Thermal Motor Protection - Siemens SINAMICS G150 Operating Instructions Manual

9.4.5

Thermal motor protection

9.4.5.1 Description
Description
The priority of thermal motor protection is to identify critical situations. Possible reactions can
be assigned (p0610) and used when alarm thresholds are exceeded to enable continued
operation (e.g., with reduced power) and prevent immediate shutdown.
● Effective protection is also possible without a temperature sensor (p0600 = 0 or
p4100 = 0). The temperatures of different motor components (stators, core, rotors) can be
determined indirectly using a temperature model.
● Connecting temperature sensors allows the motor temperature to be determined directly.
In this way, accurate start temperatures are available immediately when the motor is
switched on again or after a power failure.
9.4.5.2 Temperature sensor connection at the customer terminal block TM31 (option G60)
Temperature measurement via KTY
The device is connected to terminals X522:7 (Temp+) and X522:8 (Temp-) on the customer
terminal block (TM31) in the forward direction of the diode. The measured temperature is
limited to between –140 °C up to +188.6 °C and is available for further evaluation.
● Activating the motor temperature measurement via the external sensor: p0600 = 10
If the customer terminal block TM31 (option G60) is available and after commissioning
has been completed, the source for the external sensor is set to the customer terminal
block (p0603 = {TM31} r4105).
● Set the KTY temperature sensor type: p4100 = 2.
Temperature measurement via PTC
The connection is made to user terminal block (TM31) at terminal X522:7/8. The threshold
for changing over to an alarm or fault is 1650 Ω. If the threshold is exceeded, the system
switches internally from an artificially-generated temperature value of -50° C to +250° C and
makes it available for further evaluation:
● Activating the motor temperature measurement via the external sensor: p0600 = 10
If the customer terminal block TM31 (option G60) is available and after commissioning
has been completed, the source for the external sensor is set to the customer terminal
block (p0603 = {TM31} r4105).
● Set the PTC temperature sensor type: p4100 = 1.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Functions, monitoring, and protective functions
9.4 Monitoring and protective functions
579