
B-65150E/04 4. SERVO FUNCTION DETAILS
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4.8.3 Fine Acceleration/Deceleration (FAD) Function
(1) Overview
The fine acceleration/deceleration function enables smooth
acceleration/deceleration. This is done by using servo software to
perform acceleration/deceleration processing, which previously has
been performed by the CNC. With this function, the mechanical stress
and strain resulting from acceleration/deceleration can be reduced.
(2) Features
• Acceleration/deceleration is controlled by servo software at short
intervals, allowing smooth acceleration/deceleration.
• Smooth acceleration/deceleration 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 acceleration/deceleration command types are supported:
bell-shaped and linear acceleration/deceleration types.
• An application of the fine acceleration/deceleration 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
The fine acceleration/deceleration function (bell-shaped) is supported
in the following:
Series 9066/D(04) and subsequent editions (Series 20, 21, Power
Mate)
Series 9080/D(05) and subsequent editions (Series 15-B, 16-C,
18-C)
Series 9081/C(03) and subsequent editions (Series 15-B, 16-C,
18-C)
Series 9090/C(03) and subsequent editions (Series 16i, 18i, 21i,
Power Mate i)
Series 90A0/A(01) and subsequent editions (Series 15i, 16i, 18i,
21i, Power Mate i)
The cutting/rapid traverse-specific fine acceleration/deceleration
function is supported in the following:
Series 9080/P(16) and subsequent editions (Series 16-C, 18-C)
Series 9090/F(03) and subsequent editions (Series 16i, 18i, 21i)
Series 90A0/A(01) and subsequent editions (Series 15i, 16i, 18i,
21i)