nuDrive Accessory User Guide
10
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Figure 5 shows the proper encoder phasing for CW (forward) motor
rotation.
Figure 5.
Encoder Signal Phasing, CW Rotation
Servo and closed-loop stepper applications require consistent directional
polarity between the motor and encoder for stable operation. The National
Instruments motion control standard directional polarity is as follows:
•
Positive = forward = clockwise (CW) facing motor shaft
•
Negative = reverse = counter-clockwise (CCW) facing motor shaft
Figure 6 shows the clockwise and counter-clockwise motor rotation.
Figure 6.
Clockwise and Counter-Clockwise Motor Rotation
When connecting the encoder wiring to your nuDrive accessory, you
should use shielded wire of at least 24 AWG. Both analog and digital noise
filters filter the encoder inputs in the nuDrive and on the motion controller
itself. You must use cables with twisted pairs and an overall shield for
improved noise immunity and enhanced encoder signal integrity. Figure 7
shows twisted pairs in a shielded cable.
Phase A
Phase B
Index
CCW
CW
Summary of Contents for nuDrive 2CF-001
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