Siemens SINAMICS G120 Operating Instructions Manual page 296

Alarms, faults and system messages
12.4 List of alarms and faults
Number Cause
F30037 Rectifier overtemperature
A30049 Internal fan defective
F30059 Internal fan defective
F30074 Communications fault between
Control Unit and Power Module
A30502 DC link overvoltage
A30920 Temperature sensor fault
A50001 PROFINET configuration error
A50010 PROFINET name of station
invalid
A50020 PROFINET: Second controller
missing
For further information, please refer to the List Manual.
294
Remedy
See F30035 and, in addition:
Check the motor load.

Check the line phases

Check the internal fan and if required replace.
Check the internal fan and if required replace.
The 24V voltage supply of the converter (terminals 31 and 32) was
interrupted briefly.
Please check the voltage supply and the wiring.
Check the device supply voltage (p0210).

Check the line reactor dimensioning

Check that the sensor is connected correctly.
A PROFINET controller is attempting to establish a connection with a faulty
configuration telegram. Check to see whether "Shared Device" is activated
(p8929 = 2).
Correct name of station (p8920) and activate (p8925 = 2).
"Shared Device" is activated (p8929 = 2). However, only the connection to a
PROFINET controller is present.
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
SINAMICS G120C frequency converter