Motor Protection For Synchronous Motors By Means Of Temperature Calculation, Model 3 - Siemens SINAMICS G220 Operating Instructions Manual

Functions
14.11 Drive functions
14.11.16.15 Motor protection for synchronous motors by means of temperature calculation,
Model 3
Overview
The converter calculates the motor temperature at different 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
p5350[0...n]
p5351[0...n]
p5352[0...n]
p5353[0...n]
p5354[0...n]
p5355[0...n]
p5370[0...n]
p5371[0...n]
p5372[0...n]
p5375[0...n].0...1
p5380[0...n]
p5381[0...n]
p5382[0...n]
p5383[0...n]
p5384[0...n]
p5385[0...n]
r5386[0...5]
r5387[0...n]
c5388
r5389.0...8
p5390[0...n]
p5391[0...n]
636
Name
Mot_temp_mod 1/3 boost factor at standstill
Mot_temp_mod 3 stator power loss offset
Mot_temp_mod 3 stator power loss linear n-dependent
Mot_temp_mod 3 stator power loss square law n-dependent
Mot_temp_mod 3 stator power loss stator linear n-dependent [W/A]
Mot_temp_mod 3 stator power loss stator square law I-
dependent
Mot_temp_mod 3 stator thermal capacity
Mot_temp_mod 3 stator winding thermal capacity
Mot_temp_mod 3 rotor thermal capacity
Additional motor overload protection configuration
Mot_temp_mod 3 stator/ambient thermal conductivity
(standstill)
Mot_temp_mod 3 stator/stator winding therm. conduct.
coefficient
Mot_temp_mod 3 stator/rotor coefficient of thermal
conductivity
Mot_temp_mod 3 stator/surrounding therm. cond. coeff. lin. n-
dep
Mot_temp_mod 3 stator/surrounding therm cond. coeff sq-law
n-dep
Mot temp mod 1 current limit characteristic gradient
Mot_temp remaining time until fault
Mot_temp_mod 3 timer
Motor temperature inhibit current reduction
Mot_temp status word faults/alarms
Mot_temp_mod 1/3 alarm threshold
Mot_temp_mod 1/3 fault threshold
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
Unit
[W]
[W min/1000]
[W min²/1000²]
[W/A²]
[kW sec/K]
[kW sec/K]
[kW sec/K]
[W/K]
[W/K]
[W/K]
[W min/(1000 K)]
[W min²/(1000² K)]
[Arms min]
[s]
[s]
[°C]
[°C]
SINAMICS G220 converter