Motor Protection By Calculating The Temperature - Siemens SINAMICS G120C USS/MB Operating Instructions Manual
Sinamics g120c series low voltage converter built-in units with frame sizes aa - f
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- Operating instructions manual (478 pages) ,
- Compact operating instructions (92 pages) ,
- Getting started (68 pages)
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6.24
Motor protection by calculating the temperature
The inverter 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 you are using the thermal motor model together with a temperature sensor, e.g. a Pt1000,
then the inverter corrects the model based on the measured temperature.
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 6-60
Table 6-55
Parameter Description
r0068
p0610
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
Thermal motor model 2 for induction motors
Thermal motor model 2 for induction motors
CO: Absolute actual current value
Motor overtemperature response (factory setting: 12)
0:
Alarm A07012
The inverter does not reduce the current limit.
1:
Alarm A07012 and fault F07011
The inverter reduces the current limit.
2:
Alarm A07012 and fault F07011
The inverter does not reduce the current limit.
12:
Alarm A07012 and fault F07011
The inverter does not reduce the current limit.
After switching off the supply voltage, the inverter saves the most-recently calculated
difference to the ambient air temperature. After switching the supply voltage on
again, the thermal motor model starts with 90 % of the previously saved difference
temperature.
6.24 Motor protection by calculating the temperature
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