
4. SERVO FUNCTION DETAILS B-65150E/04
− 142 −
(3) Setting parameters
<1> Set the following parameters in the same way as for conventional
feed-forward control.
#7 #6 #5 #4 #3 #2 #1 #0
1808
−
PIEN
2003
−
PIEN (#3) 1: PI control is selected.
#7 #6 #5 #4 #3 #2 #1 #0
1883
−
FEED
2005
−
FEED (#1) 1: The feed-forward function is enabled.
1962
−
Velocity feed-forward coefficient (VFFLT)
2069
−
[Standard setting] 50 (50 to 200)
<2> Set the coefficient for advanced preview feed-forward control.
1985
−
Advanced preview feed-forward coefficient (ADFF1)
2092
−
Advanced preview feed-forward coefficient (0.01% unit)
= α × 10000 (0 ≤ α ≤ 1)
[Standard setting] 9850
(Example)
When α equals 98.5%, ADFF1 is 9850.
Feed-forward control is configured as shown below:
Deceleration algorithm and function of
acceleration/deceleration before interpolation
of CNC
• Acceleration/deceleration method
causing no figure errors
• Deceleration at a point where a large
impact would be expected
Advanced preview feed-forward function of
digital servo
• Improving the tracking ability of the
servo system
Feed-forward
control