Configuration Manual Synchronous Motors 1FT6 - Siemens ...

Motor Components (Options)
4.1 Thermal motor protection
Caution
The integrated temperature sensor protects the synchronous against an overload condition
Shaft heights, 28 to 48 up to 2 ∙ I060 K and speed 0
from shaft height 63 up to 4∙ I0 60 K and speed 0
For load applications that are critical from a thermal perspective - e.g. overload when the
motor is stationary or an overload of 4 ∙ M0 longer than 4 s, adequate protection is no longer
available. This is the reason that additional protection must be provided.
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Figure 4-1 Resistance characteristic of the KTY 84 as a function of the temperature
1FT6 synchronous motors
4-2 Configuration Manual, (PFT6), Edition 12.2004, 6SN1197-0AD12-0BP0