Specifications

AP - 4 Applications Ver. 0002
AP.1.1.2 OTHER 8050/55 CNC PARAMETERS
The analog velocity command at the 8050/55 CNC is adjusted by means of parameters
PROGAIN, FFGAIN, DERGAIN, ACFGAIN, MAXVOLT, MAXVOLT1...4.
PROGAIN (PROportional GAIN) (Parameters: P023 for axes and spindles)
Function: Proportional gain. It is the constant that sets the ratio between the velocity command
and the following error (axis lag). The main component of the Velocity Command is
proportional to the Following error and to this parameter PROGAIN. It must be
adjusted.
Axes: PROGAIN indicates the mV of velocity command desired for a following
error of 1 mm.
Spindle: PROGAIN indicates the mV of velocity command for a following error of 1º.
Only when the spindle is working in M19 mode or Rigid Tapping.
Possible values: 0..65535 mV/mm (1000 mV/mm by default), or in mV/degree for the spindle.
DERGAIN (DERivative GAIN) (Parameters: P024 for the axes and spindles)
Function: Derivative gain. It gives an additional component to the Velocity Command.
Its function depends on the value of another parameter (ACFGAIN):
If ACFGAIN=NO
DERGAIN is the constant that sets the ratio between the Velocity Command and
the variation of the Following Error every 10 milliseconds.
If ACFGAIN=YES
DERGAIN is the constant that sets the ratio between the Velocity Command and
the variation of speed every 10 milliseconds.
If for example ACFGAIN=NO, then:
Axes: DERGAIN indicates the mV of command corresponding to a
variation of following error of 1mm in 10 ms.
Spindle: DERGAIN indicates the mV of command for a change of 1º of
following error in 10 ms. Only when the spindle is working in M19
mode or Rigid Tapping.
Possible values: 0..65535 mV/(mm/10ms) (0 mV/(mm/10ms) by default).
FFGAIN (Feed Forward GAIN) (Parameters: P025 for axes and spindles)
Function: Axes: defines the percentage of additional command due to the programmed
feedrate.
Spindle: defines the percentage of additional command due to the programmed
speed. Only when the spindle is working in M19 mode or Rigid Tapping.
Possible values: 0..100 (0 by default)
ACFGAIN (AC-Forward GAIN) (Parameters: P046 for the axes, P042 for the spindles)
Function: Determines whether the axis machine parameter DERGAIN is applied to the
variations in following error or to the variations of the programmed feedrate. See
DERGAIN function.
Possible values: No: on following error
Yes: on variation of programmed speed
MAXVOLT (MAXimum VOLTage) (Parameter: P037 for the axes)
Function: Indicates the value of the analog voltage of velocity command for G00FEED.
Possible values: 0...9999 mV (9500 mV by default)
On axis drives when working with Sercos interface, this parameter must always be
set to 9500.
MAXVOLTn (MAXimum VOLTage gear n) (Parameters: P037...P040 for n=1...4 at the spindles)
Function: Indicates the value of the analog voltage of velocity command for the maximum
speed of the gear n.
Possible values: 0...9999 mV (9500 mV by default)
These parameters are described in chapters three and four of the installation manual of the
8050/55 CNC.