14.11.16.14 Motor protection for induction motors by means of temperature calculation,
Model 2
Overview
The converter calculates the motor temperature based on a thermal motor model.
Description of function
The thermal motor model 2 for induction motors is a thermal 3-mass model, consisting of stator
core, stator winding and rotor. Thermal motor model 2 calculates the temperatures in both the
rotor and the stator winding.
The converter responds more quickly to a temperature change when the temperature is
calculated based on the thermal motor model compared to when it is measured with a
temperature sensor.
After commissioning, the converter sets the thermal motor type that is suitable for the motor.
If you use the thermal motor model together with a temperature sensor, e.g. a Pt1000, the
converter corrects the model using the measured temperature.
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Figure14-206 Thermal motor model 2 for induction motors
Parameters
The following list contains the parameters of the "Motor protection by means of temperature
calculation" function.
Number Name Unit
p0344[0...n] Motor weight (for the thermal motor model) [kg]
p0605[0...n] Mot_temp_mod 1/2 sensor threshold and temperature value [°C]
p0610[0...n] Motor overtemperature response
p0612[0...n].0...2 Mot_temp_mod activation
p0617[0...n] Stator thermally relevant iron component [%]
p0618[0...n] Stator thermally relevant copper component [%]
p0619[0...n] Rotor thermally relevant weight [%]
p0625[0...n] Motor ambient temperature during commissioning [°C]
p0626[0...n] Motor overtemperature, stator core [K]
p0627[0...n] Motor overtemperature, stator winding [K]
p0628[0...n] Motor overtemperature rotor [K]
r0630[0...n] Mot_temp_mod ambient temperature [°C]
r0631[0...n] Mot_temp_mod stator iron temperature [°C]
r0632[0...n] Mot_temp_mod stator winding temperature [°C]
Functions
14.11Drive functions
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 633
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