Siemens SINAMICS S120 Configuration Manual page 90

Motor components
5.1 Thermal motor protection
The built-in KTY temperature sensor protects the motors against overload up to I
There is no adequate protection for thermally critical load situations, e.g. a high overload at
motor standstill. For this reason, additional protection in the form, for example, of a thermal
overcurrent relay must be provided.
The temperature sensor is designed so that the DIN/EN requirement for "protective
separation" is fulfilled.
If the user carries out an additional high-voltage test, then the ends of the temperature
sensor cables must be short-circuited before the test is carried out! If the test voltage is
connected to only one temperature sensor terminal, then it will be destroyed.
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WARNING
WARNING
Configuration Manual, (APH4S), 08/2008, 6SN1197-0AD64-0BP1
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max
1PH4 Induction Motors