Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 263)

Publication 1398-5.2 – PDF 1997
Creating Custom Motor Files D-9
Feedback Parameters
Linecount
The encoder linecount, or size, specifies the number of encoder lines
per mechanical revolution of the motor, and is required in units of
lines/mechanical revolution. The linecount value can be in the range
from 100 to 15000 lines/rev.
Note that the linecount value is in units of lines/rev, rather than counts/
rev. The number of lines/rev will be 1/4th of the number of counts/rev.
Index Offset
The index offset specifies the offset of the encoder index signal from
the Allen-Bradley standard, and is required in units of electrical
degrees. If the startup commutation type specifies that the index be
used for the final commutation angle measurement, then the drive uses
the index offset to determine the commutation angle when the index is
first located (the rising edge). The index offset value can be in the
range from 0 to 359 degrees.
For custom motor files, this parameter is not required. Set it to 0, since
only the Hall signals are needed for most custom motor files.
Figure D.4(a) shows the Allen-Bradley standard index location, and
Figure D.4(b) shows an example of a 30
o
index offset.
Figure D.4 Index Offsets
Intro Intro
Intro (a) Allen-Bradley Index Location (0 o Offset) (b) Non-Standard Index Location (30 o Offset)