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Installation and Configuration
Ndrive HP 10/20/30 Manual
2-18
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2.5.4. Stepper Motor Configuration
This mode is used with a stepper motor only. See Section 2.6.1, if Aerotech’s standard
cabling is not used, for information on correctly phasing the motor feedback devices.
Figure 2-15.
Stepper Motor Configuration
2.5.4.1. Stepper Motor Phasing Process
A stepper motor is phased correctly when a positive motion command causes the motor
to rotate in a clockwise (CW) direction, assuming a positive scaling factor, as determined
by the CntsPerMetricUnit/CntsPerEnglishUnit/CntsPerRotaryUnit axis parameter. To
correct the phasing, reverse the connections to the
θ
A and
θ
B terminals on the Ndrive
HP. This is important because the end of travel (EOT) limit inputs are relative to motor
rotation. After correctly phasing the motor, you may reverse the motor direction when
commanding a positive move from a motion program, by negating the sign of the
CntsPerMetricUnit/CntsPerEnglishUnit/CntsPerRotaryUnit axis parameter.
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