Siemens SINAMICS S120, Function Manual

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Monitoring functions and protective functions
9.5 Thermal motor protection
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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9.5.1.2 Thermal motor model 2
Thermal motor model 2 is used for induction motors.
Enter the total motor mass in p0344.
● p0625 = ambient temperature
● p0626 = overtemperature, stator iron
● p0627 = overtemperature, stator winding
● p0628 = rotor winding temperature rise
The motor temperatures are calculated on the basis of motor measured values. The
calculated temperatures are indicated in the parameters:
● r0630 Motor temperature model ambient temperature
● r0631 Motor temperature model stator iron temperature
● r0632 Motor temperature model stator winding temperature
● r0633 Motor temperature model rotor temperature
When operated with an additional KTY84 or PT1000 temperature sensor, the calculated
temperature value from thermal motor model 2 is continuously corrected to track the
measured temperature value. After deactivating the temperature sensor with p0600 = 0, the
calculation continues with the last measured temperature value.
Commissioning the motor model
You activate the thermal motor model 2 with p0612.01 = 1. The expansion makes the motor
model more precise. You can additionally activate this expansion using p0612.09 = 1.
Note
When commissioning the motor, the expansion of thermal motor model 2 (p0612.09 = 1) is
automatically activated.
9.5.1.3 Thermal motor model 3
Thermal motor model 3 is only intended for certain Siemens motors, which do not have their
own integrated temperature sensors. Thermal motor model 3 is a thermal 3-mass model. It is
activated with p0612.02 = 1. The necessary parameters are automatically transferred when
commissioning via DRIVE-CLiQ.
Note
When commissioning, thermal motor model 3 is automatically set after selecting the intended
Siemens motor (p0301). The parameters are set to values appropriate for the particular
motor type.