·140·
Installation manual
CNC 8060
CNC 8065
2.
MACHINE PARAMETERS.
(REF: 1402)
Machine parameters for the axes. Work sets.
FFGAIN
Percentage of Feed-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.FFGAIN[set].xn
The CNC only takes this parameter into account when working with feed forward; parameter
FFWTYPE if it is an analog or simulated drive and OPMODEP if it is a Sercos drive. This
parameter should only be used when working with non-linear acceleration and deceleration.
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.
This parameter helps improve the position loop minimizing the amount of following error "ε".
This parameter sets the portion of the velocity command is proportional to the programmed
feedrate and part of it is proportional to the following error "ε".
The best adjustment is obtained when minimizing the amount of following error as much as
possible without reversing its sign, maintaining the moving direction of the axis.
MANFFGAIN
Percentage of Feed-Forward in JOG.
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.MANFFGAIN[set].xn
The CNC only takes this parameter into account when working with feed forward; parameter
FFWTYPE if it is an analog or simulated drive and OPMODEP if it is a Sercos drive.
The scale for the following error of 10 µm per square.
• Proper adjustment with Feed forward.
• Wrong adjustment with Feed forward.
FFGAIN
PROGAIN
Programmed
Feedrate
Nominal
Position
ε
+ +
+
Analog
output
Actual
position
-
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