Motor Protection By Calculating The Temperature; Thermal Motor Model 2 For Induction Motors - Siemens SINAMICS G120XA Operating Instructions Manual

6.7.4

Motor protection by calculating the temperature

Overview
The converter calculates the motor temperature based on a thermal motor model.
The thermal motor model responds far faster to temperature increases than a temperature
sensor.
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.
Function description

Thermal motor model 2 for induction motors

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 - both in the
rotor as well as in the stator winding.
Figure 6-70
Parameters
Table 6-67
Number
r0034
r0068[0 ... 1]
p0344[M]
p0604[M]
p0605[M]
p0610[M]
p0612[M]
p0625[M]
p0627[M]
r0632[M]
p0640[D]
Further information is provided in the parameter list.
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Thermal motor model 2 for induction motors
Thermal motor model 2 for induction motors
Name
CO: Thermal motor load
CO: Absolute actual current value
Motor weight (for thermal motor model)
Mot_temp_mod 2/KTY alarm threshold
Mot_temp_mod 1/2/sensor threshold and temperature value 145 °C
Motor overtemperature response
Mot_temp_mod activation
Motor ambient temperature during commissioning
Motor overtemperature, stator winding
Mot_temp_mod stator winding temperature
Current limit
Advanced commissioning
6.7 Drive protection
Factory setting
- %
- Arms
0 kg
130 °C
12
0000 0010 0000
0010 bin
20 °C
80 K
- °C
0 Arms
307