Aerotech Automation1 iXR3, Hardware Manual

Page: 51 / 112

2.3.3. Thermistor Input
The thermistor input is used to detect a motor over temperature condition by using a positive
temperature coefficient sensor. As the temperature of the sensor increases, so does the resistance.
Under normal operating conditions, the resistance of the thermistor is low which will result in a low
input signal. As the increasing temperature causes the resistance of the thermistor to increase, the
sensor will trigger an over temperature fault.
The thermistor is connected between Pin 2 and Signal Common. The nominal trip value of the sensor
is 1.385 kΩ. The circuit includes a 12 kΩ internal pull-up resistor which corresponds to a trip voltage
of +0.52 V.
Table 2-14: Thermistor Input Pin on the Feedback Connector
Pin # Description In/Out/Bi
2 Motor Over Temperature Thermistor Input
Figure 2-21: Thermistor Input Schematic (Feedback Connector)
iXR3/XR3 Hardware Manual 2.3.3. Thermistor Input
www.aerotech.com 51