Siemens SINAMICS G120 Operating Instructions Manual page 355

Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
The time which expires up to shutdown is however not defined and depends on the
magnitude of the overload. Only the warning threshold can be changed in order to obtain
an earlier warning and, if required, externally intervene in the motor process (e.g. by
reducing the load, lowering the ambient temperature).
Note
If the inverter fan fails, this would be indirectly detected by the measurement of the
heatsink temperature.
A wire breakage or short circuit of the temperature sensor(s) is also monitored.
Functions
8.23 Power Module protection
8-159