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5-13
5-4 Full Closing Control
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
5
BASIC CONTROL Mode
Reference
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
6
) pps = 4.00 m/s.
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.
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.
Precautions for Correct Use
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.
Parameter
number
Parameter name
Explanation
Setting
range
Unit
Pn324
External Feedback
Pulse Dividing
Numerator
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.
0 to
1048576
Pn325
External Feedback
Pulse Dividing
Denominator
Set the denominator of the external
encoder divider setting. Normally, set the
number of external encoder output
pulses per motor rotation.
1 to
1048576
Pn324 Encoder resolution per motor rotation [pulse]
=
Pn325 External encoder resolution per motor rotation [pulse]