Thermal Overload Protection For The Dc Motor (I2T Monitoring Of The Motor) - Siemens SINAMICS DCM Operating Instructions Manual

Descriptions of functions

10.17 Thermal overload protection for the DC motor (I2t monitoring of the motor)

10.17 Thermal overload protection for the DC motor (I2t monitoring of the
motor)
I t monitoring protects the motor against impermissible loads.
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CAUTION
No full motor protection
I t monitoring only provides an approximate representation of the motor's thermal image.
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If the electronics power supply fails, then the calculated preload of the motor is lost. When
switching-on again, the system assumes an unloaded motor!
For p50114 = 0, the I
Adaptation
Table 10- 22 Parameter settings for I2t monitoring
Parameter
p50114 Thermal time constant
p50100 Rated armature current
p50113 Continuous-current factor
Advance-alarm characteristic/Shutdown characteristic
If, for example, the motor load is constantly at around 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.
432
t monitoring is disabled.
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Data
Time constant [s] with which I
Determination of permissible continuous current for motor:
Permissible continuous current = p50100 × p50113
t monitoring is to operate
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Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
SINAMICS DCM DC Converter