Siemens SIMOTICS T-1FW6 - 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 3-9 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
)
150°C±5K
130°C±5K
80°C±5K
Resistance when cold R (20 °C) in the PTC triplet
and in the individual PTC temperature sensor
See characteristic
at-20°C<T<ϑ
NAT
-20K
R≤3x250Ω+1x250Ω
R≤1000Ω
Description
3.4Design
1FW6 built-in torque motors
54 Operating Instructions, 09/2022, A5E52220812B AA