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Ndrive HL User’s Manual
Installation and Configuration
www.aerotech.com 2-7
2.4. Motor and Feedback Connections
The Ndrive HL can be integrated into a system using three basic configurations: DC
Brush (Velocity and Torque mode), brushless or stepper motors. Brush and brushless
motors may have two feedback devices.
2.4.1. DC Brush Motor in Torque Mode Configuration
The DC brush motor configuration is shown in Figure 2-5. See section 2.5.1. for the
correct encoder phasing information if Aerotech’s standard cabling is not used.
Figure 2-5.
DC Brush Motor in Torque Mode Configuration
2.4.1.1.
DC Brush Motor Phasing
If an Aerotech motor is used with Aerotech provided cabling, no motor phasing process
is required.
A DC brush motor is phased correctly, when a positive motion command causes
clockwise (CW) motor rotation, as viewed looking at the motor from the front mounting
flange. This assumes the CntsPerMetricUnit/CntsPerEnglishUnit/CntsPerRotaryUnit axis
parameters are set to a positive value. This required phasing, is determined solely by
which motor lead is connected to the ØA and ØC motor terminals. Motor phasing is
unrelated to the resultant direction of motion commanded from within a motion program.
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 parameters.
To determine this, connect a voltmeter to the motor leads of an un-powered motor.
Rotate the motor by hand clock-wise (CW). Swap the voltmeter connections to the motor
until the voltmeter indicates a positive voltage. The motor lead now connected to the
positive lead of the voltmeter, is the + motor lead as indicated in the Figure above, and
should be connected to the ØA motor terminal. The other motor lead connects to the ØC
motor terminal.
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