
B-65270EN/05 APPENDIX D.PARAMETERS RELATED TO HIGH-SPEED AND HIGH-PRECISION OPERATIONS
- 455 -
(5) High-precision contour control
• Parameters that need tuning based on the machine type
Standard setting value
Parameter
No.
Standard
setting
Speed
priority I
Speed
priority II
Description
1432 - - - Maximum cutting feedrate (mm/min) for individual axes
1620 - - -
Time constant (ms) for linear-shaped acc./dec. in rapid-traverse
for individual axes
1621 - - -
Time constant T2 (ms) for bell-shaped acc./dec. in rapid-traverse
for individual axes
1768 24 16 16 Time constant (ms) for acc./dec. after cutting feed interpolation
8400 10000 10000 10000
Maximum cutting feedrate (mm/min) during acc./dec. before
interpolation
8401 240 80 40
Time (ms) allowed before a maximum cutting feedrate during
acc./dec. before interpolation is reached
8410 400 500 1000
Allowable speed difference (mm/min) in acceleration-dependent
on speed difference at corners
8416 64 48 32
Time constant (ms) for bell-shaped acc./dec. before interpolation
(portion with the time fixed)
8470 320 112 56
Parameter (ms) for determining an allowable acceleration in
determining acceleration-dependent speed. The parameter is to
be set with the time allowed before a maximum cutting feedrate
(1432) is reached.
A maximum cutting feedrate of 10000 mm/min is used as the
standard setting value.
• Parameters that do not usually need tuning so often and can be left at fixed
values
Parameter
No.
Standard setting
value
Description
#6,#3
1,0
Acc./dec. after interpolation is of a linear type (if bell-shaped acc./dec. before
interpolation is used)
1602#6,#3
1,1
Acc./dec. after interpolation is of a bell-shaped type (if linear-shaped acc./dec.
before interpolation is used)
1802#7 0/1
To be set to 1 if the CMR setting is 2 or greater (parameter No. 1820 setting is 4
or greater).
7510 -
Largest of controlled-axis numbers for which high precision contour control is
performed
8402#7,#1,
1603#3
1,1
1
Acc./dec. before interpolation is of a bell-shaped type (with the acceleration
change fixed)
8402#4 0 To be set to the standard setting value.
8402#5 1 To be set to the standard setting value.
8403#7,#1,
8404#1,#0
1,1
1,1
No alarm is raised on an M, S, T, B, or rapid traverse command.
Rapid traverse is processed on the RISC side.
8420 180 Number of blocks to be looked ahead (0: 120 blocks)
8451#0 1 To be set to the standard setting value.
8451#4 0/1
Set this parameter to 1 if cutting load-dependent override is to be used.
(This parameter is used if the mechanical rigidity of the Z-axis is low.)
8456 80
Region 2 override (%) for the cutting load-based deceleration function
(needn’t be specified if bit 4 of parameter No. 8451 = 0)