Rockwell Automation 1398-DDM-xxx USE MNL/ULTRA 200 DIG.SERVO.DR - Manual (Page 272)

Publication 1398-5.0 – October 1998
D-8 Creating Custom Motor Files
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.
Hall Offset
The Hall offset specifies the offset of the Hall feedback signals
relative to the Allen-Bradley standard. The drive uses the Hall offset
to determine the commutation angle at startup. Hall offset is specified
as a value in the range from 0 to 359 electrical degrees.
Figure D.4 Index Offsets
Intro Intro
Intro (a) Allen-Bradley Index Location (0
o
Offset) (b) Non-Standard Index Location (30
o
Offset)