ABB ACQ580, Firmware Manual

Page: 90 / 422

86 Program features
The figure below shows typical PTC sensor resistance values as a function of
temperature.
One isolated PTC sensor can also be connected directly to digital input DI6. At the
motor end, the cable shield should be earthed through a capacitor. If this is not
possible, leave the shield unconnected.
See section Insulation on page 85 .
Temperature monitoring using Pt100 sensors
1…3 Pt100 sensors can be connected in series to an analog input and an analog
output.
The analog output feeds a constant excitation current of 9.1 mA through the sensor.
The sensor resistance increases as the motor temperature rises, as does the voltage
over the sensor. The temperature measurement function reads the voltage through
the analog input and converts it into degrees Celsius.
It is possible to adjust the motor temperature supervision limits and select how the
drive reacts when overtemperature is detected.
See section Insulation on page 85 .
100
550
1330
4000
Ohm
T
M
T
Control board
DI6
+24 V DC