User manual of EL8-EC***F AC Servo
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Position comparison – Offset to origin Pr5.78
When Pr5.77 is triggered, Pr5.80 actual position will automatically be set as Pr5.78
offset value.
Applying position comparison
Output pulse width is set in Pr5.72. Output pulse will be sent once the position comparison
point is crossed and attributes conditions is fulfilled.
When the attribute of position comparison is set to positive crossing, position feedback
becomes larger, position comparison will be enabled; if position feedback becomes smaller, it
indicates negative crossing and position comparison will be disabled.
Diagram below shows position comparison point 1 as positive crossing and position
comparison point 2 as negative crossing. When position comparison point 2 is positively
crossed, position comparison will be disabled.
Position
comparison output
Position comparison
point 1
Position comparison
point 2
Actual position
feedback Pr5.80
Position
Time
Pulse width on positive
crossing
Pulse width on negative
crossing
When multiple position comparison points are set, make sure the travel time between 2
comparison points are larger than the output pulse width as position comparison will be
temporarily disabled during output.
