5-15
5-4 Full Closing Control
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
5
BASIC CONTROL Mode
External Feedback Pulse Error Setting (Pn328, Pn329)
The difference between the encoder position and external encoder position is detected, and if
the difference exceeds the value of Internal/External Feedback Pulse Error Counter Overflow
Level (Pn328), an error occurs.
Pn329: Internal/External Feedback Pulse Error Counter Reset
Every time the motor rotates for the amount set by Pn329, the internal/external feedback pulse
error is cleared.
This function can be used when there is deviation between the position calculated from
encoder pulses and the position calculated from external encoder due to slipping, etc, and
internal/external feedback pulse errors accumulate.
Precautions for Correct Use
An internal/external feedback pulse error counter overflow level error occurs when the external
encoder is abnormal, connection is wrong, or connection point between the motor and load is
loose, among others. Accordingly, check these items when an error occurs.
Be sure to set an appropriate value for Internal/External Feedback Pulse Error Counter Reset
(Pn329). If an extremely small value is set, this function may not operate.
Use with extra caution on safety by installing limit sensors, etc.
Parameter
number
Parameter name
Explanation
Setting
range
Unit
Pn328
Internal/External
Feedback Pulse
Error Counter
Overflow Level
Set the allowable difference (hybrid error)
between the encoder-detected position
and external encoder-detected position
in the command unit.
1 to 2
27
Command
unit
Pn329
Internal/External
Feedback Pulse
Error Counter
Reset
The hybrid error becomes 0 every time
the motor rotates by the set value. If the
set value is 0, the hybrid error is not
cleared.
0 to 100
Rotation
Amount of internal/external feedback pulse error
[command unit]
Error detection
Pn328 Internal/External Feedback Pulse Error Counter Overflow Level
Pn329
Internal/External Feedback
Pulse Error Counter Reset
Pn329
Internal/External Feedback
Pulse Error Counter Reset
Pn329
Internal/External Feedback
Pulse Error Counter Reset
Number of motor
rotations [rotation]
0 clear
0 clear
