p0610[0...n] Motor overtemperature response
p0640[0...n] Motor current limit [Arms]
14.11.16.13 Motor protection for synchronous motors by means of temperature calculation,
Model 1
Overview
The converter calculates the motor temperature based on a thermal motor model.
Description of function
Thermal motor model 1 determines the motor temperature of synchronous and synchronous
reluctance motors from the continuous measurement of motor current and the thermal time
constant of the motor model.
If the thermal motor model is used together with a temperature sensor, e.g. a Pt1000, then
the converter corrects the model according to the measured temperature.
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 p612 is changed after commissioning, the alarm and fault thresholds p5390 and p5391
must be checked.
Parameters
The following list contains the parameters of the "Motor protection by means of temperature
calculation" function.
Number Name Unit
r0034 Motor utilization thermal [%]
r0035 Motor temperature [°C]
r0068[0...1] Absolute current actual value [Arms]
p0305[0...n] Rated motor current [Arms]
p0605[0...n] Mot_temp_mod 1/2 sensor threshold and temperature value [°C]
p0610[0...n] Motor overtemperature response
p0611[0...n] I2t motor model thermal time constant [s]
p0612[0...n].0...2 Mot_temp_mod activation
p0613[0...n] Mot_temp_mod 1/3 ambient temperature [°C]
p0625[0...n] Motor ambient temperature during commissioning [°C]
p0627[0...n] Motor overtemperature, stator winding [K]
p5390[0...n] Mot_temp_mod 1/3 alarm threshold [°C]
p5391[0...n] Mot_temp_mod 1/3 fault threshold [°C]
Functions
14.11Drive functions
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 631
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