Programming manual.
CNC 8070
TECHNOLOGICAL FUNCTIONS
6.
Feedrate related functions
·109·
(REF: 1709)
6.2.8 AC-Forward control (G135)
AC-Forward control may be used to improve system response in acceleration changes and
reduce the amount of following error (axis lag) on the acceleration and deceleration stages.
AC-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
G135
Percentage of AC-Forward to be applied
The AC-Forward percentaje is set by G135 followed by the axes and the new percentage
of AC-Forward to be applied to each axis.
The AC-forward values to be applied may be defined with up to one decimal.
Considerations
The maximum AC-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 G135 prevails over those defined in the machine parameters, but not
over the one defined by PLC.
Properties of the functions
The G135 function is modal.
On power-up, after an M02 or M30, EMERGENCY or a RESET, the CNC restores the AC-
Forward set by the machine manufacturer for each axis.
Variable to define the AC-forward from the PLC
The write variable (V.)A.PLCACGAIN.Xn may be used to set the AC-forward for each axis
from the PLC. The value defined by this variable prevails over the ones defined by machine
parameters or by program.
Setting this variable with a negative value cancels its effect (a zero value is also valid). This
variable is initialized neither by a reset nor when validating the parameters.
G135 X55.8 Y75 Z110 (Percentage of AC-Forward to be applied:)
(On the X axis = 55.8%)
(On the Y axis = 75%)
(On the Z axis = 110%)
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