IB-11B012 INDUSTRIAL INDEXING SYSTEMS, INC.
USER'S GUIDE MOTION CONTROL SYSTEM, MSC-250
1 - 4 DESCRIPTION MARCH 2003
The components of the basic indexing drive system form two information loops. The
position loop is a closed-loop which consists of the controller, drive, motor, and feedback
device. The controller, continually compares motor position, derived from the feedback
pulses received from the drive, with the desired position calculated within the controller.
Any difference between calculated position and actual position results in a corrective
command signal being sent to the drive. The drive then corrects motor position by
adjusting its velocity loop. The objective of the position loop is to keep the actual position
equal to the commanded position.
The velocity loop is also a closed-loop system. The drive continually compares motor
velocity, derived from the feedback device, with the magnitude of the command signal
generated by the controller. Any difference causes the drive to alter the current to the
motor, which in turn changes the motor velocity. The objective of the velocity loop is to
keep actual velocity equal to commanded velocity.
The position loop and velocity loop are independent loops, but the controller uses the
velocity loop to achieve movement to the desired position. When data is received by the
controller specifying a movement, the controller calculates the time required to accelerate
to maximum speed and to decelerate from maximum speed. It then calculates the time at
maximum speed necessary to complete the movement. This information is then
transmitted to the drive by the controller.
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