ABB ACSM1 Firmware Manual page 43

The figure below shows typical KTY84 sensor resistance values as a function of the
motor operating temperature.
KTY84 scaling
90 °C = 936 ohm
110 °C = 1063 ohm
130 °C = 1197 ohm
150 °C = 1340 ohm
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
connected to other equipment
or
- the temperature sensor must be isolated from the I/O terminals.
The figure below shows a motor temperature measurement when thermistor input
TH is used.
One PTC or KTY84 sensor
Motor
T
10 nF
Three PTC sensors
Motor
T T
T
ohm
3000
2000
1000
0
-100
JCU Control Unit
TH
AGND
JCU Control Unit
TH
AGND
10 nF
0 100 200 300
Drive control and features
43
T (°C)