
B-65270EN/05 4.SERVO FUNCTION DETAILS
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4.8.3 Fine Acceleration/Deceleration (FAD) Function
(1) Overview
The fine acceleration/deceleration (fine acc./dec.) function enables
smooth acc./dec. This is done by using servo software to perform
acc./dec. processing, which previously has been performed by the
CNC. With this function, the mechanical stress and strain resulting
from acc./dec. can be reduced.
(2) Features
• Acc./dec. is controlled by servo software at short intervals,
allowing smooth acc./dec.
• Smooth acc./dec. can reduce the stress and strain applied to the
machine.
• Because of the reduced stress and strain on the machine, a shorter
time constant can be set (within the motor acceleration capability
range).
• Two acc./dec. command types are supported: bell-shaped and
linear acc./dec. types.
• An application of the fine acc./dec. function is found in the
cutting and rapid traverse operations; for each operation, the
FAD time constant, feed-forward coefficient, and velocity
feed-forward coefficient can be used separately.
(3) Series and editions of applicable servo software
(Series 15i-B,16i-B,18i-B,21i-B,0i-B,0i Mate-B,Power Mate i)
Series 9096/A(01) and subsequent editions
Series 90B0/A(01) and subsequent editions
Series 90B1/A(01) and subsequent editions
Series 90B6/A(01) and subsequent editions
(Series 0i-C,0i Mate-C,20i-B)
Series 90B5/A(01) and subsequent editions
NOTE
In the Series 30i, 31i, and 32i, smooth acc./dec. is
always performed by nano interpolation, so the fine
acc./dec. function is unnecessary. (The settings for
the function are also ignored.)
(4) Setting basic parameters
#7 #6 #5 #4 #3 #2 #1 #0
1951 (FS15i)
FAD
2007 (FS30i, 16i)
FAD 1: Enables the fine acc./dec. function.
NOTE
To enable this bit setting, the power must be turned
off then back on.