© ElectroCraft 2018
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CPP-A12V80A-SA-USB Technical Reference
7.4 Motor Temperature Sensor
A motor over-temperature protection function is provided by the drive. The drive is designed to be
compatible with standard Electrocraft motors equipped with a thermistor temperature sensor. However
the drive is capable of interfacing with any resistance based temperature sensor that meets the following
criteria.
•
The resistance of the temperature sensor decreases with increasing temperature.
•
The resistance at the maximum motor temperature is 1k
Ω
(typical).
•
The sensor is isolated from any voltage sources (the drive provides the necessary excitation)
This sensor is commonly a thermistor or a normally open temperature switch that closes at the desired
shutdown temperature. If motor over temperature function is not used, the connections must be left open.
Contact the factory for applications with temperature sensors that do not match these specifications.
7.4.1 Temperature Sensor Connections
Temp Sensor
Temp Sensor
Motor
J3
Drive
J3
Figure 19: Temperature sensor connection to the drive
7.4.2 Temperature Sensor Signal Input Circuit
Motor
Temperature
Input
+5V
100
KΩ
+
_
100
KΩ
4700pF
100
KΩ
100
KΩ
1
KΩ
+5V
1uF
680
Ω
Figure 20: Temperature sensor signal input circuit