Omron R88D-KN ML2 Sries User Manual page 248

5-4 Full Closing Control
Maximum Input Frequency
 For example, the maximum speed when an external encoder with a resolution of 0.01 m is used for
the serial communication type is 0.01 m  (400  10
An overspeed error protection is generated, however, if the motor shaft rotation speed exceeds the
maximum speed.
External Feedback Pulse Dividing Ratio Setting (Pn324, Pn325)
Set the dividing ratio for the encoder resolution and external encoder resolution.
Parameter
number
5
Check the number of encoder feedback pulses and the number of external encoder output
pulses per motor rotation, and set External Feedback Pulse Dividing Numerator (Pn324) and
External Feedback Pulse Dividing Denominator (Pn325) so that the following formula works
out.
Pn324
Pn325
 If this divider setting is wrong, there will be deviations between the position calculated from
encoder pulses and the position calculated from external encoder. If the movement distance is
long, these deviations accumulate and cause an internal/external feedback pulse error counter
overflow level error.
5-13
Reference
Parameter name
External Feedback
Pn324 Pulse Dividing
Numerator
External Feedback
Pn325 Pulse Dividing
Denominator
Encoder resolution per motor rotation [pulse]
=
External encoder resolution per motor rotation [pulse]
Precautions for Correct Use
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
6
) pps = 4.00 m/s.
Explanation
Set the numerator of the external
encoder divider setting. Normally, set the
number of encoder output pulses per
motor rotation. If the set value is 0, the
encoder resolution is set automatically.
Set the denominator of the external
encoder divider setting. Normally, set the
number of external encoder output
pulses per motor rotation.
Setting
Unit
range
0 to

1048576
1 to

1048576