Cause : Precharging DC link time monitoring comes when the power unit DC link was not able to be pre-charged within the expected time.

F30027 fault in siemens 6RA80 DC Drive indicate Precharging DC link time monitoring. This means the line contactor/line side switch has not been closed.

1. Check the line supply voltage at the input terminals.
2. Check the line supply voltage setting (p0210).
3. Check the connections of the external line contactor.