Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 185)

Servo Parameters
Chapter 7
7-39
Function
This parameter is significant only if the Servo Position Loop Type is
ZFE Closed Loop. It specifies the percentage that the following error is
reduced as compared to simple Closed--loop operation.
For example, if 80% is entered here, axis following error (after reaching
the commanded feedrate) is approximately 20% of what it would have
been had Closed Loop been selected as the Servo Position Loop Type.
If you enter a value close to: then:
0% axis performance is nearly identical to that of a “Closed
Loop” axis instead of a “ZFE Closed Loop” axis
100% the result is near zero following error when the axis is moving
at a constant velocity
Important: If high percentage values are entered here, careful
consideration must be given to the Gain and Acceleration / Deceleration
parameters to give the axis stability. Refer to chapter 10 for Acc/Dec
parameter information.
ATTENTION: High percentage values entered for this
parameter might impose greater stress on axis components.
Mechanical discontinuities in the machine may be exaggerated.
Life expectancy of some machines may be reduced.
Axis Parameter Number Axis Parameter Number
(1) [1680] (7) [7680]
(2) [2680] (8) [8680]
(3) [3680] (9) [9680]
(4) [4680] (10) [10680]
(5) [5680] (11) [11680]
(6) [6680] (12) [12680]
Range
0 to 100
Notes
This parameter must be set independently for each axis.
7.2.10
Feed Forward Percent