Programming manual
88
CNC 8070
5.
TECHNOLOGICAL FUNCTIONS
Feedrate related functions
(SOFT V02.0X)
68
5.2.7 Feed-Forward control (G134)
Feed-Forward control may be used to reduce the amount of following
error (axis lag).
Feed-forward may be applied via machine parameters and via PLC
as well as by program. The value defined by PLC will be the one with
the highest priority and the one defined by the machine parameters
will have the lowest priority.
Programming
G134 Percentage of Feed-Forward to be applied
The Feed-Forward percentaje is set by G134 followed by the axes and
the new percentage of Feed-Forward to be applied to each axis.
The Feed-forward values to be applied may be defined with up to two
decimals.
Considerations
The maximum Feed-Forward value to be applied is 120%.
The programmed percentages are absolute, in other words,
programming a 50% twice means that 50% will be applied, not 25%.
The value defined with G134 prevails over those defined in the
machine parameters, but not over the one defined by PLC.
Properties of the functions
Function G134 is modal.
On power-up, after an M02 or M30, EMERGENCY or a RESET, the
CNC restores the Feed-Forward set by the machine manufacturer for
each axis.
G134 X50.75 Y80 Z10 (Percentage of Feed-Forward to be applied:)
(On the X axis = 50.75%)
(On the Y axis = 80%)
(On the Z axis = 10%)
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