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Functions, monitoring and protective functions
9.5 Monitoring functions and protective functions
Thermal motor model 2 (for induction motors)
Thermal motor model 2 is used for induction motors. It is a thermal 3-mass model.
This makes thermal motor protection possible even for operation without temperature sensor
or with the temperature sensor deactivated (p0600 = 0).
Commissioning the motor model
The thermal 3-mass model is activated with p0612.1 = 1. An expansion makes the motor
model more precise; this can be additionally activated using p0612.9 = 1.
Note
When commissioning the motor, the expansion of thermal motor model (p0612.9 = 1) is
automatically activated.
Motor model settings
The total motor mass is entered 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
Entering the temperatures:
● 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 following 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
In operation with a KTY or PT1000 sensor, the calculated temperature value of the 3-mass
model is continuously corrected to track the measured temperature value. After the
temperature sensor is switched off (p0600 = 0 or p0601 = 0), the last temperature value
continues to be used as basis for the calculation.
708
Operating Instructions, 12/2018, A5E36652151A
Enclosed Drives
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