Descriptions of functions
10.20 Thermal overload protection for the DC motor (I2t monitoring of the motor)
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
583
Table 10- 69 Parameter settings for I
2
t monitoring
Time constant [s] with which I
2
t monitoring is to operate
p50100 Rated armature current Determination of permissible continuous current for motor:
Permissible continuous current = p50100 × p50113
Continuous-current factor
p50140 Motor I
2
t monitoring, response
when starting
Sets the response when starting for the motor I
2
t monitoring:
2: Start I
2
t at zero
2
t with the saved value (factory setting)
Advance-alarm characteristic/Shutdown characteristic
If, for example, the motor load is continuously at approximately 125% of the permissible
continuous current for the motor, alarm A60037 responds after a time constant (p50114) has
elapsed. If there is no reduction in the load, the drive is shut down when the shutdown
characteristic is reached, and error message F60137 is displayed.
Advance-alarm/shutdown times for other loads may be taken from the diagram below.
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