4.1.7 Temperature sensors
One of the most important parameters for protecting a motor against overheating is the motor’s temperature.
The motor temperature should be monitored to prevent over-temperature and damage to the motor winding.
Several types of sensors are well known and widely used in the industry:
Resistance temperature detectors (RTDs)
Thermocouple
Thermistors
4.1.7.1 Resistance temperature detectors (RTDs)
RTDs are manufactured from metals whose resistance increases with temperature.
SOMANET servo drives can directly measure the voltage or resistance so RTDs like KTY84-130 and PT1000 can
be directly attached.
A wide range of RTD sensors can be measured by the temperature sensor input (SOMANET Circulo only) or
analog inputs.
4.1.7.2 Thermocouple
A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming an electrical
junction. A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect.
Note
The generated voltage by a thermocouple is not enough to be measured by analog inputs and require
an interface circuit (transducers) to increase the output voltage level.
4.1.7.3 Thermistors
PTC and NTC thermistors can be used as well, but NTC thermistors have the disadvantage that a wire brake
can be confused with low temperatures.
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