Siemens F18 fault code meaning
Siemens / F18
Series: 6RA28
The drive system does not reach rated speed despite maximum field weakening.
DC drive
Meaning: Applies only to an external field power supply unit. This fault can occur only when plotting the field characteristic curve. Possible causes: The response voltage P77 is set to < 120V; mismatch between the actual field current value and the reference.
Possible causes
Source: 6RA28 Chinese Manual P79