
B-63783EN-1/01 7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL
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#7 #6 #5 #4 #3 #2 #1 #0
1517 FCC FNW
[Input type] Parameter input
[Data type] Bit
# 6
# 6 # 6
# 6 FNW
FNWFNW
FNW Specifies whether the method of determining the feedrate based on the
feedrate difference in look-ahead acceleration/deceleration before
interpolation and the method of determining the feedrate based on the
acceleration of fine HPCC are the same as those of the 15B.
0: Same as those of the 15B. Thus, the highest feedrate that does not exceed th
allowable feedrate difference or allowable acceleration for each axis is
assumed.
1: In addition to the condition that the feedrate must not exceed the allowable
feedrate difference and allowable acceleration, the condition that the
deceleration feedrate must be constant if the geometry is the same must be
satisfied in determining the feedrate.
When this parameter is set to 1, the feedrate determined with the feedrate
difference or acceleration may be lower by up to 30% than that determined when it
is set to 0.
# 7
# 7 # 7
# 7 FCC
FCCFCC
FCC If, in look-ahead acceleration/deceleration before interpolation, there is
an axis for which the acceleration time is one second or longer:
0: The specified feedrate may not be attained because the precision is important.
1: The specified feedrate will be attained because the feedrate is important.
NOTE
When this parameter is set to 1, the precision of curve
interpolation such as circular and NURBS interpolation may
reduce.
1635 Time constant for cutting feed acceleration/deceleration after interpolation in
the mode of look-ahead acceleration/deceleration before interpolation
[Input type] Parameter input
[Data type] Integeraxis
[Unit of data] msec
[Valid data range] 0 - 4000
In the mode of look-ahead acceleration/deceleration before interpolation and in
fine HPCC mode, this parameter is used instead of the ordinary time constant
(parameter No. 1622).
Be sure to always set the same time constant in this parameter for all axes, except
for a special application. Otherwise, correct linear or circular figures cannot be
obtained.