Emerson Control Techniques Epsilon Eb Series Reference Manual page 183

Epsilon Eb and EN Drives Reference Manual
Figure 120: User Defined Motor Single Ended Feedback Connections
Thermal Switch Interfacing
The drive provides a facility to monitor the motor thermal sensor and shut the drive down in
the event of a motor overtemp condition. This must be connected properly in order to enable
the protection. If your motor does not have a thermal sensor, the sensor input pin needs to be
connected to GND (connect pin 9 to pin 18). The thermal sensor requirements are as follows:
• If a thermistor is used, it must be a PTC (positive temperature coefficient) or it must
increase in resistance as the temperature increases. The cold resistance should be 500
ohms or less. A motor fault will occur when the thermistor resistance reaches
approximately 1.0 kohm.
• Switch Operation: open circuit on temperature rise
• Voltage rating min: 10 VDC
• Current capacity min: 1 mA
Encoder Logical Interfacing
The encoder is expected to provide six logical signals: A, B, Z, U, V and W. Each of these
signals is received at the drive by a differential receiver circuit. For example, the A logical
signal is received as channels A and /A.
Signals A and B provide incremental motor position in quadrature format. Z is a once per
revolution marker pulse. U, V and W are commutation tracks.
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