Siemens SIMOTICS L-1FN3 - Technical Features of Temperature Sensors

3.4.4.2 Technical features of temperature sensors
Technical features of PTC temperature sensors
Every PTC temperature has a "quasi-switching" characteristic. The resistance suddenly increases
in the vicinity of the response threshold (nominal response temperature ϑ
NAT
).
PTC temperature sensors have a low thermal capacity - and have good thermal contact
with the motor winding. As a consequence, the temperature sensors and the system quickly
respond to inadmissibly high motor winding temperatures.
Table 3-10 Technical data of the PTC temperature sensors
Name Description
Type PTC triplet acc. to DIN44082
Individual PTC temperature sensor according to
DIN44081
Response threshold
(nominal response temperatureϑ
NAT
)
120°C±5K
PTC resistance R(20°C) at the PTC triplet See the characteristic
if-20°C<T<ϑ
NAT
-20K
R≤3x250Ω
R≤750Ω
Description
3.4Design
Naturally-Cooled 1FN3 Linear Motors
46 Operating Instructions, 06/2023, A5E52220465B AB