
B-65150E/04 4. SERVO FUNCTION DETAILS
− 179 −
1985
−
Position feed-forward coefficient (in units of 0.01%)
2092
−
[Valid data range] 100 to 10000
(Reference)
Using the linear type and bell-shaped type effectively
The linear time constant and bell-shaped time constant have the
following features:
Linear type:
In rapid traverse, this time constant is used with the CNC
rapid traverse linear time constant. When feed-forward is
applied to perform high-speed positioning, the linear type
requires a shorter operation time and a smaller torque than
the bell-shaped type if the acceleration/deceleration period is
the same.
Bell-shaped:
Stress and strain caused by acceleration/deceleration can be
reduced more effectively than with the linear type.
Therefore, use the linear type and bell-shaped type as follows:
<1> To enable fine acceleration/deceleration, basically use the
linear type function.
<2> Only when the linear type cannot completely eliminate
shocks, use the bell-shaped type to moderate them.
NOTE
• Feed-forward control is enabled by setting bit 1 of No.
1883 (Series 15) or No. 2005 (Series 16) to 1.
• The velocity feed-forward coefficient is set in
parameter No. 1962 (Series 15) or No. 2069 (Series
16) which is the same parameter as that used for
normal operation.
• Generally, the fine acceleration/deceleration function
is enabled in cutting mode only.
• If No. 1800 #3 = 1, the FAD function is enabled both
for cutting and rapid traverse mode.