Installation and Configuration
Npaq MR Hardware Manual
2.3.3. Stepper Motor Connections
The configuration shown in
is an example of a typical stepper motor connection. Refer to
for information on motor phasing.
In this case, the effective motor voltage is half of the applied bus voltage. For example, an 80V motor bus
supply is needed to get 40V across the motor.
1
2
3
4
5
B’
B
A
A’
Stepper
Motor
Note the common connection of A and B phases.
Motor Frame
Figure 2-11:
Stepper Motor Configuration
2.3.3.1. Stepper Motor Phasing
N O T E :
If using standard Aerotech motors and cables, motor and encoder connection adjustments are
not required.
A stepper motor can be run with or without an encoder. If an encoder is not being used, phasing is not
necessary. With an encoder, test for proper motor phasing by running a positive motion command.
If there is a positive scaling factor (determined by the CountsPerUnit parameters) and the motor moves in a
clockwise direction, as viewed looking at the motor from the front mounting flange, the motor is phased
correctly. If the motor moves in a counterclockwise direction, swap the motor leads and re-run the
command.
Proper motor phasing is important because the end of travel (EOT) limit inputs are relative to motor rotation.
Motor Mounting
Flange (Front View)
Motor Shaft
ROTARY MOTOR
POSITIVE MOTION
Figure 2-12:
Clockwise Motor Rotation
N O T E :
After the motor has been phased, use the ReverseMotionDirection parameter to change the dir-
ection of “positive” motion.
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Chapter 2
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