8-29
8-4 Analog Control Parameters
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
8
Parameters Details
Check the number of encoder pulses per motor rotation and number of external encoder pulses
per motor rotation, and set External Feedback Pulse Dividing Numerator (Pn324) and External
Feedback Pulse Dividing Denominator (Pn325).
Set Pn324 to 0 to have encoder resolution automatically set as numerator.
Refer to "5-4 Full Closing Control (P.5-9)".
Precautions for Correct Use
If this ratio is incorrect, the deviation between the position calculated from encoder pulses and
position calculated from external encoder pulses increases. Particularly when the moving distance
is long, an excessive deviation error occurs.
Reference
In the example below: ball screw pitch in 10 mm, encoder in 0.1
m/pulse, and encoder
resolution in 20 bits (or 1048576 pulses)
The direction of external encoder feed back count can be reversed.
Refer to "5-4 Full Closing Control (P.5-9)".
Explanation of Set Values
Pn324
External Feedback Pulse Dividing Numerator
Setting
range
0 to 1048576
Unit
Default
setting
0
Data
attribute
R
Full closing
Pn325
External Feedback Pulse Dividing Denominator
Setting
range
1 to 1048576
Unit
Default
setting
10000
Data
attribute
R
Full closing
=
Encoder resolution per motor rotation [pulse]
External encoder resolution per motor rotation [pulse]
Pn324
Pn325
=
Encoder resolution per motor rotation [pulse]
External encoder resolution per motor rotation [pulse]
Pn324
Pn325
100000
1048576
=
Pn326
External Feedback Pulse Direction Switching
Setting
range
0 to 1
Unit
Default
setting
0
Data
attribute
R
Full closing
Set
value
Description
0
External encoder feedback pulse count direction non-reverse
1
External encoder feedback pulse count direction reverse
