Descriptions of functions
10.20 Thermal overload protection for the DC motor (I2t monitoring of the motor)
SINAMICS DCM DC Converter
584 Operating Instructions, 12/2018, A5E34763375A
Alarm and fault initiation from the motor I
2
t monitoring
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)
Load current/permissible continuous current (p50100 × p50113)
Time/thermal time constant of motor
Figure 10-67 I
2
t monitoring of the motor: Alarm triggering
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