Installation manual
CNC 8060
CNC 8065
MACHINE PARAMETERS.
2.
(REF: 1402)
·141·
Machine parameters for the axes. Work sets.
Sometimes, the Feed Forward selected for the automatic mode may be too high for the Jog
mode, when there is no need to control the following error that closely. In those cases,
parameter MANFFGAIN helps adapt the Feed-Forward applied to the jog mode.
An axis that is going to work as an independent axis should have the same feed forward value
in automatic and in jog modes; in other words, parameters FFGAIN and MANFFGAIN should
be the same.
ACFWFACTOR
Acceleration time constant.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drives, velocity-Sercos drives and simulated drives.
Possible values: From 0.001 to 1000000.0000 ms.
Default value: 1000.0000 ms.
Associated variable: (V.)[ch].MPA.ACFWFACTOR[set].xn
The CNC only takes this parameter into account when working with AC-forward; parameter
FFWTYPE if it is an analog or simulated drive and OPMODEP if it is a velocity-Sercos drive.
It is recommended to assign to this parameter a value close to the system's response time.
Since the system response time is usually an unknown value that depends on the inertia of
the machine and on the drive adjustment, it is recommended to try with several values.
The best adjustment is achieved when minimizing the following error as much as possible
but without inverting the peaks. The peaks of the right graph are inverted. Bad adjustment.
ACFGAIN
Percentage of AC-Forward in automatic.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values: from0 to 120 %.
Default value: 0.
Associated variable: (V.)[ch].MPA.ACFGAIN[set].xn
See machine parameter MANACFGAIN.
MANACFGAIN
Percentage of AC-Forward in jog mode.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drives and simulated drives.
Possible values: from0 to 120 %.
Default value: 0.
Associated variable: (V.)[ch].MPA.MANACFGAIN[set].xn
The CNC takes this parameter into account only when working with AC-Forward; parameter
ACFWFACTOR.
An axis that is going to work as an independent axis should have the same AC-forward value
in automatic and in jog modes; in other words, parameters ACFGAIN and MANACFGAIN
should be the same.
These parameters are similar to parameters FFGAIN and MANFFGAIN; but they affect the
AC-Forward. Both parameters improve system response in acceleration changes and
The graph on the left shows the system response without AC-Forward gain (10 µm
per square) and the one on the right with AC-Forward (1 µm per square).
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