Program features 81
Temperature monitoring using PTC sensors
A PTC sensor can be connected between +24 V and digital input DI6 of the drive, or
to an optional encoder interface module FEN-xx.
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 figure and table below show typical PTC sensor resistance values as a function
of the motor operating temperature.
For the wiring of the sensor, refer to the Hardware Manual of the drive.
Temperature monitoring using Pt100 sensors
A Pt100 sensor can be connected to AI1 and AO1 on the JCU Control Unit, or to the
first available AI and AO on the optional FIO-11 I/O extension module.
The analog output feeds constant current 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 to degrees centigrade.
For the wiring of the sensor, refer to the Hardware Manual of the drive.
100
550
1330
4000
Ohm
T
Temperature PTC resistance
Normal 0…1 kohm
Excessive >
4 kohm*
*The limit for overtemperature
detection is 2.5 kohm.
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