Fagor CNC 8055i FL EN - Page 239

Installation manual
CNC 8055
CNC 8055i
MACHINE PARAMETERS
6.
SOFT: V02.2X
·239·
Axis parameters
REVEHYST (P99)
This parameter is used to be able to control when the compensation should really be applied after
detecting a movement reversal and not applying it every time a reversal command is received.
This axis parameter should be set with the value that the position must vary after the first movement
reversal (hysteresis) so it is considered that the command to compensate has been issued, hence
prevent it from issuing the compensations every time it receives the command to reverse the moving
direction if that margin has not been exceeded. The value entered in this parameter must be in mm
for linear axes and in degrees for rotary axes. Default value 0.0000.
Example:
If REVEHYST= 5 dµm, the CNC will not activate the reversal compensation in all the reversals after
the first one as long as the position does not change at least a value equal to the setting of axis
parameter REVEHYST since the first command to reverse the position command was issued.
In other words, if a reversal command is sent when the position command has varied 2 dµm from
the position where the first reversal command took place, it does not issue the compensation (it has
not exceeded the value given by a.mp. REVHYST) and it just reverses the movement.
Only when the position command variation reaches 5 dµm, it will issue the compensation and the
next command to reverse will be taken as the new reference for evaluating the position variation to
determine when it reaches the value given in axis parameter REVEHYST again and it compensates
for it again.
Considerations
• Setting axis parameter REVEHYST (P99) =0, backlash error compensation using a reversal
peak will be applied at every reversal.
• Having set axis parameter REVEHYST (P99) with a value other than 0, to set axis parameter
PEAKDISP (P14) to cut the backlash peak, we recommend to use a smaller REVEHYST value
than that of PEAKDISP so as not to apply the backlash peak.
• If they have been set as DRO axes, the value of axis parameter BACKLASH (P14) will be taken
into account for these axes. In these cases, especially if they have sinusoidal feedback, we
recommend to use a value of axis parameter REVEHYST (P99) other than 0 in order to apply
backlash compensation.
FBACKDIF (P100)
Axis machine parameter that sets the maximum difference allowed between the first and second
feedbacks:
This difference in position values may be monitored on the oscilloscope through the read-only
variable FBDIF(X-C). If the value of FBACKDIF (P100) =0, the feedback difference is not monitored.
It is recommended to set axis parameter FBACKDIF (P100) with a value other than 0.
1
1
P99
P99
P99
P99
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2
3
2
2
1
213
t
Position
Hysteresis amplitude.
Maximum limit given by P99. Issuing the compensation.
Position command reversal.
Compensation cancellation limit.
REVEHYST (P99)
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)