Protecting The Motor By Calculating The Motor Temperature - Siemens sinamics G120 Operating Instructions Manual
Low voltage inverters chassis devices with cu250s-2 control units and encoder evaluation
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- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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6.6.3
Protecting the motor by calculating the motor temperature
The inverter calculates the motor temperature based on a thermal motor model with the
following properties:
● The inverter calculates the motor temperature:
– In thermal motor model 1, the inverter calculates the temperature in the stator winding.
– In thermal motor models 2 and 3, the inverter calculates the temperatures in the rotor
● The thermal motor model detects temperature increases much faster than a temperature
sensor.
● After switching off the supply voltage, the inverter saves the most-recently calculated
difference to the ambient air temperature (factory setting: p0610 = 12). After switching the
supply voltage on again, the thermal motor model starts with 90% of the previously saved
difference temperature.
If you use the thermal motor model together with a temperature sensor, e.g. a PT1000, the
inverter corrects the model using the measured temperature.
Converter with CU250S-2 Control Unit
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
and in the stator winding.
Advanced commissioning
6.6 Protection functions
257
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