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Technical Details
Ndrive HL User’s Manual
3-14 www.aerotech.com
3.3.2. Hall-Effect and Thermistor Inputs
The Hall-Effect switch inputs are highly recommended for AC brushless motor
commutation but not absolutely required, see the Nview help for more information on
axis configuration. The Hall-effect inputs accept 5-24 volt DC logic signals. The pin
assignment for the connector is shown in the table below.
The thermistor input is used to detect an over temperature condition in a motor, via a
positive temperature coefficient device. That is, as the temperature of the device
increases, so does the resistance of the device. Under normal operating conditions, the
resistance of the thermistor is low (i.e., 100 ohms). This will be seen as a low input
signal. After the temperature causes the thermistor’s resistance to increase above 1K
ohms, the signal will be seen as a logic high, triggering an over temperature fault.
See Table 3-12 for the mating connector part number.
Table 3-14.
Hall-Effect Inputs Pin Assignment on Connector J207
Pin #
Label
Description
In/Out/Bi.
2
Thermistor
Motor over temperature Thermistor
Input
3
+5 Volt
+5 Volt Power for Encoder (500mA. max.)*
Output
5
Hall B
Hall Effect Sensor B (Brushless Motors only)
Input
10
Hall A
Hall Effect Sensor A (Brushless Motors only)
Input
11
Hall C
Hall Effect Sensor C (Brushless Motors only)
Input
21
Common
Signal Common for Encoder
N/A
* Total user +5 V power is limited to 500 mA, by an internal re-settable semiconductor fuse.
Figure 3-8.
Hall-Effect and Thermistor Inputs (J207)
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