
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63943EN-1/02
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7.1.11.1 Look-ahead acceleration/deceleration before interpolation
Acceleration/deceleration types
There are two types of look-ahead acceleration/deceleration before
interpolation, the linear acceleration/deceleration type and the
bell-shaped acceleration/deceleration type.
Look-ahead bell-shaped acceleration/deceleration before interpolation
produces smoother acceleration/deceleration.
- Setting an acceleration
A permissible acceleration for the linear acceleration/deceleration of
each axis is set in parameter 1660. For bell-shaped
acceleration/deceleration, acceleration change time (B) (period of
transition from constant speed state (A) to constant acceleration/
deceleration state (C)) is set in parameter 1772. In the constant
acceleration/deceleration state (C), acceleration/deceleration is
performed with the maximum tangential acceleration not exceeding
the permissible acceleration of each axis specified in parameter 1660.
The acceleration change time specified in parameter 1772 is held
constant, regardless of the tangential acceleration.
Tangential feedrate
n optimum gradient is
automatically calculated from the
setting made in parameter 1660.
Time set in parameter 1772
(A) (B) (B) (B) (B)(A) (A)(C) (C)
- Method of determining the tangent acceleration
Acceleration/deceleration is performed with the largest tangent
acceleration/deceleration that does not exceed the acceleration set for
each axis.
(Example)
X-axis permissible acceleration: 1000 mm/sec
2
Y-axis permissible acceleration: 1200 mm/sec
2
Acceleration change time: 20 msec