·240·
Installation manual
CNC 8055
CNC 8055i
6.
MACHINE PARAMETERS
SOFT: V02.2X
Axis parameters
If the feedback difference exceeds the value set in axis parameter FBACKDIF (P100) the CNC will
issue the corresponding error message.
MAXDIFAB (P101)
This parameter sets the maximum feedback difference between that of the CNC and the one
indicated by the absolute encoder on power-up.
When using absolute feedback and axis parameter MAXDIFAB (P101)=0, on power-up the CNC
will issue a warning indicating that safety is disabled.
If the position value received from the absolute feedback is not the same as that of the CNC and
it is even greater than the value of axis parameter MAXDIFAB (P101), the CNC will show a error
window on power-up (this window only comes up once in every power-up).
To eliminate this error, select the option "REMOVE ERROR" and press [ENTER]. This way, the axis
will assume the value indicated by the absolute feedback.
If the [EXIT] option is selected or the [ESC] key is pressed, the CNC will show the error message
"Feedback error on the axis" and it will prevent the machine from moving. This error can only be
eliminated by powering the CNC up again and selecting the option "REMOVE ERROR".
Once the error has been removed, if the axis is out of the permitted limits, the CNC will only allow
to move the axes towards the area within the limits.
this error will come up the first time an absolute feedback is connected or when the offsets of the
feedback device are changed. In these cases, once the error has been removed as described earlier,
that error will not come up again.
FBMIXTIM (P102)
Machine parameter that may be used to set the time constant to be used when combining feedbacks;
i.e. it sets the delay between the position values of the first and the second feedback. This parameter
only works for Sercos axes with external feedback, axis parameter DRIBUSLE (P63) =0.
Operation of feedback combination depending on the value of axis parameter FBMIXTIM:
• A value equal to or greater than general parameter LOOPTIME (P72) enables the use of
feedback combination.
• A value smaller than general parameter LOOPTIME (P72) disables feedback combination and
the external feedback will be used.
Activating feedback combination, if it is off on CNC power-up, after setting axis parameter FBMIXTIM
to a value equal to or greater than general parameter LOOPTIME, requires a Shift/Reset or turning
the CNC off and back on.
Once feedback combination is activated on power-up, later changes to the value of parameter
FBMIXTIM, even those involved in turning feedback combination on or off, are validated by simply
pressing Reset or automatically if it was changed from the oscilloscope.
DYNDEFRQ (P103)
Axis parameter DYNDEFRQ (P103) compensates the deformation of the arm that supports the tool
when it is accelerating or decelerating. This parameter is applied in the position loop.
Possible values
Between 0 and 99999.9999 degrees or millimeters.
Between 0 and 3937.00787 inches.
Default value: 1mm (for linear axes)
Default value: 1º (for rotary axes)
Possible values
Between 0 and 9999.9 ms.
Default value: 0
Possible values
Between 0.01 and 9999.99 Hz.
Default value: 0 Hz.
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