Thermal Motor Model 2; Thermal Motor Model 3 - Siemens SINAMICS S120 Function Manual

Monitoring and protective functions
9.5 Thermal motor protection
9.5.1.2

Thermal motor model 2

The thermal motor model 2 is used for induction motors. It is a thermal 3-mass model.
The thermal 3-mass model is activated with p0612.01 = 1. Enter the total motor mass in
p0344. The 3-mass model splits up the total motor mass as follows:
● p0617 = thermally active iron mass (stator): laminated cores and frame) as a percentage
of p0344
● p0618 = thermally active copper mass (stator: windings) as a percentage of p0344
● p0619 = thermally active rotor mass (rotor) as a percentage of p0344
● p0625 = ambient temperature
● p0626 = overtemperature, stator iron
● p0627 = overtemperature, stator winding
● p0628 = rotor winding temperature rise
Motor temperature rises are calculated on the basis of motor measured values. The
calculated temperature rises 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 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.
9.5.1.3

Thermal motor model 3

Thermal motor model 3 is intended exclusively for use with motors with the 1FK7Basis
design. This motor design has no integrated temperature sensors. The 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.
Motor temperature rises are calculated on the basis of motor measured values. The
calculated temperature rises are indicated in the parameters:
● r0034 thermal motor load
● 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
554
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions