Siemens SINAMICS G220 - Motor Protection for Synchronous Motors by Means of Temperature Calculation, Model 3

14.11.16.15 Motor protection for synchronous motors by means of temperature calculation,
Model 3
Overview
The converter calculates the motor temperature at di󹪜erent points on the motor based on a
thermal motor model.
Description of function
Thermal motor model 3 for synchronous motors is a thermal 3-mass model, consisting of stator
core, stator winding and rotor. Thermal motor model 3 calculates the temperatures in the stator
core, rotor and stator winding.
Thermal motor model 3 works without temperature measurement support.
Parameters
The following list contains the parameters of the "Motor protection by means of temperature
calculation" function.
Number Name Unit
p5350[0...n] Mot_temp_mod 1/3 boost factor at standstill 
p5351[0...n] Mot_temp_mod 3 stator power loss o󹪜set [W]
p5352[0...n] Mot_temp_mod 3 stator power loss linear n-dependent [W min/1000]
p5353[0...n] Mot_temp_mod 3 stator power loss square law n-dependent [W min²/1000²]
p5354[0...n] Mot_temp_mod 3 stator power loss stator linear n-dependent [W/A]
p5355[0...n] Mot_temp_mod 3 stator power loss stator square law I-
dependent
[W/A²]
p5370[0...n] Mot_temp_mod 3 stator thermal capacity [kW sec/K]
p5371[0...n] Mot_temp_mod 3 stator winding thermal capacity [kW sec/K]
p5372[0...n] Mot_temp_mod 3 rotor thermal capacity [kW sec/K]
p5375[0...n].0...1 Additional motor overload protection con󹪝guration 
p5380[0...n] Mot_temp_mod 3 stator/ambient thermal conductivity
(standstill)
[W/K]
p5381[0...n] Mot_temp_mod 3 stator/stator winding therm. conduct.
coe󹪟cient
[W/K]
p5382[0...n] Mot_temp_mod 3 stator/rotor coe󹪟cient of thermal
conductivity
[W/K]
p5383[0...n] Mot_temp_mod 3 stator/surrounding therm. cond. coe󹪜. lin. n-
dep
[W min/(1000 K)]
p5384[0...n] Mot_temp_mod 3 stator/surrounding therm cond. coe󹪜 sq-law
n-dep
[W min²/(1000² K)]
p5385[0...n] Mot temp mod 1 current limit characteristic gradient [Arms min]
r5386[0...5] Mot_temp remaining time until fault [s]
r5387[0...n] Mot_temp_mod 3 timer [s]
c5388 Motor temperature inhibit current reduction 
r5389.0...8 Mot_temp status word faults/alarms 
p5390[0...n] Mot_temp_mod 1/3 alarm threshold [°C]
p5391[0...n] Mot_temp_mod 1/3 fault threshold [°C]
Functions
14.11Drive functions
SINAMICS G220 converter
636 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB