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 1 kΩ internal pull-up resistor which corresponds to a trip voltage of +1.5 V.
Table 2-30: Thermistor Input Pin on the Feedback Connector
|
Pin # |
Description |
In/Out/Bi |
|---|---|---|
|
2 |
Motor Over Temperature Thermistor |
Input |
Figure 2-32: Thermistor Input Schematic (Feedback Connector)
