ABB ACSM1 Series, Firmware Manual, Page: 39 / 334

Drive control and features
39
Temperature sensors
It is possible to detect motor overtemperature by connecting a motor temperature
sensor to thermistor input TH of the drive or to optional encoder interface module
FEN-xx.
Constant current is fed through the sensor. The resistance of the sensor increases
as the motor temperature rises over the sensor reference temperature
T
ref
, as does
the voltage over the resistor. The temperature measurement function reads the
voltage and converts it into ohms.
The figure below shows typical PTC sensor resistance values as a function of the
motor operating temperature.
The figure below shows typical KTY84 sensor resistance values as a function of the
motor operating temperature.
It is possible to adjust the motor temperature supervision limits and select how the
drive reacts when overtemperature is detected.
WARNING! As the thermistor input on the JCU Control Unit is not insulated
according to IEC 60664, the connection of the motor temperature sensor requires
double or reinforced insulation between motor live parts and the sensor. If the
assembly does not fulfil the requirement,
- the I/O board terminals must be protected against contact and must not be
100
550
1330
4000
Ohm
T
Temperature PTC resistance
Normal 0…1.5 kohm
Excessive > 4 kohm
1000
2000
3000
ohm
T ( ° C)
KTY84 scaling
90 °C = 936 ohm
110 °C = 1063 ohm
130 °C = 1197 ohm
150 °C = 1340 ohm
-100
0
0 100 200 300