Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 132)

5-52 Understanding IMC-S/23x Setups
Publication 999-122 - January 1997
1. Verify that it is the right one for the absolute transducer and
accompanying converter card.
2.
The alignment procedure reads the absolute position of the transducer.
If no encoder noise or loss faults have occurred during this time, the
routine completes successfully. The read position is negated and placed
into the Home Position variable in the IMC-S/23x working memory.
For absolute devices, use Home Position as a home offset, which is
added to the actual position of the transducer during a homing
command.
For example, assume the actual position of the absolute transducer is
1. After alignment, the home offset (Home Position) variable will be
equal to -1 and the axis position is 1 + (-1) = 0. Assume the axis is
moved one unit and the position of the absolute transducer is now 2. If
a home command is issued at this point, the axis position will be 2 +
(-1) = 1.
If the alignment routine is successful, the following message appears
on the IMC-S/23x:
The alignment procedure is complete and the home offset (Home
Position) has been updated in the IMC-S/23x working memory. If an
encoder loss or encoder noise fault has occurred during the alignment
procedure, the following message appears:
If this is the case, the IMC-S/23x has detected an encoder type fault.
This can be caused by:
If: Then:
It is not The alignment procedure may be incorrect.
1. Select the appropriate Homing Procedure.
2. Go back to the Align Absolute Transducer
Procedure section.
3. Repeat the procedure.
It is Move the axis to its minimum travel position and press ENTER to
align the transducer to the zero position of the axis. This position is
defined as zero by the alignment procedure. The following message
appears.
(It takes abouttwo seconds to align a transducer).
Please Wait
Alignment Completed OK
*** Encoder Loss or Noise Detected
*** Check Transducer Hookup