Thermal Motor Monitoring - Siemens SINAMICS S120 Function Manual

Monitoring and protective functions

8.5 Thermal motor monitoring

8.5 Thermal motor monitoring
8.5.1 Thermal motor monitoring
Description
The purposes of thermal motor monitoring is to protect the motor against permanent
overload and excessive temperature.
The following steps are taken to achieve this:
● Pre-alarm by the thermal model
● Pre-alarm by sensors
● Shutdown by the thermal model
● Shutdown by sensors
● Display of estimated temperature
For synchronous motors with the following key factor:
● single-phase loading
● starting when cold
● starting when warm
...the I
See also function diagram 8017 "Thermal I
For induction motors, the 3-mass model is used to protect the motor against overloading in
both vector and servo control.
See also function diagram 8016 "Thermal motor monitoring".
Thermal motor models are not available for:
● 1FNx linear motors (variation in cooling method which affects the thermal model)
● 1FW6 torque motors (built-in motors)
Temperature measurement via KTY
The device is connected to terminals X522:7 (anode) and X522:8 (cathode) at the customer
terminal block (TM31) in the diode conducting direction. The measured temperature is
limited to between -48 °C and +248°C and is made available for further evaluation.
● Set the KTY temperature sensor type: p0601 = 2
● Activate motor temperature measurement via the external sensor: p0600 = 10
352
t motor model is used as a thermal model as of software version V2.6.
2
t motor model".
2
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions