Servodrives / inverters series COSMOS 301X Installation, use and maintenance manual - EN
5.7.13 Motor temperature sensor
The servo-drive is equipped with an input for reading the temperature sensors, which are often installed
inside the windings, in order to protect them in case of overheating. This peripheral device is designed to
acquire data from three different types of sensors:
• NTC, resistors whose resistance decreases as temperature increases
• PTC, resistors whose resistance increases as temperature increases
• Bi-metal switches, which open or close a contact when a temperature threshold is exceeded
The polarisation current is delivered directly by the servo-drive; it is simply necessary to connect the sensor
and program the servo-drive correctly. Since these sensors are not polarized, the two terminals can be
inverted with no adverse effect.
The servo-drive must be programmed with the correct parameters for the sensor; otherwise the temperature
value will be detected incorrectly. This may negatively affect the operation of the thermal protection system,
with the risk of damaging the motor.
Ver. 1.09 SMITECdd 54/74
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