Installation manual
CNC 8055
CNC 8055i
MACHINE PARAMETERS
6.
SOFT: V02.2X
·247·
Spindle parameters
It is a good idea to also use the acc./dec. axis parameter ACCTIME2 (P18) for this axis (with a value
other than "0") if this gain is to be applied.
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.
FFGAIN (P25)
The CNC takes this parameter into account when operating in closed loop (M19).
Indicates the % of velocity command due to the programmed speed. The rest will depend upon the
following error; both the proportional and derivative gains will be applied onto this following error.
The feed-forward gain improves the position loop minimizing the following error, but it should only
be used when working with acceleration/deceleration.
The best adjustment is achieved when the following error is minimized as much as possible, but
without changing its sign, maintaining the moving direction of the axis.
Possible values
Integer numbers between 0 and 65535.
Default value: 0 (derivative gain not applied)
PROGAIN
DERGAIN
10 t
-----------------------------------
+
=
The graph on the left shows the system response without DERGAIN (10 m per
square) and the one on the right with DERGAIN (1 m per square).
Possible values
Integer numbers between 0 and 100.
Default value: 0 (feed-forward gain not applied)
PROGAIN
·
DERGAIN
10 t
-----------------------------------
FFGAIN Fprog MAXVOLT
100 G00FEED
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++
=
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