Siemens SINAMICS S120 Function Manual page 356

Monitoring and protective functions
8.5 Thermal motor monitoring
Thermal motor monitoring with the 3-mass model for induction motors (p0300 = 1xx, p0301 = 1xxxx)
The 3-mass model is used to protect induction motors against overload in vector or servo
control, whereby the temperatures of different motor components (stators, cores, rotors) can
be determined indirectly. See also function diagram 8016 "Thermal motor monitoring".
Activation
The thermal 3-mass model is activated by setting p0612.1=1.
Note
If alarm thresholds of thermal motor monitoring systems are exceeded, the user can set
parameterizable response options (p0610) that enable continued operation (e.g. with
reduced power) and prevent immediate shutdown.
Thermal motor monitoring on third-party motors
Thermal monitoring for third-party motors is only supported with KTY/PTC temperature
sensors. The adjustable parameters (p0611, p0615) required for the thermal I
must be taken from the technical specifications supplied the motor and adjusted accordingly.
Function diagrams (see SINAMICS S120/S150 List Manual)
● 8017 Thermal I2t motor model
● 9576 Temperature evaluation KTY/PTC
● 9577 Sensor monitoring KTY/PTC
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p0600[0...n] Motor temperature sensor for monitoring
● p0601[0...n] Motor temperature sensor type
● p0604[0...n] Motor overtemperature alarm threshold
● p0605[0...n] Motor overtemperature fault threshold
● p0606[0...n] Motor overtemperature timer stage
● p0607[0...n] Temperature sensor fault timer stage
● p0610[0...n] Motor overtemperature reaction to upper temperature limit
● p0611[0...n] Winding time constant
● p0615 Trip limit motor overtemperature thermal model
● p0616[0...n] Motor overtemperature alarm threshold 1
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Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
t motor model
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Drive functions