: 6RA28 Chinese Manual P85