Installation manual
CNC 8035
CONCEPTS
Axis adjustment
5.
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·207·
5.5.4 Feed-forward gain setting
With the feed-forward gain, it is possible to reduce the following error without increasing the gain,
thus keeping the system stable.
It sets the percentage of velocity command due to the programmed feedrate; the rest depends on
the proportional and derivative/AC-forward gains.
This gain is only to be used when operating with acceleration/deceleration control.
For example, if a.m.p. FFGAIN (P25) has been set to "80", the axis velocity command will be:
• 80% of it will depend on the programmed feedrate (feed-forward gain).
• 20% of it will depend on the axis following error (proportional gain).
Setting the Feed-Forward gain involves a critical adjustment of a.m.p. MAXVOLT (P37).
1. Move the axis in G00 and at 10%.
2. Measure the actual analog command at the drive.
3. Set parameter MAXVOLT (P37) to a value 10 times the measured value.
For example, If the measured command voltage was 0.945 V, then set this parameter to 9.45
V, in other words: P37=9450.
Next, set a.m.p. FFGAIN (P25) to the desired value.
As an example, the following values may be used:
For slow machining.
between 40 and 60%
For regular feed machining.
between 60 and 80%
Machines (laser, plasma).
between 80 and 100%
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