Siemens SINAMICS DCM Operating Instructions Manual page 554

Descriptions of functions
10.20 Thermal overload protection for the DC motor (I2t monitoring of the motor)
Alarm and fault initiation from the motor I
The diagrams below show the time after which an alarm or fault is triggered when a new,
constant load is suddenly switched in following an extended period of preloading (> 5×T_th).
T_th = p50114 (motor thermal time constant)
y ...
x ...
Figure 10-67 I
552
Load current/permissible continuous current (p50100 × p50113)
time/thermal time constant of motor
2 t monitoring of the motor: Alarm triggering
t monitoring
2
Operating Instructions, 12/2018, A5E34888669A
SINAMICS DCM Control Module