Siemens SINAMICS G115D Operating Instructions Manual page 260

Advanced commissioning
6.20 Converter protection using temperature monitoring
In spite of the temporarily reduced pulse frequency, the maximum output current remains
unchanged at the value that is assigned to the pulse frequency setpoint. Also see p0290 = 2.
Once the overload condition has been removed, the converter increases the pulse frequency
back to the pulse frequency setpoint p1800.
If it is not possible to temporarily reduce the pulse frequency, or the measure cannot prevent
a power unit thermal overload, then the converter switches off the motor with fault F30024.
Overload response for p0290 = 12
The converter responds in 2 stages:
1. If you operate the converter with increased pulse frequency setpoint p1800, then the
converter reduces its pulse frequency starting at p1800.
There is no current derating as a result of the higher pulse frequency setpoint.
Once the overload condition has been removed, the converter increases the pulse
frequency back to the pulse frequency setpoint p1800.
2. If it is not possible to temporarily reduce the pulse frequency, or the risk of converter
thermal overload cannot be prevented, then stage 2 follows:
– In vector control, the converter reduces the output current.
– In U/f control, the converter reduces the speed.
Once the overload condition has been removed, the converter re-enables the output
current or speed.
If both measures cannot prevent a power unit thermal overload, then the converter switches
off the motor with fault F30024.
Overload response for p0290 = 13
We recommend this setting for drives with a high starting torque.
If you operate the converter with increased pulse frequency, then the converter reduces its
pulse frequency starting at the pulse frequency setpoint p1800.
There is no current derating as a result of the higher pulse frequency setpoint.
Once the overload condition has been removed, the converter increases the pulse frequency
back to the pulse frequency setpoint p1800.
If it is not possible to temporarily reduce the pulse frequency, or the measure cannot prevent
a power unit thermal overload, then the converter switches off the motor with fault F30024.
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Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
SINAMICS G115D distributed drive