Positioning Overview; Common Guidelines For All Applications - Allen-Bradley PowerFlex 525 User Manual

Positioning Overview

Common Guidelines for All
Applications
A quadrature encoder provides rotor speed and direction. Therefore, the
IMPORTANT
encoder must be wired such that the forward direction matches the motor
forward direction. If the drive is reading encoder speed but the position
regulator or other encoder function is not working properly, remove power to
the drive and swap the A and A (NOT) encoder channels or swap any two motor
leads. Drives will fault when an encoder is incorrectly wired and
Fdbk Type] is set to 5 "Quad Check".
The PowerFlex 525 drive includes a simple position regulator which can be used
in a variety of position applications without the need for multiple limit switches
or photo-eyes. This can be used as a stand-alone controller for simple
applications (up to 8 positions) or in conjunction with a controller for more
flexibility.
Please note that this is not intended to replace high end servo controllers or any
application that needs high bandwidth or very high torque at low speeds.
The position regulator can be configured for operation appropriate for a variety
of applications. Certain parameters will need to be adjusted in all cases.
P047 [Speed Reference1] must be set to 16 "Positioning".
A535 [Motor Fdbk Type] must be set to the match the feedback device.
Positioning mode must use
A535 [Motor Fdbk Type] Options
0 "None" indicates no encoder is used. This can not be used for
positioning.
1 "Pulse Train" is a single channel input, no direction, speed feedback
only. This should not be used for positioning. The Single Channel
selection is similar to a Pulse Train, but uses the standard encoder scaling
parameters.
2 "Single Chan" is a single channel input, no direction, speed feedback
only. This should not be used for positioning. Single channel uses the
standard encoder scaling parameters.
3 "Single Check" is a single channel input with encoder signal loss
detection. The drive will fault if it detects that the input pulses do not
match the expected motor speed. This should not be used for positioning.
4 "Quadrature" is a dual channel encoder input with direction and speed
from the encoder. This may be used for positioning control.
Rockwell Automation Publication 520-UM001A-EN-E - February 2013
Encoder/Pulse Train Usage and Position StepLogic Application
A535 [Motor Fdbk Type] option 4.
Appendix E
A535 [Motor
189