Rockwell Automation 4100 REC Resolver to Encoder Converter Installation and Setup Manual - Manual (Page 36)

Publication 999-126 - February 1996
Setup 29
5. Select Motor/Encoder Test. A black circle appears in the radio
dial next to the text.
6. Select Execute. Refer to your GML Programming Manual and
your motion controller’s Installation and Setup/User Manual for
more information on Motor/Encoder Tests.
Aligning the Absolute Transducer
After you have completed the Motor/Encoder Test, you need to align
the resolver package position to the axis position. Using the Align
Absolute Transducer procedure, you can randomly attach the
transducer to the physical axis. You do not need to match the actual
position of the resolver package to the actual position of the axis
because the alignment routine reads the position relative to the actual
position of the axis and then compensates this position relative to the
actual position of the axis. After the alignment procedure completes
successfully, the axis and resolver package are adjusted to read zero at
this position.
If you are using a dual resolver package, the alignment procedure will
also synchronize both internal resolver elements by electronically
offsetting them to zero. This eliminates the need for the user to
manually perform this procedure. To align the absolute transducer:
1. Select Align Absolute Transducer. A black dot appears in the
radio dial next to the text.
Important: If the axis is not still when you align or home the
resolver package the position information will be
incorrect. The axis must be still before performing the
alignment procedure.
Important: When executing the alignment procedure on a servo
axis, feedback is momentarily disabled and then enabled
again (if the error checking features do not detect an
error) in the motion controller. If the axis has stored
energy or the ability to move during the time feedback is
disabled, you have to apply a breaking mechanism to the
axis before you execute an alignment routine.
For single resolver packages, the alignment routine reads the absolute
position of the transducer. If no encoder noise or loss faults occur, the
routine completes successfully. The motion controller negates the
read position and stores it in its working memory. For absolute
devices, the home position is used as a home offset and is added to the
transducer’s actual position during a homing command.