Siemens S120 configurationmanual Temp-F

Motor components of the built-in motor and options 3.2 Thermal motor protection

Note

The PTC thermistors do not have a linear characteristic and are, therefore, not suitable to determine the instantaneous temperature.

Temp–F

The temperature sensor circuit comprises a temperature sensor (KTY 84). For torque motors with integrated cooling, there is a KTY 84 temperature sensor between two phase windings. For torque motors with cooling jacket, there is a KTY 84 temperature sensor in a phase winding.

Function:

The KTY 84 has a progressive characteristic that is approximately linear (temperature resistance). Like the PTC elements in the Temp–S circuit, it also has a low thermal capacity and good thermal contact with the motor winding.

Temp–F is used to monitor the temperature.

WARNING

It is not permissible to evaluate the Temp–F to protect the motor.

The temperature is measured using Temp–F only between two phase windings or in one phase winding. If an overtemperature occurs in a phase winding that is not monitored, then this cannot be immediately displayed or evaluated. Further, the Temp–F has a slow characteristic and is not sufficient for fast tripping.

The individual phase windings have different current load levels and therefore different thermal loads if the motor is stationary or only slowly rotates but at the same time is generating a torque.

46	1FW6 Built-in torque motors
	Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3